Cloud Engineer • Behavioral • easy

How would you explain the concept of 'Infrastructure as Code' (IaC) to a non-technical project manager who is concerned about project timelines?

#Communication #IaC #Stakeholder Management

Practice

Cloud Engineer • Behavioral • medium

Tell me about a time you disagreed with a client or a senior architect regarding a cloud migration strategy. How did you handle it?

#Communication #Conflict Resolution #Client Management

Practice

Cloud Engineer • Behavioral • medium

Tell me about a time you had to learn a completely new cloud technology or tool under a very tight project deadline.

#Adaptability #Continuous Learning #Time Management

Practice

Cloud Engineer • Behavioral • medium

Describe a time when a critical production system went down under your watch. What was your immediate reaction, and how did you resolve it?

#Incident Management #Accountability #Problem Solving

Practice

Cloud Engineer • Coding • hard

Write a Python script that traverses a given directory, finds all duplicate files based on their MD5 hash, and prints their paths.

#Python #File System #Hashing

Practice

Cloud Engineer • Coding • medium

Write a Python function that makes a GET request to a REST API, handles pagination, and returns a consolidated list of all items.

#Python #API #Requests

Practice

Cloud Engineer • Coding • medium

Write a Bash script that parses an Nginx access log file, counts the number of HTTP 500 errors, and outputs the top 5 IP addresses generating these errors.

#Bash #Linux #Log Analysis

Practice

Cloud Engineer • Coding • medium

Write a Python script using Boto3 to find and delete all unattached EBS volumes in a specific AWS region to optimize client costs.

#Python #Boto3 #AWS #Cost Optimization

Practice

Cloud Engineer • System Design • hard

A client wants to migrate a monolithic legacy telecom billing system to a microservices architecture on Kubernetes. How would you approach this system design?

#Microservices #Kubernetes #Migration #Strangler Pattern

Practice

Cloud Engineer • System Design • medium

Design a highly available and fault-tolerant 3-tier web architecture on AWS for a telecom client experiencing variable traffic.

#AWS #Architecture #High Availability #Auto Scaling

Practice

Cloud Engineer • System Design • medium

Design a serverless architecture for a web application that allows users to upload images, processes them to create thumbnails, and serves them globally.

#Serverless #AWS #Architecture

Practice

Cloud Engineer • System Design • hard

Design a Disaster Recovery (DR) strategy for a mission-critical financial application. Define RTO and RPO in your answer.

#Disaster Recovery #Architecture #High Availability

Practice

Cloud Engineer • System Design • hard

How would you design a database migration strategy from an on-premises SQL Server to AWS RDS with near-zero downtime?

#Database #Migration #AWS DMS

Practice

Cloud Engineer • System Design • hard

Design a scalable log ingestion and analytics platform for a global enterprise generating 5TB of logs daily.

#Big Data #Logging #Elasticsearch #Kafka

Practice

Cloud Engineer • Technical • medium

Explain the DRY principle in the context of Terraform. How do you implement it?

#Terraform #IaC #Best Practices

Practice

Cloud Engineer • Technical • medium

You are alerted that a Linux VM in Azure is running at 100% CPU. What commands do you run to identify the root cause?

#Linux #Troubleshooting #Performance

Practice

Cloud Engineer • Technical • easy

Compare AWS CloudFormation and Terraform. Why might a company choose Terraform over CloudFormation?

#Terraform #CloudFormation #IaC

Practice

Cloud Engineer • Technical • medium

Explain how Prometheus and Grafana work together in a Kubernetes environment. How does Prometheus discover targets?

#Monitoring #Prometheus #Grafana #Kubernetes

Practice

Cloud Engineer • Technical • hard

A client needs a secure, highly available connection between their corporate data center and an Azure VNet. Walk me through setting up an Azure VPN Gateway.

#Azure #Networking #VPN

Practice

Cloud Engineer • Technical • medium

What are Azure Resource Manager (ARM) templates, and how do they compare to Azure Bicep?

#Azure #IaC #ARM #Bicep

Practice

Cloud Engineer • Technical • medium

When would you choose AWS ECS over AWS EKS for container orchestration?

#AWS #Containers #ECS #EKS

Practice

Cloud Engineer • Technical • medium

What are the key considerations and steps when Dockerizing a legacy stateful application?

#Docker #Containerization #Legacy Systems

Practice

Cloud Engineer • Technical • medium

How do you manage and secure Terraform state files in a collaborative team environment?

