Backend Engineer • Behavioral • hard

Describe the most complex technical problem you have solved recently. Walk me through your thought process.

#Problem Solving #Architecture #Debugging

Practice

Backend Engineer • Behavioral • easy

Technology changes rapidly. How do you keep up with new backend technologies and frameworks?

#Continuous Learning #Passion for Tech

Practice

Backend Engineer • Behavioral • medium

Tell me about a time you failed or made a significant mistake at work. What happened and what did you learn?

#Growth Mindset #Accountability

Practice

Backend Engineer • Behavioral • medium

Describe a situation where you had to meet a tight, almost impossible deadline. How did you handle it?

#Time Management #Prioritization #Agile

Practice

Backend Engineer • Behavioral • medium

Tell me about a time you had a disagreement or conflict with a team member regarding a technical decision. How did you resolve it?

#Conflict Resolution #Teamwork #Communication

Practice

Backend Engineer • Behavioral • medium

Tell me about a time you had to persuade your team or management to adopt a new technology or technical approach.

#Communication #Influence #Innovation

Practice

Backend Engineer • Coding • easy

Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1.

#Strings #Hash Table

Practice

Backend Engineer • Coding • easy

Given the head of a singly linked list, reverse the list, and return the reversed list.

#Linked List

Practice

Backend Engineer • Coding • medium

Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands.

#Graph #DFS #BFS

Practice

Backend Engineer • Coding • medium

Design a data structure that follows the constraints of a Least Recently Used (LRU) cache.

#Design #Hash Table #Doubly Linked List

Practice

Backend Engineer • Coding • medium

Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals.

#Arrays #Sorting

Practice

Backend Engineer • Coding • easy

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

#Arrays #Hash Table

Practice

Backend Engineer • Coding • easy

Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

#Strings #Stack

Practice

Backend Engineer • Coding • medium

Given a string s, find the length of the longest substring without repeating characters.

#Sliding Window #Strings #Hash Table

Practice

Backend Engineer • Coding • medium

Given an integer array nums and an integer k, return the k most frequent elements.

#Heap #Hash Table #Bucket Sort

Practice

Backend Engineer • System Design • medium

Design a URL Shortener service like Bitly.

#Scalability #Hashing #Databases

Practice

Backend Engineer • System Design • hard

Design an e-commerce checkout API process that ensures a customer is never double-charged, even if network timeouts occur.

#Idempotency #Transactions #Microservices

Practice

Backend Engineer • System Design • hard

How would you design a rate limiter for a public API?

#API Gateway #Algorithms #Redis

Practice

Backend Engineer • System Design • medium

Design a scalable notification system that sends Emails, SMS, and Push Notifications.

#Asynchronous Processing #Message Queues #Microservices

Practice

Backend Engineer • System Design • hard

Design a centralized log aggregation system for a large-scale microservices architecture.

#Logging #Microservices #Message Queues

Practice

Backend Engineer • System Design • hard

Design a highly available distributed cache.

#Caching #Distributed Systems #Consistent Hashing

Practice

Backend Engineer • Technical • medium

How does Spring Boot auto-configuration work under the hood?

#Java #Spring Boot

Practice

Backend Engineer • Technical • medium

What are the SOLID principles of object-oriented design? Provide a practical example of one.

#Object-Oriented Design #SOLID #Clean Code

Practice

Backend Engineer • Technical • hard

Explain the concept of Event-Driven Architecture. How does Apache Kafka fit into this model?

#Kafka #Event-Driven #Microservices

Practice

Backend Engineer • Technical • medium

Explain the concepts of Pods, Deployments, and Services in Kubernetes.

#Kubernetes #Containers #Orchestration

Practice

Backend Engineer • Technical • easy

What is Docker, and how does containerization differ from traditional Virtual Machines?

#Docker #Containers

Practice

Backend Engineer • Technical • medium

How would you secure a public-facing RESTful API?

#REST #Security #OAuth #JWT

Practice

Backend Engineer • Technical • medium

Explain the CAP theorem and how it applies to distributed systems.

#CAP Theorem #Architecture

Practice

Backend Engineer • Technical • medium

What is the difference between Concurrency and Parallelism in Java? How do you implement them?

#Java #Multithreading #Concurrency

Practice

Backend Engineer • Technical • hard

How does Garbage Collection work in Java? Describe the different generations in the heap.

#Java #Memory Management #JVM

Practice

Backend Engineer • Technical • medium

Explain how indexing works in a relational database like DB2 or PostgreSQL. What are the performance trade-offs?

#SQL #Performance #B-Trees

Practice

Backend Engineer • Technical • medium

What is the difference between SQL and NoSQL databases? Provide an example of a use case for each.

#SQL #NoSQL #Data Modeling

Practice

Backend Engineer • Technical • hard

How do you handle transaction management in Spring Boot, and what are the different propagation behaviors?

#Spring #Transactions #SQL

Practice

Backend Engineer • Technical • medium

Explain the architectural differences between a Monolithic application and Microservices. When would you choose one over the other?

#Microservices #Monolith #System Design

Practice

Backend Engineer • Technical • medium

Explain the lifecycle of a Spring Bean from instantiation to destruction.

#Java #Spring

Practice

Cloud Engineer • Behavioral • medium

Tell me about a time you identified an inefficient process and took the initiative to improve it.

#Initiative #Process Improvement #Automation

Practice

Cloud Engineer • Behavioral • medium

Walk me through a time you handled a critical production outage. What was your role and what did you learn?

#Troubleshooting #Under Pressure #Post-mortem

Practice

Cloud Engineer • Behavioral • medium

Describe a situation where you had a technical disagreement with a senior engineer or architect. How did you resolve it?

#Communication #Teamwork

Practice

Cloud Engineer • Behavioral • easy

Tell me about a time you had to learn a new technology or framework very quickly to deliver a project.

#Adaptability #Continuous Learning

Practice

Cloud Engineer • Behavioral • medium

Explain a highly complex technical concept (like Kubernetes networking or Terraform state) to me as if I were a non-technical project manager.

#Communication #Mentoring #Clarity

Practice

Cloud Engineer • Behavioral • medium

Tell me about a time you worked with a difficult or demanding client/stakeholder. How did you ensure their success?

#Client Relations #Empathy #Communication

Practice

Cloud Engineer • Behavioral • easy

Why do you want to work as a Cloud Engineer at IBM specifically, compared to other tech companies?

#Motivation #Company Knowledge

Practice

Cloud Engineer • Behavioral • medium

Describe a time you failed to meet a deadline or deliverable. How did you handle it?

#Failure #Time Management #Integrity

Practice

Cloud Engineer • Coding • easy

Write a function to determine if a string containing just the characters '(', ')', '{', '}', '[' and ']' is valid.

#Strings #Stacks

Practice

Cloud Engineer • Coding • medium

Given an array of characters, compress it in-place. The length after compression must always be smaller than or equal to the original array.

#Two Pointers #Strings

Practice

Cloud Engineer • Coding • medium

Given an m x n 2D binary grid which represents a map of '1's (land) and '0's (water), return the number of islands.

#Graph #DFS #BFS

Practice

Cloud Engineer • Coding • medium

Design and implement a data structure for a Least Recently Used (LRU) cache.

#Hash Table #Doubly Linked List #Design

Practice

Cloud Engineer • Coding • easy

Given an array of integers and an integer target, return indices of the two numbers such that they add up to target. Assume exactly one solution exists.

#Arrays #Hash Table

Practice

Cloud Engineer • Coding • medium

Given an array of intervals where intervals[i] = [start_i, end_i], merge all overlapping intervals and return an array of the non-overlapping intervals.

#Arrays #Sorting

Practice

Cloud Engineer • Coding • medium

Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element.

#Heaps #Quickselect

Practice

Cloud Engineer • System Design • hard

Design a distributed rate limiter for an API Gateway.

#Distributed Systems #API Gateway #Algorithms

Practice

Cloud Engineer • System Design • hard

Design a secure architecture for an application that processes highly sensitive financial data (PCI-DSS compliant).

#Security #Compliance #Architecture

Practice

Cloud Engineer • System Design • medium

A client wants to migrate a monolithic legacy application to a cloud-native architecture. Walk me through your strategy.

#Cloud Migration #Microservices #Strangler Fig

Practice

Cloud Engineer • System Design • medium

How would you design communication between microservices? When would you choose synchronous REST/gRPC vs asynchronous message queues?