#Terraform #State Management #Security

Practice

Cloud Engineer • Technical • medium

A client wants to connect multiple AWS VPCs across different regions and their on-premises data center. Would you use VPC Peering or AWS Transit Gateway, and why?

#AWS #VPC #Transit Gateway #Hybrid Cloud

Practice

Cloud Engineer • Technical • medium

One of your Kubernetes pods is stuck in a CrashLoopBackOff state. Walk me through your step-by-step troubleshooting process.

#Kubernetes #Troubleshooting #Containers

Practice

Cloud Engineer • Technical • easy

Explain the different Amazon S3 storage classes. How would you design a lifecycle policy for a client's compliance logs that must be kept for 7 years but are rarely accessed after 30 days?

#AWS #S3 #Storage #Cost Optimization

Practice

Cloud Engineer • Technical • hard

How would you integrate an on-premises Active Directory with Azure Active Directory (Entra ID) for a seamless SSO experience?

#Azure #Active Directory #Identity Management #SSO

Practice

Cloud Engineer • Technical • medium

Explain how you would set up a CI/CD pipeline in Jenkins to build, test, and deploy a Dockerized Node.js application to AWS ECS.

#Jenkins #CI/CD #Docker #AWS ECS

Practice

Cloud Engineer • Technical • easy

What is the difference between an IAM Role and an IAM Policy in AWS? When would you use a Role instead of an IAM User?

#AWS #IAM #Security

Practice

Cloud Engineer • Technical • medium

You receive an alert that an Application Load Balancer (ALB) is returning 502 Bad Gateway errors. What are the potential causes and how do you fix them?

#AWS #ALB #Troubleshooting #Networking

Practice

Cloud Engineer • Technical • medium

Compare Blue-Green deployments with Canary deployments. In what scenario would you recommend one over the other to a client?

#CI/CD #Deployment Strategies

Practice

Cloud Engineer • Technical • medium

How do you secure a public-facing REST API hosted on AWS API Gateway and Lambda?

#AWS API Gateway #AWS Lambda #Security #WAF

Practice

Cloud Engineer • Technical • medium

What are AWS Lambda 'cold starts', and what strategies would you use to mitigate them in a latency-sensitive application?

#AWS Lambda #Serverless #Performance

Practice

Cloud Engineer • Technical • easy

Explain the differences between ClusterIP, NodePort, and LoadBalancer service types in Kubernetes.

#Kubernetes #Networking

Practice

Cloud Engineer • Technical • medium

How do you securely manage secrets (like database passwords or API keys) in a CI/CD pipeline and runtime environment?

#DevSecOps #Secrets Management #CI/CD

Practice

Data Engineer • Behavioral • easy

Working at an IT services company often means handling multiple client deliverables at once. How do you prioritize your tasks?

#Time Management #Prioritization

Practice

Data Engineer • Behavioral • medium

Explain the concept of 'Data Partitioning' to a non-technical business stakeholder.

#Communication #Mentoring

Practice

Data Engineer • Behavioral • hard

Describe the most challenging bug you have faced in a production data pipeline. How did you troubleshoot and resolve it?

#Troubleshooting #Experience

Practice

Data Engineer • Behavioral • medium

How do you handle a situation where the upstream source system changes its data format (e.g., adding/removing columns) without notifying the data engineering team?

#Problem Solving #Resilience

Practice

Data Engineer • Behavioral • medium

Tell me about a time you had to push back on a client or stakeholder who demanded an unrealistic deadline for a data delivery.

#Stakeholder Management #Communication

Practice

Data Engineer • Coding • easy

Write a Python function to find the first non-repeating character in a given string. Optimize it for time complexity.

#Strings #Hash Maps

Practice

Data Engineer • Coding • medium

You need to extract data from a third-party REST API for a client project. The API limits responses to 100 records per request. Write a Python snippet to handle pagination and extract all records.

#API Integration #Pagination #Requests Library

Practice

Data Engineer • Coding • easy

Given a list of dictionaries representing employee data (id, name, department), write Python code to group the employees by department.

#Data Manipulation #Dictionaries #Collections

Practice

Data Engineer • Coding • easy

Write a Python script to connect to an AWS S3 bucket, list all files with a '.json' extension, and print their sizes.

#Boto3 #AWS #Scripting

Practice

Data Engineer • Coding • hard

Write a PySpark snippet to merge new incoming data into an existing Delta Lake table, updating existing records and inserting new ones (Upsert).

#Delta Lake #PySpark #Upserts

Practice

Data Engineer • Coding • medium

Write a SQL query to pivot a table containing 'Year', 'Month', and 'Revenue' so that each Month becomes a column with the corresponding Revenue.