#Microservices #Architecture #Messaging

Practice

Cloud Engineer • System Design • hard

Design a scalable log aggregation and search system for a microservices architecture generating 10TB of logs per day.

#Logging #Big Data #Microservices

Practice

Cloud Engineer • System Design • hard

Design a hybrid cloud disaster recovery solution for an on-premises enterprise database.

#Disaster Recovery #Hybrid Cloud #Databases

Practice

Cloud Engineer • System Design • medium

Design a highly available, multi-region web application on IBM Cloud.

#High Availability #Load Balancing #Cloud Architecture

Practice

Cloud Engineer • Technical • medium

Explain the concept of GitOps. How does a tool like ArgoCD or Tekton fit into a modern cloud-native CI/CD pipeline?

#GitOps #CI/CD #Kubernetes

Practice

Cloud Engineer • Technical • medium

How do you optimize a Dockerfile to reduce the final image size and improve security?

#Docker #Security #Optimization

Practice

Cloud Engineer • Technical • medium

Explain the architectural differences between Red Hat OpenShift and upstream Kubernetes. Why would an enterprise client choose OpenShift?

#Kubernetes #OpenShift #Red Hat

Practice

Cloud Engineer • Technical • easy

What is the difference between a Network ACL and a Security Group in a VPC environment?

#VPC #Security #Networking

Practice

Cloud Engineer • Technical • medium

Explain how Prometheus scrapes metrics and how it differs from a push-based monitoring system.

#Prometheus #Monitoring #Metrics

Practice

Cloud Engineer • Technical • medium

Describe the lifecycle of a Kubernetes Pod from creation to termination.

#Kubernetes #Architecture

Practice

Cloud Engineer • Technical • medium

How do you manage Terraform state files in a collaborative team environment, specifically addressing state locking and secrets?

#Terraform #DevOps #Security

Practice

Cloud Engineer • Technical • medium

What is idempotency in the context of Ansible, and how do you ensure your playbooks are idempotent?

#Ansible #Automation

Practice

Cloud Engineer • Technical • easy

Describe the difference between IBM Cloud VPC (Virtual Private Cloud) and Classic Infrastructure.

#IBM Cloud #Networking #VPC

Practice

Cloud Engineer • Technical • medium

How does Role-Based Access Control (RBAC) work in Kubernetes, and how does it integrate with Cloud IAM?

#Kubernetes #IAM #RBAC

Practice

Cloud Engineer • Technical • medium

What are the main differences between Docker and Podman? Why is Podman heavily favored in the Red Hat ecosystem?

#Docker #Podman #Linux

Practice

Cloud Engineer • Technical • medium

In Kubernetes, when would you use a StatefulSet instead of a Deployment?

#Kubernetes #Architecture

Practice

Cloud Engineer • Technical • hard

You log into a Linux server and notice the load average is extremely high, but CPU utilization is low. What could be causing this and how do you troubleshoot it?

#Linux #Troubleshooting #I/O

Practice

Data Engineer • Behavioral • medium

Tell me about a time you disagreed with a senior engineer or manager on an architectural decision.

#Conflict Resolution #Communication #Leadership

Practice

Data Engineer • Behavioral • medium

Tell me about a time you had to explain a complex data engineering concept to a non-technical stakeholder.

#Communication #Stakeholder Management

Practice

Data Engineer • Behavioral • medium

Tell me about a time you missed a project deadline. What happened and what did you learn?

#Accountability #Time Management

Practice

Data Engineer • Behavioral • medium

Describe a situation where you had to work with incomplete or dirty data. How did you handle it?

#Problem Solving #Data Quality

Practice

Data Engineer • Behavioral • easy

Why do you want to work as a Data Engineer at IBM?

#Motivation #Company Knowledge

Practice

Data Engineer • Behavioral • easy

How do you prioritize tasks when you have multiple urgent deadlines?

#Time Management #Agile

Practice

Data Engineer • Behavioral • medium

Describe a time you optimized a slow-running process. What was the impact?

#Performance Tuning #Impact

Practice

Data Engineer • Coding • medium

Write a Python script using Pandas to join two large datasets and handle missing values in the resulting dataframe.

#Python #Pandas #Data Cleaning

Practice

Data Engineer • Coding • medium

Parse a JSON log file in Python and extract specific error codes, returning a count of each error type.

#JSON #Data Parsing #Dictionaries

Practice

Data Engineer • Coding • medium

Write a Python script to merge multiple large CSV files efficiently without loading them entirely into memory.

#File I/O #Generators #Memory Management

Practice

Data Engineer • Coding • easy

Write a Python function to find the first non-repeating character in a string.

#Strings #Hash Maps

Practice

Data Engineer • Coding • medium

How would you delete duplicate rows from a massive table in DB2 or PostgreSQL without creating a new table?

#Data Cleaning #CTID #ROW_NUMBER

Practice

Data Engineer • Coding • medium

Write a SQL query to calculate a 7-day rolling average of daily sales.

#Window Functions #Moving Average #Date Functions

Practice

Data Engineer • Coding • medium

Write a SQL query to find the top 3 highest paid employees in each department.

#Window Functions #DENSE_RANK #PARTITION BY

Practice

Data Engineer • Coding • medium

Write a SQL query to find the cumulative sum of sales by month.

#Window Functions #Cumulative Sum

Practice

Data Engineer • System Design • hard

Design a batch pipeline to ingest 10TB of daily log data into a data lake on IBM Cloud.

#Batch Processing #Data Lake #IBM Cloud Object Storage #Spark

Practice

Data Engineer • System Design • medium

Design a data model for a retail e-commerce platform.

#Data Modeling #Fact Tables #Dimension Tables

Practice

Data Engineer • System Design • medium

Design an idempotent data pipeline. Why is idempotency important?

#Idempotency #Data Pipelines #Fault Tolerance

Practice

Data Engineer • System Design • hard

Design a metric aggregation system that handles late-arriving events in a streaming architecture.

#Streaming #Watermarking #Event Time vs Processing Time

Practice

Data Engineer • System Design • hard

How would you migrate an on-premise DB2 database to a cloud data warehouse with minimal downtime?

#Cloud Migration #CDC #DB2

Practice

Data Engineer • System Design • hard

Design a real-time streaming pipeline for credit card transaction fraud detection.

#Streaming #Kafka #Spark Streaming / Flink #Low Latency

Practice

Data Engineer • Technical • easy

What is the difference between RANK(), DENSE_RANK(), and ROW_NUMBER() in SQL?

#Window Functions #Ranking

Practice

Data Engineer • Technical • medium

Explain how Apache Kafka guarantees message ordering.

#Kafka #Partitions #Message Queues

Practice

Data Engineer • Technical • medium

How do you handle task dependencies and retries in Apache Airflow?

#Airflow #DAGs #Error Handling

Practice

Data Engineer • Technical • hard

What is the Catalyst Optimizer in Spark SQL?

#Spark #Internals #Optimization

Practice

Data Engineer • Technical • easy

Explain the difference between object storage (e.g., IBM Cloud Object Storage/S3) and block storage.

#Storage #Cloud Architecture

Practice

Data Engineer • Technical • medium

What are Parquet and ORC formats? Why are they preferred in Big Data over CSV or JSON?

#File Formats #Storage Optimization

Practice

Data Engineer • Technical • hard

How do you resolve an OutOfMemory (OOM) error in a Spark application?

#Spark #Performance Tuning #Memory Management

Practice

Data Engineer • Technical • medium

Explain how Apache Spark handles fault tolerance.

#Spark #RDD Lineage #DAG

Practice

Data Engineer • Technical • medium

Explain the difference between repartition() and coalesce() in Spark. When would you use each?

#Spark #Data Shuffling #Optimization

Practice

Data Engineer • Technical • hard

What is data skew in Spark, and how do you mitigate it?

#Spark #Data Skew #Salting

Practice

Data Engineer • Technical • medium

Explain the concept of Broadcast Variables and Accumulators in Spark.

#Spark #Shared Variables

Practice

Data Engineer • Technical • easy

Explain the difference between a Star Schema and a Snowflake Schema.

#Data Warehousing #Dimensional Modeling

Practice

Data Engineer • Technical • medium

How do you implement a Slowly Changing Dimension (SCD) Type 2?

#Data Warehousing #SCD #ETL

Practice

Data Engineer • Technical • easy

Explain the difference between ETL and ELT. When would you choose ELT over ETL?

#ETL #ELT #Cloud Data Warehouses

Practice

Data Scientist • Behavioral • medium

Explain a complex technical concept to me as if I were a non-technical executive.