#Pivot #Data Transformation

Practice

Data Engineer • Coding • medium

Given a table of Telecom Call Detail Records (CDRs), write a SQL query to calculate the rolling 7-day cumulative data usage for each specific user.

#Window Functions #Time Series #Data Aggregation

Practice

Data Engineer • Coding • medium

How do you find and delete duplicate records in a massive SQL table without creating a temporary table?

#Data Cleansing #CTEs #DELETE Statements

Practice

Data Engineer • Coding • medium

Write a Python script using Pandas or PySpark to read a 10GB CSV file, drop rows where the 'customer_id' is null, and write the output partitioned by 'region' into Parquet format.

#Data I/O #Data Cleaning #Partitioning

Practice

Data Engineer • Coding • medium

Write a SQL query to find the 3rd highest salary from an Employee table without using the LIMIT keyword.

#Subqueries #Correlated Queries #Window Functions

Practice

Data Engineer • System Design • medium

Design an ETL pipeline on AWS to ingest daily Call Detail Records (CDRs) from an SFTP server, transform them, and load them into Redshift for reporting.

#AWS #ETL Architecture #Data Warehousing

Practice

Data Engineer • System Design • hard

Design a real-time streaming pipeline to process IoT sensor data from manufacturing plants, detect anomalies, and store the results.

#Streaming #Kafka #Spark Streaming #NoSQL

Practice

Data Engineer • System Design • hard

A healthcare client wants to move from a traditional data warehouse to a Data Lakehouse architecture. How would you design this using Databricks?

#Data Lakehouse #Databricks #Medallion Architecture

Practice

Data Engineer • System Design • hard

Design a batch processing pipeline to ingest 500GB of transactional data daily. How do you handle incremental loads?

#Batch Processing #Incremental Load #Architecture

Practice

Data Engineer • Technical • hard

A client complains that a critical reporting query taking data from a 50-million row table is running too slow. Walk me through your step-by-step approach to optimize it.

#Query Optimization #Indexing #Execution Plans

Practice

Data Engineer • Technical • medium

How do you schedule and monitor your data pipelines? Explain the core components of Apache Airflow.

#Airflow #Orchestration

Practice

Data Engineer • Technical • easy

In PySpark, what is the difference between repartition() and coalesce()? When should you use which?

#PySpark #Partitioning

Practice

Data Engineer • Technical • medium

What is 'Idempotency' in the context of data engineering? Why is it critical for data pipelines?

#Pipeline Design #Reliability

Practice

Data Engineer • Technical • easy

Explain your Git workflow for deploying data engineering code across Development, QA, and Production environments.

#CI/CD #Version Control

Practice

Data Engineer • Technical • easy

Explain the difference between ROW_NUMBER(), RANK(), and DENSE_RANK(). Provide a scenario where you would specifically choose DENSE_RANK() over RANK().

#Window Functions #Data Ranking

Practice

Data Engineer • Technical • medium

How do you ensure data quality and integrity in your ETL pipelines? What specific checks do you automate?

#Data Validation #Testing

Practice

Data Engineer • Technical • medium

Explain the internal architecture of Apache Spark. What happens under the hood when you submit a Spark job?

#Spark Architecture #Driver #Executors #Cluster Manager

Practice

Data Engineer • Technical • hard

During a data migration project, your PySpark job is running extremely slow and some tasks are taking much longer than others. How do you identify and resolve data skewness?

#Performance Tuning #Data Skew #Salting

Practice

Data Engineer • Technical • medium

What is the difference between a Broadcast Hash Join and a Sort Merge Join in Spark? When would you force a Broadcast join?

#Spark Joins #Optimization

Practice

Data Engineer • Technical • easy

Explain the concept of Lazy Evaluation in Spark. Why is it beneficial for performance?

#Spark Core #Transformations vs Actions

Practice

Data Engineer • Technical • hard

Your Spark job fails with an OutOfMemory (OOM) error on the executor side. What parameters would you tweak or what code changes would you make?

#Troubleshooting #Memory Management #Spark Configuration

Practice

Data Engineer • Technical • medium

In Azure Data Factory (ADF), how do you design a dynamic pipeline that can copy data from 50 different on-premise SQL Server tables to Azure Data Lake without creating 50 separate copy activities?

#Azure Data Factory #Dynamic Pipelines #Metadata Driven ETL

Practice

Data Engineer • Technical • medium

Explain the architecture of Snowflake. How does its separation of storage and compute benefit a multi-tenant client environment?

#Snowflake #Cloud Architecture

Practice

Data Engineer • Technical • medium

What is Slowly Changing Dimension (SCD) Type 2? Explain how you would implement it in a data warehouse.

#Dimensional Modeling #SCD

Practice

Data Engineer • Technical • easy

Compare Star Schema and Snowflake Schema. If a client prioritizes query read performance over storage space, which would you recommend and why?

#Data Modeling #Schema Design

Practice

Data Scientist • Behavioral • medium

How do you prioritize tasks when working on multiple client deliverables with tight, overlapping deadlines?

#Time Management #Prioritization #Client Management

Practice

Data Scientist • Behavioral • medium

Tell me about a time you had to explain a complex machine learning model's predictions to a non-technical client stakeholder.

#Stakeholder Management #Explainable AI #SHAP #LIME

Practice

Data Scientist • Behavioral • medium

Describe a situation where your model's performance degraded in production. How did you troubleshoot and resolve it?

#Model Drift #Monitoring #Debugging

Practice

Data Scientist • Behavioral • hard

Tell me about a time you disagreed with a client's approach to a data problem. How did you handle it?

#Conflict Resolution #Consulting #Client Interaction

Practice

Data Scientist • Behavioral • medium

Describe a project where you had to clean and process a massive, messy dataset. What was your approach?

#Data Cleaning #Big Data #Problem Solving

Practice

Data Scientist • Coding • hard

Implement a Python function to calculate the TF-IDF of a given corpus of text from scratch (without using Scikit-Learn).

#Python #TF-IDF #Math #NLP

Practice

Data Scientist • Coding • medium

Write a SQL query to find the second highest salary of employees within each department.

#Window Functions #DENSE_RANK #Subqueries

Practice

Data Scientist • Coding • easy

Write a Python program to detect and remove outliers from a Pandas DataFrame using the Interquartile Range (IQR) method.

#Python #Pandas #Outlier Detection #Statistics

Practice

Data Scientist • Coding • easy

Write a SQL query to find all employees who joined in the last 30 days and have the job title 'Data Scientist'.

#Date Functions #Filtering #WHERE Clause

Practice

Data Scientist • Coding • easy

Write a Python function to reverse a string without using built-in functions like reversed() or slicing [::-1].

#Python #Strings #Loops

Practice

Data Scientist • Coding • medium

Write a Pandas script to merge two large datasets on a common key, and fill missing numerical values with the mean of their respective categories.

#Pandas #Data Imputation #Groupby #Merge

Practice

Data Scientist • Coding • medium

Write a SQL query to calculate the 7-day rolling average of daily active users (DAU).

#Window Functions #Rolling Average #Date Functions

Practice

Data Scientist • Coding • medium

Write a SQL query to find the top 3 customers by revenue in each region.

#Window Functions #RANK #CTEs

Practice

Data Scientist • System Design • hard

Design a recommendation engine for a telecom provider's value-added services (e.g., Netflix bundles, international roaming).

#Recommendation Systems #Collaborative Filtering #Cold Start

Practice

Data Scientist • System Design • hard

Design a predictive maintenance system for a manufacturing client using IoT sensor data.

#IoT #Time Series #Streaming Data #Architecture

Practice

Data Scientist • System Design • hard

Architect an MLOps pipeline for continuous training and deployment of a customer churn model.

#CI/CD #Model Registry #Airflow #Kubernetes

Practice

Data Scientist • System Design • medium

How would you deploy a machine learning model as a REST API using Docker and a cloud provider like AWS or Azure?

#Docker #FastAPI/Flask #Cloud Deployment #Containerization

Practice

Data Scientist • System Design • hard

Design a real-time fraud detection system for credit card transactions.

#Real-time Processing #Fraud Detection #Latency #Architecture

Practice

Data Scientist • Technical • medium

How do you prevent overfitting in deep neural networks?

#Overfitting #Dropout #Early Stopping #Regularization

Practice

Data Scientist • Technical • hard

Explain the architecture of Transformers and the concept of the self-attention mechanism.

#Transformers #Self-Attention #NLP

Practice

Data Scientist • Technical • medium

Explain the difference between Random Forest and Gradient Boosting. When would you choose one over the other?

#Ensemble Learning #Bagging #Boosting #Bias-Variance Tradeoff

Practice

Data Scientist • Technical • hard

How would you extract key entities and intent from unstructured IT support tickets to automate ticket routing?

#NER #Intent Classification #Transformers #Spacy

Practice

Data Scientist • Technical • medium

What are the core assumptions of Linear Regression, and how do you validate them?