#Communication #Storytelling #Executive Presence

Practice

Data Scientist • Behavioral • easy

IBM values 'Dedication to every client's success'. Can you share an example of how you went above and beyond for a client or internal stakeholder?

#Client Success #IBM Values #Empathy

Practice

Data Scientist • Behavioral • medium

Describe a time when you had conflicting priorities from different managers. How did you handle it?

#Time Management #Conflict Resolution #Prioritization

Practice

Data Scientist • Behavioral • easy

Describe a situation where you had to learn a new technology or framework very quickly to deliver a project.

#Learning #Agile #Adaptability

Practice

Data Scientist • Behavioral • medium

Tell me about a time you had to push back on a stakeholder's request because the data did not support their hypothesis.

#Communication #Stakeholder Management #Integrity

Practice

Data Scientist • Behavioral • medium

Tell me about a time a machine learning model you deployed failed in production. How did you troubleshoot and resolve it?

#Troubleshooting #MLOps #Accountability

Practice

Data Scientist • Behavioral • easy

Tell me about a time you worked on a diverse, cross-functional team to deliver an AI solution. What was your role and how did you ensure collaboration?

#Collaboration #Cross-functional #Agile

Practice

Data Scientist • Coding • hard

Implement a function in Python to calculate the TF-IDF scores for a corpus of documents without using scikit-learn.

#Python #NLP #Math

Practice

Data Scientist • Coding • easy

Given an array of integers, return the indices of the two numbers that add up to a specific target.

#Python #Data Structures #Hash Maps

Practice

Data Scientist • Coding • easy

Write a Python script using pandas to merge two large datasets on a common key, handling missing values by imputing the median.

#Python #Pandas #Data Cleaning

Practice

Data Scientist • Coding • hard

Implement a basic K-Means clustering algorithm from scratch in Python.

#Python #Machine Learning #Math

Practice

Data Scientist • Coding • medium

Write a function to detect anomalies in a time-series array using a moving average and standard deviation threshold.

#Python #Statistics #Time Series

Practice

Data Scientist • Coding • medium

Write a SQL query to find the top 3 highest paid employees in each department.

#SQL #Window Functions #Joins

Practice

Data Scientist • Coding • medium

Calculate the rolling 7-day average of API calls for watsonx endpoints using SQL.

#SQL #Time Series #Window Functions

Practice

Data Scientist • Coding • medium

Write a query to find the churn rate of IBM Cloud customers month-over-month.

#SQL #Aggregations #Business Logic

Practice

Data Scientist • System Design • hard

How would you design a real-time fraud detection system for financial transactions processing 10,000 requests per second?

#Real-time Processing #Fraud Detection #Streaming

Practice

Data Scientist • System Design • hard

Design a recommendation system for IBM Cloud services based on user usage patterns.

#Recommendation Systems #Architecture #Scalability

Practice

Data Scientist • System Design • medium

Design a scalable data pipeline to ingest, clean, and process daily logs from millions of IBM web servers for anomaly detection.

#Data Engineering #Pipelines #Big Data

Practice

Data Scientist • System Design • medium

How would you build a predictive maintenance system for manufacturing equipment using IoT sensor data?

#IoT #Time Series #Predictive Maintenance

Practice

Data Scientist • System Design • hard

Design an architecture to deploy and serve a large language model (LLM) securely for an enterprise client using Red Hat OpenShift.

#LLMOps #Deployment #Security #OpenShift

Practice

Data Scientist • Technical • easy

Describe the difference between bagging and boosting.

#Ensemble Methods #Tree Models

Practice

Data Scientist • Technical • medium

Explain the difference between L1 and L2 regularization. When would you use one over the other in a predictive model?

#Regularization #Linear Models #Feature Selection

Practice

Data Scientist • Technical • medium

How does a Random Forest model handle missing values, and how does it compare to XGBoost in this regard?

#Tree Models #Ensemble Methods #Missing Data

Practice

Data Scientist • Technical • hard

Walk me through the mathematical intuition behind Support Vector Machines (SVM). What is the kernel trick?

#SVM #Math #Algorithms

Practice

Data Scientist • Technical • hard

Explain the architecture of a Transformer model. How does self-attention work in the context of LLMs like watsonx?

#NLP #Transformers #LLMs

Practice

Data Scientist • Technical • easy

What is a p-value? How would you explain it to a non-technical client from IBM Consulting?

#Hypothesis Testing #Communication #Statistics

Practice

Data Scientist • Technical • medium

Explain the assumptions of linear regression. What happens if the assumption of homoscedasticity is violated?

#Linear Regression #Statistics

Practice

Data Scientist • Technical • medium

How do you handle highly imbalanced datasets in a fraud detection model?

#Imbalanced Data #Classification #Fraud Detection

Practice

Data Scientist • Technical • medium

What evaluation metrics would you use for a multi-class classification problem where classes are imbalanced?

#Metrics #Classification

Practice

Data Scientist • Technical • hard

How would you fine-tune an open-source LLM (like Llama-3 or Granite) for a specific enterprise domain using limited data?

#LLMs #Fine-Tuning #NLP #PEFT

Practice

Data Scientist • Technical • easy

Explain the Bias-Variance tradeoff. How do you identify if your model is suffering from high bias or high variance?

#Model Evaluation #Theory

Practice

Data Scientist • Technical • hard

What is the vanishing gradient problem in deep neural networks, and how do LSTMs or ResNets solve it?

#Neural Networks #Optimization #Architecture

Practice

Data Scientist • Technical • medium

Describe A/B testing. How do you determine the sample size needed for an A/B test?

#A/B Testing #Experimentation #Statistics

Practice

Data Scientist • Technical • medium

What is data leakage in machine learning, and how can you prevent it during feature engineering?

#Data Leakage #Feature Engineering #Best Practices

Practice

Data Scientist • Technical • medium

How do you explain a complex black-box model (like a deep neural network) to a business stakeholder?

#XAI #Communication #SHAP #LIME

Practice

DevOps Engineer • Behavioral • medium

Describe a situation where you disagreed with a developer about a deployment strategy. How did you resolve it?

#Communication #Conflict Resolution #DevOps Culture

Practice

DevOps Engineer • Behavioral • easy

DevOps tools evolve rapidly. Tell me about a recent tool or technology you learned on your own and how you applied it to a project.

#Continuous Learning #Adaptability #Innovation

Practice

DevOps Engineer • Behavioral • medium

You have multiple urgent alerts firing from Prometheus, and a developer is asking for help with a broken pipeline. How do you prioritize?

#Prioritization #Incident Management #Time Management

Practice

DevOps Engineer • Behavioral • medium

Tell me about a time you caused a production outage. How did you handle it, and what was the post-mortem process?

#Incident Management #Accountability #Continuous Improvement

Practice

DevOps Engineer • Coding • hard

Given an array of server loads (integers), write a function to distribute the load evenly across two availability zones such that the difference in total load is minimized.

#Algorithms #Dynamic Programming #Optimization

Practice

DevOps Engineer • Coding • easy

Write a Bash script that checks the disk usage of a Linux system and sends an alert to a Slack webhook if usage exceeds 85%.

#Bash #Linux #Monitoring #API

Practice

DevOps Engineer • Coding • medium

Write a Python script to parse a large Nginx access log file and output the top 10 IP addresses with the most 5xx HTTP errors.

#Python #Log Parsing #Data Structures

Practice

DevOps Engineer • Coding • medium

Write a Python function that interacts with the GitHub API to fetch all open pull requests for a specific repository and filters them by a specific label.

#Python #API #GitHub

Practice

DevOps Engineer • Coding • easy

Write a Bash or Python script to extract specific configuration values from a nested JSON file using jq or the json module.

#Bash #Python #JSON #Data Parsing

Practice

DevOps Engineer • System Design • hard

Design a secure CI/CD pipeline using Tekton or Jenkins that builds a container image, scans it for vulnerabilities, and deploys it to an OpenShift cluster.

#Tekton #Jenkins #DevSecOps #OpenShift

Practice

DevOps Engineer • System Design • hard

Design a highly available microservices architecture on IBM Cloud. How do you handle load balancing, database replication, and failover?

#IBM Cloud #High Availability #Microservices #Databases

Practice

DevOps Engineer • System Design • hard

Design a Disaster Recovery (DR) strategy for a stateful application running on Kubernetes. How do you ensure RPO and RTO requirements are met?

#Disaster Recovery #Kubernetes #Storage #Architecture

Practice

DevOps Engineer • System Design • hard

How would you design a deployment pipeline for edge computing devices (e.g., IBM Edge Application Manager) where network connectivity is intermittent?

#Edge Computing #Architecture #Resilience

Practice

DevOps Engineer • System Design • hard

Design a centralized logging architecture for a hybrid cloud environment (on-prem and IBM Cloud). What tools would you use and how would you handle log rotation and retention?

#Logging #Hybrid Cloud #Architecture #ELK

Practice

DevOps Engineer • Technical • medium

What are Jenkins Shared Libraries, and how do they help in scaling CI/CD pipelines across an enterprise?

#Jenkins #Groovy #Scaling

Practice

DevOps Engineer • Technical • medium

How do you handle zero-downtime deployments in Red Hat OpenShift, and what routing strategies would you use?

#OpenShift #Kubernetes #Deployments #Routing

Practice

DevOps Engineer • Technical • easy

Walk me through the steps you take when a Kubernetes pod is stuck in a CrashLoopBackOff state.

#Kubernetes #Debugging #Containers

Practice

DevOps Engineer • Technical • medium

How do you manage Terraform state files securely in a multi-developer environment, specifically when deploying to IBM Cloud or AWS?

#Terraform #Security #State Management

Practice

DevOps Engineer • Technical • hard

Explain how you would write an Ansible playbook to patch 1000 Linux servers with minimal downtime, handling failures gracefully.

#Ansible #Linux #Automation #Scale

Practice

DevOps Engineer • Technical • medium

Explain the difference between an Application Load Balancer (ALB) and a Network Load Balancer (NLB). When would you use each in a Kubernetes environment?

#Load Balancing #Networking #Kubernetes

Practice

DevOps Engineer • Technical • medium

How do you inject secrets into a Kubernetes pod securely without hardcoding them in your deployment YAML?

#Kubernetes #Security #Secrets Management

Practice

DevOps Engineer • Technical • medium

If an application is experiencing high latency, how would you use an APM tool like IBM Instana or Prometheus to identify the bottleneck?

#Monitoring #APM #Instana #Prometheus #Troubleshooting

Practice

DevOps Engineer • Technical • hard

Explain the GitOps workflow. How would you implement ArgoCD to manage deployments across multiple OpenShift clusters?

#GitOps #ArgoCD #OpenShift #Continuous Deployment

Practice

DevOps Engineer • Technical • hard

What happens exactly when you type 'ls -l' in a Linux terminal? Walk me through the system calls.

#Linux #OS Internals #System Calls

Practice

DevOps Engineer • Technical • medium

What are Terraform modules, and how do you version control them to ensure backward compatibility for different teams?

#Terraform #Version Control #Reusability

Practice

DevOps Engineer • Technical • medium

How do you optimize a Dockerfile to reduce the image size and improve build times for a Node.js application?

#Docker #Optimization #Node.js

Practice

DevOps Engineer • Technical • easy

Explain the directory structure of an Ansible Role. What is the purpose of the 'handlers' directory?

#Ansible #Automation

Practice

DevOps Engineer • Technical • medium

Explain how Kubernetes Network Policies work. How would you restrict traffic so that only the frontend namespace can communicate with the backend namespace?

#Kubernetes #Networking #Security

Practice

DevOps Engineer • Technical • easy

A Linux server is unresponsive, but you can still SSH into it. How do you determine what is consuming the system resources?

#Linux #Performance Tuning

Practice

DevOps Engineer • Technical • medium

Explain how IAM (Identity and Access Management) works in a cloud environment. How do you implement the principle of least privilege for a CI/CD service account?

#IAM #Cloud Security #Principle of Least Privilege

Practice

DevOps Engineer • Technical • medium

Explain the difference between a PersistentVolume (PV), a PersistentVolumeClaim (PVC), and a StorageClass in Kubernetes.

#Kubernetes #Storage

Practice

DevOps Engineer • Technical • medium

How do you detect and remediate configuration drift in an environment managed by Terraform?

#Terraform #Configuration Drift #Automation

Practice

DevOps Engineer • Technical • easy

How do you secure sensitive data like passwords or API keys in Ansible?

#Ansible #Security #Secrets Management

Practice

DevOps Engineer • Technical • medium

What are the key differences between upstream Kubernetes and Red Hat OpenShift from a security and operational perspective?

#OpenShift #Kubernetes #Security

Practice

DevOps Engineer • Technical • medium

Define SLI, SLO, and SLA. Give an example of how you would define an SLO for a REST API.

#SRE #SLO #Monitoring

Practice

Frontend Engineer • Behavioral • easy

Why do you want to work at IBM, and how do your skills align with our focus on hybrid cloud and enterprise AI?

#Company Knowledge #Motivation

Practice

Frontend Engineer • Behavioral • medium

Tell me about a time you had to learn a new technology or framework quickly to deliver a project.

#Adaptability #Continuous Learning

Practice

Frontend Engineer • Behavioral • medium

Describe a situation where you disagreed with a senior engineer or designer on a technical approach. How did you resolve it?

#Conflict Resolution #Communication #Teamwork

Practice

Frontend Engineer • Behavioral • medium

Tell me about a time you identified a performance bottleneck in a web application and how you fixed it.

#Performance #Problem Solving #Initiative

Practice

Frontend Engineer • Behavioral • medium

How do you mentor junior developers or contribute to your team's engineering culture?

#Mentorship #Leadership #Collaboration

Practice

Frontend Engineer • Behavioral • medium

Describe a time when you had to deliver a project with rapidly changing requirements.

#Agile #Adaptability #Project Management

Practice

Frontend Engineer • Behavioral • medium

Tell me about a time you advocated for accessibility (a11y) or UX improvements in a project when it wasn't strictly in the requirements.

#Accessibility #Advocacy #User-Centric

Practice

Frontend Engineer • Behavioral • hard

Give an example of the most complex technical problem you solved recently on the frontend.

#Problem Solving #Architecture #Complexity

Practice

Frontend Engineer • Behavioral • easy

How do you prioritize tasks when working on multiple features with tight deadlines?

#Time Management #Prioritization

Practice

Frontend Engineer • Behavioral • medium

Tell me about a time you failed or made a mistake in production. What did you learn?

#Accountability #Growth Mindset

Practice

Frontend Engineer • Coding • easy

Write a function that takes an array of integers and returns indices of the two numbers such that they add up to a specific target.

#Arrays #Hash Maps

Practice

Frontend Engineer • Coding • hard

Implement a custom version of Promise.all().

#Asynchronous Programming #Promises #JavaScript

Practice

Frontend Engineer • Coding • medium

Implement a function to flatten a deeply nested array. Can you do it iteratively as well as recursively?

#JavaScript #Recursion #Arrays

Practice

Frontend Engineer • Coding • medium

Write a function to deep clone a JavaScript object. Assume the object might contain nested objects, arrays, and dates, similar to complex responses from our enterprise APIs.

#JavaScript #Recursion #Data Structures

Practice

Frontend Engineer • Coding • easy

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. This is often used to validate nested JSON structures in our cloud configurations.

#Data Structures #Stacks #Strings

Practice

Frontend Engineer • Coding • medium

Write a JavaScript function to implement a debounce utility. How would you use this to optimize a search input querying an IBM Watson API?

#JavaScript #Performance #Closures

Practice

Frontend Engineer • Coding • medium

Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals. This is used in our calendar and scheduling UI components.

#Arrays #Sorting

Practice

Frontend Engineer • Coding • hard

Design and implement an LRU (Least Recently Used) Cache class in JavaScript. This is useful for caching frontend assets or API responses in a single-page application.

#Data Structures #Hash Maps #Linked Lists

Practice

Frontend Engineer • System Design • hard

Design a frontend dashboard for monitoring IBM Cloud resources in real-time.

#Frontend System Design #WebSockets #Data Visualization

Practice

Frontend Engineer • System Design • medium

Design a file upload widget with progress tracking, chunking, and resume capabilities.

#Frontend System Design #Network #File API

Practice

Frontend Engineer • System Design • medium

How would you architect a frontend application to support dynamic theming using CSS variables, similar to the IBM Carbon Design System?

#CSS #Architecture #Design Systems

Practice

Frontend Engineer • System Design • medium

Design an autocomplete/typeahead search component for IBM Watson documentation.

#Frontend System Design #API Design #UX

Practice

Frontend Engineer • System Design • hard

Design a scalable data grid component for an IBM Cloud billing dashboard that can handle 100,000+ rows of data.