#Linear Regression #Assumptions #Residual Analysis

Practice

Data Scientist • Technical • medium

What is the Curse of Dimensionality, and what techniques do you use to mitigate it?

#Dimensionality Reduction #PCA #Feature Selection

Practice

Data Scientist • Technical • hard

Explain the difference between ARIMA and LSTM for time series forecasting. When is one preferred over the other?

#ARIMA #LSTM #Deep Learning #Forecasting

Practice

Data Scientist • Technical • easy

How does L1 (Lasso) regularization differ from L2 (Ridge) regularization?

#Regularization #Lasso #Ridge #Overfitting

Practice

Data Scientist • Technical • medium

What evaluation metrics would you use for a highly skewed fraud detection dataset, and why?

#Evaluation Metrics #Fraud Detection #Precision-Recall

Practice

Data Scientist • Technical • medium

In a telecom churn prediction project, the dataset is highly imbalanced (95% non-churn, 5% churn). How do you handle this?

#Imbalanced Data #SMOTE #Class Weights #Evaluation Metrics

Practice

Data Scientist • Technical • easy

What is a p-value? How do you use it to make decisions in A/B testing?

#Hypothesis Testing #A/B Testing #p-value

Practice

Data Scientist • Technical • medium

What is SMOTE, and how does it work under the hood?

#SMOTE #Imbalanced Data #Algorithms

Practice

Data Scientist • Technical • medium

How do you handle out-of-vocabulary (OOV) words in NLP tasks?

#OOV #Tokenization #Word Embeddings #Subword Tokenization

Practice

Data Scientist • Technical • hard

Explain the mathematical intuition behind Support Vector Machines (SVM) and the kernel trick.

#SVM #Math #Kernel Trick

Practice

Data Scientist • Technical • medium

What is Data Leakage in machine learning, and how can you prevent it during cross-validation?

#Data Leakage #Cross-Validation #Pipelines

Practice

Data Scientist • Technical • medium

Explain ROC AUC. Can a model have a high accuracy but a low AUC? Give an example.

#ROC AUC #Evaluation Metrics #Imbalanced Data

Practice

Data Scientist • Technical • medium

Explain the working of the K-Means clustering algorithm. How do you choose the optimal 'K'?

#Clustering #K-Means #Elbow Method #Silhouette Score

Practice

DevOps Engineer • Behavioral • medium

Explain a time when a deployment failed in production. How did you troubleshoot and resolve it while communicating with the client?

#Troubleshooting #Client Communication #Incident Management

Practice

DevOps Engineer • Behavioral • easy

Describe a situation where you automated a manual, time-consuming process. What tools did you use and what was the business impact?

#Automation #Impact #Initiative

Practice

DevOps Engineer • Behavioral • medium

Tell me about a time you had to push back on a developer's request because it violated DevOps best practices or security policies.

#Communication #Security #Best Practices

Practice

DevOps Engineer • Coding • medium

Write a Bash script to check the disk usage of a Linux server and send an email alert if it exceeds 85%.

#Bash #Linux #Monitoring

Practice

DevOps Engineer • Coding • easy

Write a Bash script to find and delete all log files older than 30 days in a specific directory.

#Bash #Linux #Automation

Practice

DevOps Engineer • Coding • medium

Write a Python function using the boto3 library to list all running EC2 instances in a specific AWS region.

#Python #AWS #boto3

Practice

DevOps Engineer • Coding • medium

Write a Python script to parse an Nginx access log and count the number of 5xx HTTP errors.

#Python #Log Parsing #Regex

Practice

DevOps Engineer • Coding • medium

Write a Jenkinsfile snippet to build a Docker image and push it to AWS ECR, ensuring credentials are not hardcoded.

#Jenkins #Docker #AWS ECR #Groovy

Practice

DevOps Engineer • System Design • hard

Design a logging architecture for a distributed microservices application using the ELK stack.

#Logging #ELK #Microservices #Architecture

Practice

DevOps Engineer • System Design • hard

Design an AWS architecture for a highly available web application. Include VPC, Subnets, ASG, ALB, and RDS.

#AWS #High Availability #Networking #Architecture

Practice

DevOps Engineer • System Design • hard

Design a disaster recovery strategy for a stateful application hosted on AWS.

#AWS #Disaster Recovery #RTO/RPO

Practice

DevOps Engineer • System Design • medium

Explain how you would design a CI/CD pipeline for a microservices-based telecom application using Jenkins and Kubernetes.

#Jenkins #Kubernetes #Microservices #Pipeline Design

Practice

DevOps Engineer • System Design • hard

Explain how you would migrate an on-premise monolithic application to a containerized microservices architecture on Azure.