#Frontend System Design #Performance #Virtualization

Practice

Frontend Engineer • Technical • medium

How do you prevent unnecessary re-renders in a React application?

#React #Performance #Memoization

Practice

Frontend Engineer • Technical • easy

Explain Event Delegation in JavaScript. Why is it useful when rendering large lists of data in an enterprise application?

#DOM Manipulation #Events #Performance

Practice

Frontend Engineer • Technical • medium

How does React's Virtual DOM work under the hood? Explain the reconciliation process.

#React #Virtual DOM #Performance

Practice

Frontend Engineer • Technical • medium

Explain closures in JavaScript with a practical example. Where have you used them in your previous projects?

#JavaScript #Closures #Scope

Practice

Frontend Engineer • Technical • easy

What are the differences between 'interface' and 'type' in TypeScript? When would you choose one over the other in an IBM codebase?

#TypeScript #Types #Architecture

Practice

Frontend Engineer • Technical • medium

How do you handle state management in a large-scale React application? Compare Context API, Redux, and Zustand.

#State Management #React #Redux

Practice

Frontend Engineer • Technical • hard

IBM uses micro-frontends heavily to scale enterprise applications across different teams. Explain the concept of Micro-frontends and how you would share state or communicate between them.

#Micro-frontends #Architecture #Module Federation

Practice

Frontend Engineer • Technical • medium

IBM places a heavy emphasis on accessibility (a11y). How do you ensure a React application complies with WCAG 2.1 AA standards?

#Accessibility #WCAG #HTML

Practice

Frontend Engineer • Technical • medium

What is Server-Side Rendering (SSR) vs Client-Side Rendering (CSR)? When would you use Next.js over a standard React SPA?

#SSR #CSR #Next.js #Performance

Practice

Frontend Engineer • Technical • hard

Explain how Webpack works. How would you optimize a Webpack build for a production deployment?

#Webpack #Build Tools #Performance

Practice

Frontend Engineer • Technical • medium

Describe the React component lifecycle and how it translates to React Hooks, specifically useEffect.

#React #Hooks #Lifecycle

Practice

Frontend Engineer • Technical • hard

What are Web Workers and how would you use them to process large datasets in the browser without freezing the UI?

#Web Workers #Performance #Multithreading

Practice

Full Stack Engineer • Behavioral • medium

Tell me about a time you delivered a technical solution that directly impacted client success or improved a business metric.

#Client Success #Impact #Problem Solving

Practice

Full Stack Engineer • Behavioral • easy

Describe a time you had to learn a new technology or framework very quickly to meet a project deadline.

#Continuous Learning #Time Management #Initiative

Practice

Full Stack Engineer • Behavioral • medium

Tell me about a time you had to adapt to a significant change in project requirements late in the development cycle.

#Adaptability #Agile #Communication

Practice

Full Stack Engineer • Behavioral • medium

Describe a situation where you disagreed with a senior engineer or architect's technical decision. How did you handle it?

#Conflict Resolution #Communication #Leadership

Practice

Full Stack Engineer • Behavioral • medium

One of IBM's core values is 'Trust and personal responsibility in all relationships.' Can you share an example of how you embodied this in a past project?

#Core Values #Accountability #Teamwork

Practice

Full Stack Engineer • Coding • easy

Reverse a singly linked list. Provide both iterative and recursive solutions.

#Linked Lists #Recursion

Practice

Full Stack Engineer • Coding • medium

Find the lowest common ancestor (LCA) of two given nodes in a binary tree.

#Trees #Depth-First Search #Recursion

Practice

Full Stack Engineer • Coding • medium

Given an m x n 2D binary grid which represents a map of '1's (land) and '0's (water), return the number of islands.

#Graphs #Depth-First Search #Breadth-First Search

Practice

Full Stack Engineer • Coding • medium

Return a deep copy (clone) of a connected undirected graph.

#Graphs #Hash Table #Depth-First Search

Practice

Full Stack Engineer • Coding • hard

Given two words, beginWord and endWord, and a dictionary wordList, return the number of words in the shortest transformation sequence from beginWord to endWord.

#Graphs #Breadth-First Search

Practice

Full Stack Engineer • Coding • medium

Write a custom React hook (e.g., useFetch) that handles data fetching, loading state, and error handling.

#React #Hooks #JavaScript

Practice

Full Stack Engineer • Coding • easy

Write a SQL query to find the second highest salary from an Employee table.

#Databases #SQL

Practice

Full Stack Engineer • Coding • medium

Find the length of the longest substring without repeating characters.

#Strings #Sliding Window #Hash Set

Practice

Full Stack Engineer • Coding • easy

Write a function to determine if a string containing just the characters '(', ')', '{', '}', '[' and ']' is valid.

#Strings #Stack

Practice

Full Stack Engineer • Coding • medium

Given an array of strings, group the anagrams together. You can return the answer in any order.

#Arrays #Hash Table #Sorting

Practice

Full Stack Engineer • Coding • easy

Given an array of integers and an integer target, return indices of the two numbers such that they add up to target. Optimize for time complexity.

#Arrays #Hash Table

Practice

Full Stack Engineer • Coding • hard

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.

#Arrays #Two Pointers #Dynamic Programming

Practice

Full Stack Engineer • System Design • medium

Design a URL Shortener service (like bit.ly). Focus on the API design and database schema.

#Scalability #API Design #Databases

Practice

Full Stack Engineer • System Design • hard

Design an enterprise chat application similar to Slack or Microsoft Teams.

#WebSockets #Microservices #Databases #Real-time

Practice

Full Stack Engineer • System Design • hard

Design a highly available log aggregation service for IBM Cloud that ingests logs from thousands of microservices.

#Distributed Systems #Kafka #Elasticsearch #Scalability

Practice

Full Stack Engineer • System Design • medium

Design a rate limiter for a public-facing API to prevent abuse.

#Algorithms #Redis #API Design

Practice

Full Stack Engineer • System Design • hard

How would you design a distributed cache system?

#Caching #Distributed Systems #Consistent Hashing

Practice

Full Stack Engineer • Technical • easy

Explain event delegation in JavaScript and why it is useful.

#JavaScript #DOM #Events

Practice

Full Stack Engineer • Technical • medium

Explain the Spring Bean lifecycle and the different bean scopes available in Spring Boot.

#Java #Spring Boot #Architecture

Practice

Full Stack Engineer • Technical • medium

How do you handle transaction management in a Spring Boot application, specifically when dealing with multiple database operations?

#Java #Spring Boot #Databases #Transactions

Practice

Full Stack Engineer • Technical • medium

Explain the Node.js event loop and how it handles asynchronous operations despite being single-threaded.

#Node.js #Architecture #Asynchronous Programming

Practice

Full Stack Engineer • Technical • medium

How would you implement JWT-based authentication in a RESTful API? Discuss security considerations.

#Security #Authentication #REST API

Practice

Full Stack Engineer • Technical • medium

What are the key differences between a monolithic architecture and microservices? When would you choose one over the other?

#Microservices #System Design #Scalability

Practice

Full Stack Engineer • Technical • medium

Explain the difference between clustered and non-clustered indexes in a relational database like DB2 or PostgreSQL.

#Databases #Performance #Indexing

Practice

Full Stack Engineer • Technical • medium

Walk me through how you would containerize a Full Stack application (Node.js backend, React frontend) using Docker.

#Docker #Containers #Deployment

Practice

Full Stack Engineer • Technical • medium

In the context of OpenShift or Kubernetes, explain the difference between a Pod and a Deployment.

#Kubernetes #OpenShift #Cloud

Practice

Full Stack Engineer • Technical • hard

How do you handle database schema migrations in an automated CI/CD pipeline without causing downtime?

#CI/CD #Databases #Zero Downtime

Practice

Full Stack Engineer • Technical • medium

Explain the Virtual DOM in React and how the reconciliation process works.

#React #Architecture #Performance

Practice

Full Stack Engineer • Technical • medium

How do you manage state in a large-scale React enterprise application?

#React #State Management #Redux #Context API

Practice

Full Stack Engineer • Technical • hard

We have an internal IBM dashboard displaying thousands of server logs. How would you optimize the rendering of this large list in React?

#React #Performance #Virtualization

Practice

Machine Learning Engineer • Behavioral • medium

Tell me about a time you had to pivot your technical approach mid-project because of changing client requirements.

#Agile #Client Management

Practice

Machine Learning Engineer • Behavioral • medium

Tell me about a time you had to work with a difficult team member or cross-functional partner to deliver a project.

#Conflict Resolution #Collaboration

Practice

Machine Learning Engineer • Behavioral • easy

Why do you want to work as a Machine Learning Engineer at IBM, and how does our focus on WatsonX and hybrid cloud align with your career goals?

#Company Knowledge #Career Goals

Practice

Machine Learning Engineer • Behavioral • medium

Tell me about a time you had to explain a complex machine learning concept to a non-technical stakeholder or client.

#Stakeholder Management #Communication

Practice

Machine Learning Engineer • Behavioral • medium

Describe a situation where a model you deployed failed or degraded in production. How did you troubleshoot and resolve it?

#Incident Management #Troubleshooting

Practice

Machine Learning Engineer • Behavioral • medium

Describe a project where you had to balance model accuracy with strict inference latency constraints. How did you make the trade-off?

#Trade-offs #Performance Optimization

Practice

Machine Learning Engineer • Behavioral • medium

Tell me about a time you took the initiative to improve an existing ML pipeline, tool, or process without being asked.

#Initiative #Process Improvement

Practice

Machine Learning Engineer • Behavioral • easy

How do you stay updated with the rapidly evolving landscape of Machine Learning, particularly Generative AI?

#Self-Improvement #Industry Trends

Practice

Machine Learning Engineer • Behavioral • medium

Describe a time you identified a potential ethical issue or bias in an AI system. How did you address it?

#Ethics #Responsible AI

Practice

Machine Learning Engineer • Coding • medium

Given an m x n 2D binary grid which represents a map of '1's (land) and '0's (water), return the number of islands.

#Depth-First Search #Breadth-First Search #Matrix

Practice

Machine Learning Engineer • Coding • medium

Design a data structure that follows the constraints of a Least Recently Used (LRU) cache.

#Hash Table #Doubly-Linked List #Design

Practice

Machine Learning Engineer • Coding • medium

Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals.

#Arrays #Sorting

Practice

Machine Learning Engineer • Coding • easy

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

#Strings #Stack

Practice

Machine Learning Engineer • Coding • easy

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

#Arrays #Hash Table

Practice

Machine Learning Engineer • Coding • medium

Given a string s, find the length of the longest substring without repeating characters.

#Strings #Sliding Window

Practice

Machine Learning Engineer • Coding • medium

Given an array of strings strs, group the anagrams together. You can return the answer in any order.

#Strings #Hash Table #Sorting

Practice

Machine Learning Engineer • Coding • medium

Write a Python function using Pandas to fill missing values in a time-series dataset using forward fill, but only up to a limit of 3 consecutive NaNs.

#Python #Pandas #Data Cleaning

Practice

Machine Learning Engineer • Coding • medium

Write a SQL query to find the nth highest salary from an Employee table.

#Database #Window Functions

Practice

Machine Learning Engineer • System Design • hard

Design an end-to-end MLOps pipeline for training, evaluating, and deploying a machine learning model on Red Hat OpenShift.

#Kubernetes #CI/CD #Model Deployment

Practice

Machine Learning Engineer • System Design • hard

Design a scalable recommendation system for IBM Cloud documentation to help developers find relevant tutorials.

#Recommendation Systems #Scalability #Architecture

Practice

Machine Learning Engineer • System Design • hard

Design a system for continuous model training (CT) that automatically retrains a predictive maintenance model when data drift is detected.

#Continuous Training #Model Monitoring #Automation

Practice

Machine Learning Engineer • System Design • hard

How would you architect a serving infrastructure to host a large language model with low latency and high throughput?

#Model Serving #LLMs #Performance Optimization

Practice

Machine Learning Engineer • System Design • hard

Design a scalable enterprise document classification system that uses LLMs to categorize incoming support tickets.

#NLP #LLMs #Enterprise Architecture

Practice

Machine Learning Engineer • System Design • hard

Design a real-time fraud detection system for processing millions of financial transactions per second.

#Real-time Processing #Streaming #Fraud Detection

Practice

Machine Learning Engineer • Technical • medium

Explain the difference between Stochastic Gradient Descent (SGD) and the Adam optimizer.

#Optimization #Neural Networks

Practice

Machine Learning Engineer • Technical • easy

Compare L1 and L2 regularization. When would you choose one over the other?

#Regularization #Linear Models

Practice

Machine Learning Engineer • Technical • easy

Explain the bias-variance tradeoff and how it relates to model complexity.

#Machine Learning Basics #Model Evaluation

Practice

Machine Learning Engineer • Technical • medium

How would you handle a highly imbalanced dataset for a binary classification problem, such as enterprise fraud detection?

#Data Preprocessing #Classification #Imbalanced Data

Practice

Machine Learning Engineer • Technical • hard

Explain the concept of LoRA (Low-Rank Adaptation) and how it reduces the computational cost of fine-tuning LLMs.

#PEFT #LLMs #Fine-tuning

Practice

Machine Learning Engineer • Technical • medium

What is data drift, and how would you detect and mitigate it in a production ML system?

#Model Monitoring #Data Drift #Production ML

Practice

Machine Learning Engineer • Technical • hard

Explain the architecture of a Transformer model. What role does multi-head self-attention play?

#NLP #Transformers #Attention Mechanism

Practice

Machine Learning Engineer • Technical • medium

What are the trade-offs between fine-tuning an open-source LLM (like Llama 3 or Granite) versus using a RAG approach?

#Fine-tuning #RAG #LLMs

Practice

Machine Learning Engineer • Technical • medium

How would you use IBM's AI Fairness 360 (AIF360) toolkit to detect and mitigate bias in a credit scoring model?

#Fairness #Bias Mitigation #IBM Tools

Practice

Machine Learning Engineer • Technical • hard

What metrics would you use to evaluate the quality and safety of a Generative AI model's text output?

#Model Evaluation #LLMs #AI Safety

Practice

Machine Learning Engineer • Technical • medium

How does Retrieval-Augmented Generation (RAG) work, and what are the key components needed to build a RAG pipeline using WatsonX or LangChain?

#RAG #LLMs #Vector Databases

Practice

Product Manager • Behavioral • medium

Describe a situation where you had to influence a cross-functional team (engineering, design, marketing) without direct authority.

#Influence #Cross-functional Collaboration #Leadership

Practice

Product Manager • Behavioral • medium

How do you handle a disagreement with a lead engineer regarding the architecture of a new feature?

#Engineering Relations #Conflict Management #Architecture

Practice

Product Manager • Behavioral • hard

Give an example of an 'innovation that matters'—for your company and for the world—that you drove in a past role.

#IBM Core Values #Innovation #Impact

Practice

Product Manager • Behavioral • medium

What KPIs would you define to evaluate the integration success of an acquired company's software into the IBM ecosystem?

#M&A #Integration #KPIs

Practice

Product Manager • Behavioral • medium

How do you conduct user research for a highly technical product where the end-user is a specialized DevOps engineer?

#Technical Products #DevOps #Customer Discovery

Practice

Product Manager • Behavioral • hard

Walk me through your process for launching a new B2B SaaS product globally.

#GTM Strategy #Global Launch #B2B SaaS

Practice

Product Manager • Behavioral • medium

Pitch IBM Watsonx to a non-technical enterprise client who is skeptical about AI adoption.

#AI #Enterprise B2B #Communication

Practice

Product Manager • Behavioral • hard

How would you decide whether to build a new feature natively in IBM Cloud versus partnering with a third-party vendor?

#Build vs Buy #Cloud Computing #Partnerships

Practice

Product Manager • Behavioral • medium

IBM is considering sunsetting an older analytics tool. How do you manage the transition for enterprise clients who rely heavily on it?

#Sunsetting #Customer Success #Enterprise B2B

Practice

Product Manager • Behavioral • hard

How would you price a new generative AI API service targeted at enterprise developers?

#Pricing Strategy #APIs #Generative AI

Practice

Product Manager • Behavioral • hard

Tell me about a time you identified a new market opportunity by analyzing macro technology trends (e.g., Quantum computing, Edge computing).

#Market Research #Emerging Tech #Vision

Practice

Product Manager • Behavioral • medium

Tell me about a time you received harsh negative feedback from a major enterprise client. How did you handle it?

#Feedback #Client Management #Resilience

Practice

Product Manager • Behavioral • hard

How do you differentiate IBM's AI offerings (Watsonx) from Microsoft Azure's or AWS's in a pitch to a CIO?