#Cloud Migration #Azure #Microservices #Docker

Practice

DevOps Engineer • Technical • hard

How do you upgrade a live Kubernetes cluster (e.g., EKS or AKS) with zero downtime?

#Kubernetes #EKS #AKS #Upgrades

Practice

DevOps Engineer • Technical • medium

How do you handle Jenkins master node failure? What is your backup and disaster recovery strategy?

#Jenkins #Disaster Recovery #High Availability

Practice

DevOps Engineer • Technical • medium

What is the difference between a Deployment and a StatefulSet in Kubernetes? When would you use a StatefulSet for an enterprise client?

#Kubernetes #StatefulSets #Deployments

Practice

DevOps Engineer • Technical • medium

How do you manage Terraform state files in a multi-developer environment? Explain state locking.

#Terraform #State Management #AWS S3 #DynamoDB

Practice

DevOps Engineer • Technical • hard

How do you secure a Docker container before deploying it to a production Kubernetes cluster?

#Docker #DevSecOps #Kubernetes Security

Practice

DevOps Engineer • Technical • easy

What are Ansible roles? How do you pass variables to a role in a playbook?

#Ansible #Automation #Roles

Practice

DevOps Engineer • Technical • medium

Explain the GitOps workflow. How does ArgoCD or Flux differ from a traditional push-based Jenkins pipeline?

#GitOps #ArgoCD #Kubernetes

Practice

DevOps Engineer • Technical • medium

A Kubernetes pod is stuck in 'CrashLoopBackOff'. Walk me through your exact troubleshooting steps.

#Kubernetes #Troubleshooting #Pods

Practice

DevOps Engineer • Technical • hard

How do you implement Blue-Green deployments in Kubernetes?

#Kubernetes #Deployment Strategies #Zero Downtime

Practice

DevOps Engineer • Technical • medium

What is the purpose of an Ingress Controller in Kubernetes? How does it differ from a LoadBalancer service?

#Kubernetes #Networking #Ingress

Practice

DevOps Engineer • Technical • medium

How do you handle secrets management in Terraform and Kubernetes? Have you used HashiCorp Vault?

#Secrets Management #Terraform #Kubernetes #Vault

Practice

DevOps Engineer • Technical • medium

Explain the difference between Terraform 'count' and 'for_each'. When would you use one over the other?

#Terraform #HCL

Practice

DevOps Engineer • Technical • medium

Describe your experience with Azure DevOps. How do you set up branch policies and build validation in Azure Repos?

#Azure DevOps #Git #Branch Policies

Practice

DevOps Engineer • Technical • medium

How do you monitor a Kubernetes cluster? What specific metrics would you alert on using Prometheus?

#Kubernetes #Prometheus #Grafana #Alerting

Practice

DevOps Engineer • Technical • easy

What is a Kubernetes DaemonSet? Give a real-world use case where you implemented it.

#Kubernetes #DaemonSet

Practice

DevOps Engineer • Technical • medium

How do you optimize Docker image sizes for faster CI/CD pipeline execution?

#Docker #Optimization #CI/CD

Practice

DevOps Engineer • Technical • hard

Explain the concept of 'Infrastructure Drift'. How do you detect and remediate it using Terraform?

#Terraform #Infrastructure Drift #Automation

Practice

DevOps Engineer • Technical • medium

What are Jenkins Shared Libraries? How do they help in maintaining pipelines for multiple projects?

#Jenkins #Groovy #DRY Principle

Practice

DevOps Engineer • Technical • hard

If an application is running slow, how do you determine if the bottleneck is at the network, CPU, memory, or database level?

#Troubleshooting #Performance Tuning #Linux

Practice

DevOps Engineer • Technical • easy

What is the difference between Ansible 'copy' and 'template' modules? When would you use Jinja2 templating?

#Ansible #Jinja2 #Modules

Practice

DevOps Engineer • Technical • easy

What is the purpose of AWS IAM Roles vs IAM Policies? How do you grant an EC2 instance access to an S3 bucket securely?

#AWS #IAM #Security

Practice

DevOps Engineer • Technical • hard

How do you manage database schema migrations in an automated CI/CD pipeline?

#Database #CI/CD #Automation

Practice

Frontend Engineer • Behavioral • medium

Describe a situation where you disagreed with a backend developer regarding an API contract. How was it resolved?

#Conflict Resolution #API Design #Collaboration

Practice

Frontend Engineer • Behavioral • medium

Tell me about a time you had to deliver a critical feature under a very tight deadline. Did you compromise on code quality?