#Competitive Strategy #AI #Executive Pitch

Practice

Product Manager • Behavioral • medium

Create a 30-60-90 day plan for taking over an existing, underperforming product line at IBM.

#Onboarding #Turnaround Strategy #Planning

Practice

Product Manager • Behavioral • medium

You have a backlog of 50 features for an enterprise security product. How do you prioritize them?

#Backlog Management #Frameworks #Security

Practice

Product Manager • Behavioral • hard

Engineering says a critical feature for a major Fortune 500 client will take 6 months, but the client's contract renewal requires it in 3 months. What do you do?

#Negotiation #Scope Management #Client Relations

Practice

Product Manager • Behavioral • medium

Tell me about a time you had to pivot your product strategy due to unforeseen technical constraints.

#Adaptability #Technical Constraints #Product Strategy

Practice

Product Manager • Behavioral • medium

How do you balance addressing technical debt with delivering new features in a legacy enterprise product like IBM Z (Mainframe) software?

#Technical Debt #Legacy Systems #Resource Allocation

Practice

Product Manager • Behavioral • easy

Tell me about a time you showed 'dedication to every client's success'—one of IBM's core values.

#IBM Core Values #Customer Success #Empathy

Practice

Product Manager • Behavioral • medium

Tell me about a time you failed to deliver a product on time. What happened, and what did you learn?

#Failure #Retrospectives #Project Management

Practice

Product Manager • Coding • hard

Write a SQL query to calculate the month-over-month retention rate of users on a specific B2B SaaS product.

#Retention #Advanced SQL #Cohort Analysis

Practice

Product Manager • Coding • easy

Write a Python script or pseudocode to parse a JSON log file and count the number of 500 HTTP errors per hour.

#Python #Log Parsing #Data Manipulation

Practice

Product Manager • Coding • medium

Write a SQL query to find the top 5 enterprise clients by monthly recurring revenue (MRR) who have experienced more than 1 hour of downtime in the last 30 days.

#Data Analysis #SQL #Customer Metrics

Practice

Product Manager • System Design • medium

Design a high-level architecture for a B2B dashboard that tracks API usage and billing across hybrid cloud environments.

#Dashboards #API Management #Architecture

Practice

Product Manager • System Design • hard

Design a data pipeline architecture for ingesting real-time IoT data into an IBM Maximo asset management system.

#IoT #Data Pipelines #IBM Maximo

Practice

Product Manager • System Design • hard

Design a system to monitor and alert on anomalies in IBM Cloud infrastructure.

#Monitoring #Infrastructure #Anomaly Detection

Practice

Product Manager • System Design • medium

Design an API for a machine learning model that predicts supply chain disruptions for enterprise clients.

#Machine Learning #Supply Chain #API

Practice

Product Manager • Technical • medium

Explain the concept of 'Event-Driven Architecture' and describe a scenario where you would advocate for it in a product.

#Event-Driven #Microservices #Scalability

Practice

Product Manager • Technical • hard

How do you manage product requirements for a system that must support both on-premise air-gapped environments and public cloud deployments?

#Air-gapped #Hybrid Cloud #Requirements Gathering

Practice

Product Manager • Technical • easy

Explain the difference between a container and a virtual machine to a business stakeholder, and explain why Red Hat OpenShift is a strategic advantage.

#Containers #Virtualization #Technical Communication

Practice

Product Manager • Technical • medium

What metrics would you track to measure the success of a new developer portal for IBM Watson APIs?

#Developer Experience #APIs #KPIs

Practice

Product Manager • Technical • medium

How do you ensure data privacy and compliance (e.g., GDPR, HIPAA) when building an AI-driven healthcare product at IBM?

#Data Privacy #Healthcare #AI Ethics

Practice

Product Manager • Technical • hard

How do you use A/B testing in a B2B enterprise environment where user traffic is significantly lower compared to B2C?

#A/B Testing #B2B #Statistical Significance

Practice

Product Manager • Technical • medium

A key metric for IBM Cloud adoption dropped by 15% week-over-week. Walk me through how you investigate the root cause.

#Data Analysis #Problem Solving #Cloud Metrics

Practice

Product Manager • Technical • hard

Design a product roadmap for migrating a legacy on-premise banking client to a hybrid cloud architecture using Red Hat OpenShift.

#Hybrid Cloud #Roadmapping #Red Hat OpenShift

Practice

Software Engineer • Behavioral • medium

Tell me about a time you proactively identified a security vulnerability or a severe performance bottleneck in your team's application. What steps did you take?

#Proactivity #Security #Performance

Practice

Software Engineer • Behavioral • medium

Describe a time when a project you were working on failed or missed a critical deadline. What went wrong and what did you learn from the experience?

#Accountability #Resilience #Retrospectives

Practice

Software Engineer • Behavioral • easy

How do you prioritize your tasks when you have multiple urgent deadlines competing for your time across different projects?

#Time Management #Prioritization #Agile

Practice

Software Engineer • Behavioral • easy

Why do you want to work for IBM, and how do you see technologies like Hybrid Cloud and AI shaping the future of enterprise software?

#Company Knowledge #Industry Trends #Motivation

Practice

Software Engineer • Behavioral • medium

Describe your experience working in a geographically distributed Agile team. How do you handle communication barriers and time zone differences?

#Remote Work #Communication #Agile

Practice

Software Engineer • Behavioral • medium

Tell me about a time you had to quickly learn a new technology or framework to complete a project on time.

#Adaptability #Continuous Learning

Practice

Software Engineer • Behavioral • medium

Describe a situation where you disagreed with a senior engineer or manager on a technical design. How did you handle it and what was the outcome?

#Conflict Resolution #Communication #Technical Leadership

Practice

Software Engineer • Behavioral • medium

IBM values 'dedication to every client's success'. Can you share an example of when you went above and beyond to solve a critical problem for a customer or end-user?

#Customer Focus #Problem Solving #Empathy

Practice

Software Engineer • Behavioral • medium

Tell me about a time you had to work with a large, undocumented legacy codebase. How did you ensure you didn't break existing functionality while adding new features?

#Legacy Code #Testing #Risk Management

Practice

Software Engineer • Coding • medium

Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.

#Stack #Design

Practice

Software Engineer • Coding • easy

Given a string of lowercase English letters, find the first non-repeating character in it and return its index. If it does not exist, return -1.

#Strings #Hash Table #Counting

Practice

Software Engineer • Coding • medium

Design and implement a data structure for a Least Recently Used (LRU) cache. It should support get and put operations in O(1) time complexity.

#Hash Table #Doubly Linked List #Design

Practice

Software Engineer • Coding • easy

Given the head of a singly linked list, reverse the list, and return the reversed list.

#Linked List #Pointers

Practice

Software Engineer • Coding • medium

Given an m x n 2D binary grid representing a map of '1's (land) and '0's (water), return the number of islands. An island is surrounded by water and formed by connecting adjacent lands horizontally or vertically.

#Graph #DFS #BFS

Practice

Software Engineer • Coding • hard

Given a network of IBM Cloud data centers represented as nodes and the cost to lay fiber optic cables between them as weighted edges, find the minimum cost to connect all data centers.

#Graph #Minimum Spanning Tree #Union Find

Practice

Software Engineer • Coding • easy

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

#Strings #Stack

Practice

Software Engineer • Coding • easy

Given an array of integers and an integer target, return indices of the two numbers such that they add up to target. Assume exactly one solution exists.

#Arrays #Hash Table

Practice

Software Engineer • Coding • hard

Given two words, beginWord and endWord, and a dictionary wordList, return the number of words in the shortest transformation sequence from beginWord to endWord.

#Graph #BFS #Strings

Practice

Software Engineer • Coding • medium

Given a string representing a stream of log characters, find the length of the longest substring without repeating characters.

#Strings #Sliding Window #Hash Table

Practice

Software Engineer • Coding • medium

There are a total of numCourses courses you have to take. You are given an array prerequisites where prerequisites[i] = [a_i, b_i] indicates that you must take course b_i first if you want to take course a_i. Return true if you can finish all courses.

#Graph #Topological Sort #Cycle Detection

Practice

Software Engineer • Coding • medium

Given an array of intervals representing server downtime, merge all overlapping intervals and return an array of the non-overlapping intervals.

#Arrays #Sorting

Practice

Software Engineer • System Design • hard

Design a scalable log aggregation system (similar to Splunk or the ELK stack) that can ingest, index, and query terabytes of logs daily from thousands of IBM microservices.

#Log Aggregation #Kafka #Elasticsearch #Big Data

Practice

Software Engineer • System Design • hard

Design a highly available hybrid cloud storage service that synchronizes on-premise enterprise data with IBM Cloud Object Storage.

#Hybrid Cloud #Data Synchronization #High Availability #Storage

Practice

Software Engineer • System Design • medium

Design a distributed rate limiter for an enterprise API gateway to prevent abuse and enforce client-specific quotas.

#Rate Limiting #API Gateway #Redis

Practice

Software Engineer • System Design • medium

Design a real-time AI inference pipeline that takes user text, processes it via Watson NLP models, and returns sentiment analysis to a web client.

#AI/ML Pipelines #WebSockets #Microservices #Load Balancing

Practice

Software Engineer • System Design • hard

Design a distributed message queue system similar to Apache Kafka or IBM MQ.

#Distributed Systems #Message Queue #Storage #Concurrency

Practice

Software Engineer • System Design • easy

Design a URL shortener service like Bitly.

#Hashing #Database #Caching #Load Balancing

Practice

Software Engineer • Technical • medium

Explain the architectural differences between Docker and Kubernetes. Furthermore, how does Red Hat OpenShift add enterprise value on top of standard Kubernetes?

#Docker #Kubernetes #Red Hat OpenShift #Containers

Practice

Software Engineer • Technical • hard

How does Garbage Collection work in Java? If an IBM microservice is experiencing high latency spikes due to 'Stop-the-World' pauses, how would you diagnose and tune it?

#Java #JVM #Garbage Collection #Performance Tuning

Practice

Software Engineer • Technical • easy

In Java 8 and later, what are the practical differences between an Abstract Class and an Interface? When would you choose one over the other?

#Java #Object-Oriented Programming

Practice

Software Engineer • Technical • medium

Explain the OAuth 2.0 authorization code flow. How would you secure a public-facing API gateway using OAuth?

#OAuth 2.0 #Authentication #API Gateway

Practice

Software Engineer • Technical • medium

What are the core differences between REST and GraphQL? In an enterprise environment, when would you advocate for using GraphQL?

#REST #GraphQL #Web Services

Practice

Software Engineer • Technical • medium

Walk me through setting up a CI/CD pipeline for a containerized application deploying to IBM Cloud. What tools and stages would you include?

#CI/CD #Jenkins #Tekton #IBM Cloud

Practice

Software Engineer • Technical • hard

How do you handle distributed transaction management across multiple microservices? Explain the Saga pattern.

#Microservices #Distributed Transactions #Saga Pattern

Practice

Software Engineer • Technical • medium

Explain the CAP theorem. How does it apply when choosing between a relational database like IBM DB2 and a NoSQL database like Cassandra for a globally distributed application?

#Distributed Systems #CAP Theorem #SQL vs NoSQL

Practice

IBM

The Interview Loop

Recruiter Screen (30 min)

Technical Loop (3-4 Rounds)

Interview Question Bank

Describe the most complex technical problem you have solved recently. Walk me through your thought process.

Technology changes rapidly. How do you keep up with new backend technologies and frameworks?

Tell me about a time you failed or made a significant mistake at work. What happened and what did you learn?

Describe a situation where you had to meet a tight, almost impossible deadline. How did you handle it?

Tell me about a time you had a disagreement or conflict with a team member regarding a technical decision. How did you resolve it?

Tell me about a time you had to persuade your team or management to adopt a new technology or technical approach.

Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1.

Given the head of a singly linked list, reverse the list, and return the reversed list.

Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands.

Design a data structure that follows the constraints of a Least Recently Used (LRU) cache.

Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals.

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

Given a string s, find the length of the longest substring without repeating characters.

Given an integer array nums and an integer k, return the k most frequent elements.

Design a URL Shortener service like Bitly.

Design an e-commerce checkout API process that ensures a customer is never double-charged, even if network timeouts occur.

How would you design a rate limiter for a public API?

Design a scalable notification system that sends Emails, SMS, and Push Notifications.

Design a centralized log aggregation system for a large-scale microservices architecture.

Design a highly available distributed cache.

How does Spring Boot auto-configuration work under the hood?

What are the SOLID principles of object-oriented design? Provide a practical example of one.

Explain the concept of Event-Driven Architecture. How does Apache Kafka fit into this model?

Explain the concepts of Pods, Deployments, and Services in Kubernetes.

What is Docker, and how does containerization differ from traditional Virtual Machines?

How would you secure a public-facing RESTful API?

Explain the CAP theorem and how it applies to distributed systems.

What is the difference between Concurrency and Parallelism in Java? How do you implement them?

How does Garbage Collection work in Java? Describe the different generations in the heap.

Explain how indexing works in a relational database like DB2 or PostgreSQL. What are the performance trade-offs?

What is the difference between SQL and NoSQL databases? Provide an example of a use case for each.

How do you handle transaction management in Spring Boot, and what are the different propagation behaviors?

Explain the architectural differences between a Monolithic application and Microservices. When would you choose one over the other?

Explain the lifecycle of a Spring Bean from instantiation to destruction.

Tell me about a time you identified an inefficient process and took the initiative to improve it.

Walk me through a time you handled a critical production outage. What was your role and what did you learn?

Describe a situation where you had a technical disagreement with a senior engineer or architect. How did you resolve it?

Tell me about a time you had to learn a new technology or framework very quickly to deliver a project.

Explain a highly complex technical concept (like Kubernetes networking or Terraform state) to me as if I were a non-technical project manager.

Tell me about a time you worked with a difficult or demanding client/stakeholder. How did you ensure their success?

Why do you want to work as a Cloud Engineer at IBM specifically, compared to other tech companies?

Describe a time you failed to meet a deadline or deliverable. How did you handle it?

Write a function to determine if a string containing just the characters '(', ')', '{', '}', '[' and ']' is valid.

Given an array of characters, compress it in-place. The length after compression must always be smaller than or equal to the original array.

Given an m x n 2D binary grid which represents a map of '1's (land) and '0's (water), return the number of islands.

Design and implement a data structure for a Least Recently Used (LRU) cache.

Given an array of integers and an integer target, return indices of the two numbers such that they add up to target. Assume exactly one solution exists.

Given an array of intervals where intervals[i] = [start_i, end_i], merge all overlapping intervals and return an array of the non-overlapping intervals.

Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element.

Design a distributed rate limiter for an API Gateway.

Design a secure architecture for an application that processes highly sensitive financial data (PCI-DSS compliant).

A client wants to migrate a monolithic legacy application to a cloud-native architecture. Walk me through your strategy.

How would you design communication between microservices? When would you choose synchronous REST/gRPC vs asynchronous message queues?

Design a scalable log aggregation and search system for a microservices architecture generating 10TB of logs per day.

Design a hybrid cloud disaster recovery solution for an on-premises enterprise database.

Design a highly available, multi-region web application on IBM Cloud.

Explain the concept of GitOps. How does a tool like ArgoCD or Tekton fit into a modern cloud-native CI/CD pipeline?

How do you optimize a Dockerfile to reduce the final image size and improve security?

Explain the architectural differences between Red Hat OpenShift and upstream Kubernetes. Why would an enterprise client choose OpenShift?

What is the difference between a Network ACL and a Security Group in a VPC environment?

Explain how Prometheus scrapes metrics and how it differs from a push-based monitoring system.

Describe the lifecycle of a Kubernetes Pod from creation to termination.

How do you manage Terraform state files in a collaborative team environment, specifically addressing state locking and secrets?

What is idempotency in the context of Ansible, and how do you ensure your playbooks are idempotent?

Describe the difference between IBM Cloud VPC (Virtual Private Cloud) and Classic Infrastructure.

How does Role-Based Access Control (RBAC) work in Kubernetes, and how does it integrate with Cloud IAM?

What are the main differences between Docker and Podman? Why is Podman heavily favored in the Red Hat ecosystem?

In Kubernetes, when would you use a StatefulSet instead of a Deployment?

You log into a Linux server and notice the load average is extremely high, but CPU utilization is low. What could be causing this and how do you troubleshoot it?

Tell me about a time you disagreed with a senior engineer or manager on an architectural decision.

Tell me about a time you had to explain a complex data engineering concept to a non-technical stakeholder.

Tell me about a time you missed a project deadline. What happened and what did you learn?

Describe a situation where you had to work with incomplete or dirty data. How did you handle it?

Why do you want to work as a Data Engineer at IBM?