#Time Management #Prioritization #Quality Assurance

Practice

Frontend Engineer • Behavioral • easy

How do you ensure you are aligned with your team's goals during an Agile sprint? Describe your participation in Agile ceremonies.

#Agile #Scrum #Team Collaboration

Practice

Frontend Engineer • Behavioral • medium

Tell me about a time when a client requested a major feature change in the middle of a sprint. How did you handle it?

#Agile #Communication #Scope Creep

Practice

Frontend Engineer • Behavioral • medium

Describe a time when a bug you introduced made it to production. How did you troubleshoot and resolve it?

#Debugging #Accountability #Incident Management

Practice

Frontend Engineer • Coding • medium

Write a function to flatten a deeply nested object into a single-level object with dot-separated keys.

#Recursion #Object Manipulation #Data Structures

Practice

Frontend Engineer • Coding • easy

Write a function to check if two strings are anagrams of each other.

#Strings #Hash Maps #Sorting

Practice

Frontend Engineer • Coding • hard

Implement a polyfill for Promise.all().

#Promises #Polyfills #Asynchronous JS

Practice

Frontend Engineer • Coding • hard

Implement a simple EventEmitter class in JavaScript with 'on', 'emit', and 'off' methods.

#Design Patterns #Observer Pattern #Classes

Practice

Frontend Engineer • Coding • medium

Write a function to deep clone a JavaScript object without using JSON.parse(JSON.stringify()).

#Recursion #Object Manipulation #Memory References

Practice

Frontend Engineer • Coding • medium

Write a function that splits an array into chunks of a specified size.

#Arrays #Data Manipulation

Practice

Frontend Engineer • Coding • medium

Write a custom React hook `useFetch` that takes a URL and returns the data, loading state, and error state.

#Custom Hooks #API Integration #State Management

Practice

Frontend Engineer • Coding • medium

Write a debounce function from scratch. How would you apply this to a search input field in a telecom billing portal to minimize API calls?

#Closures #Timers #Performance Optimization

Practice

Frontend Engineer • System Design • hard

Tech Mahindra is modernizing a legacy monolithic application. How would you design a Micro-frontends architecture to allow gradual migration?

#Micro-frontends #Module Federation #Legacy Migration

Practice

Frontend Engineer • System Design • hard

Design a real-time notification system for a web application. How do you choose between WebSockets, Server-Sent Events (SSE), and Long Polling?

#Real-time #WebSockets #SSE #Network Protocols

Practice

Frontend Engineer • System Design • medium

Design the state structure for an e-commerce shopping cart. How do you handle offline support and syncing when the user comes back online?

#State Management #Offline Storage #Syncing

Practice

Frontend Engineer • System Design • hard

Design the frontend architecture for a large-scale telecom customer portal. How would you handle state management, routing, and performance?

#Architecture #State Management #Performance #Scalability

Practice

Frontend Engineer • Technical • medium

Explain closures in JavaScript. Can you provide an example of a common bug caused by closures inside a loop, and how to fix it?

#Closures #Scope #Var vs Let

Practice

Frontend Engineer • Technical • medium

Explain the JavaScript Event Loop. How does it handle synchronous code, microtasks (like Promises), and macrotasks (like setTimeout)?

#Event Loop #Asynchronous JS #Concurrency

Practice

Frontend Engineer • Technical • medium

How does React's Virtual DOM work, and what is the Reconciliation process?

#Virtual DOM #Reconciliation #Diffing Algorithm

Practice

Frontend Engineer • Technical • medium

In a React application, how do you prevent memory leaks when a component unmounts while an asynchronous operation (like an API call) is still pending?

#Hooks #useEffect #Memory Management

Practice

Frontend Engineer • Technical • easy

For a complex enterprise dashboard layout, when would you choose CSS Grid over Flexbox, and vice versa?

#CSS Grid #Flexbox #Layout

Practice

Frontend Engineer • Technical • medium

In Angular, what is the difference between a Subject and a BehaviorSubject in RxJS? When would you use each?

#RxJS #Observables #State Management

Practice

Frontend Engineer • Technical • medium

Compare the Context API and Redux. For a large-scale Tech Mahindra enterprise application, which would you choose and why?

#State Management #Redux #Context API

Practice

Frontend Engineer • Technical • medium

You are integrating a third-party API for a client and encountering CORS errors. What is CORS, and how do you resolve it from the frontend and backend perspectives?

#CORS #Security #HTTP

Practice

Frontend Engineer • Technical • easy

What is CSS Specificity? How does the BEM (Block Element Modifier) methodology help in managing CSS in large projects?

#CSS Specificity #BEM #Maintainability

Practice

Frontend Engineer • Technical • hard

How would you optimize the Webpack configuration for a React application to reduce the final bundle size?

#Webpack #Code Splitting #Tree Shaking

Practice

Frontend Engineer • Technical • hard

Explain Angular's Change Detection mechanism. What is OnPush strategy and when should it be used?

#Change Detection #Performance #Zone.js

Practice

Frontend Engineer • Technical • easy

What is the difference between call(), apply(), and bind() in JavaScript?

#Functions #Context #This Keyword

Practice

Frontend Engineer • Technical • medium

Why is Web Accessibility (a11y) important? What are some key ARIA attributes and semantic HTML tags you use daily?

#Accessibility #HTML5 #ARIA

Practice

Frontend Engineer • Technical • medium

In React, what is the difference between useMemo and useCallback? Provide a scenario where misusing them degrades performance.

#Hooks #Performance Optimization #Memoization

Practice

Frontend Engineer • Technical • medium

Explain Prototypal Inheritance in JavaScript. How does the prototype chain work when looking up a property?

#Prototypes #Inheritance #Object Oriented JS

Practice

Frontend Engineer • Technical • medium

How do you use HTTP Interceptors in Angular? Give an example of how you would use one to handle authentication tokens.

#Interceptors #Authentication #HTTP Client

Practice

Frontend Engineer • Technical • medium

What are the security implications of storing JWT tokens in LocalStorage vs HttpOnly Cookies?

#Security #JWT #XSS #CSRF

Practice

Frontend Engineer • Technical • easy

What are Error Boundaries in React? How do you implement them, and what types of errors do they NOT catch?

#Error Handling #Component Lifecycle

Practice

Full Stack Engineer • Behavioral • medium

Tell me about a time you had a disagreement with a client regarding technical requirements. How did you resolve it?

#Communication #Conflict Resolution #Client Management

Practice

Full Stack Engineer • Behavioral • medium

How do you ensure code quality and mentor junior developers in a distributed agile team?

#Mentorship #Agile #Code Quality

Practice

Full Stack Engineer • Behavioral • easy

Tell me about a time you had to learn a new technology stack quickly to meet project needs.

#Learning #Flexibility

Practice

Full Stack Engineer • Behavioral • medium

How do you handle a situation where a production deployment fails in a client environment?

#Incident Management #Accountability

Practice

Full Stack Engineer • Behavioral • medium

Describe a situation where you had to deliver a critical project under a very tight deadline.

#Time Management #Stress Management

Practice

Full Stack Engineer • Coding • medium

Find the longest substring without repeating characters in a given string.

#Strings #Sliding Window

Practice

Full Stack Engineer • Coding • easy

Write a function to check if a given string containing brackets is valid (Valid Parentheses).

#Stacks #Strings

Practice

Full Stack Engineer • Coding • hard

Detect a cycle in a directed graph.

#Graphs #DFS

Practice

Full Stack Engineer • Coding • medium

Implement a debounce function in JavaScript that limits the rate at which a function can fire.

#JavaScript #Closures #Asynchronous Programming

Practice

Full Stack Engineer • Coding • medium

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

#Database #SQL Queries

Practice

Full Stack Engineer • Coding • medium

Write a Java Stream API snippet to group a list of Employee objects by their department name and count the number of employees in each.

#Java #Stream API #Collections

Practice

Full Stack 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

Full Stack Engineer • Coding • easy

Find the first non-repeating character in a string and return its index.

#Strings #Hash Table

Practice

Full Stack Engineer • Coding • easy

Reverse a singly linked list.

#Linked Lists #Pointers

Practice

Full Stack Engineer • Coding • medium

Given a collection of intervals, merge all overlapping intervals.

#Arrays #Sorting

Practice

Full Stack Engineer • System Design • medium

Explain the Circuit Breaker pattern and how you would implement it using Resilience4j.

#Microservices #Fault Tolerance

Practice

Full Stack Engineer • System Design • hard

Design a scalable notification system (Email, SMS, Push) for a banking client.

#Architecture #Message Queues #Third-party Integration

Practice

Full Stack Engineer • System Design • hard

How would you design a microservices architecture for an e-commerce platform?

#Microservices #API Gateway #Databases

Practice

Full Stack Engineer • System Design • medium

Design a URL shortener service like Bitly.

#Architecture #Hashing #Databases

Practice

Full Stack Engineer • System Design • hard

Design a telecom billing system that processes millions of call detail records (CDRs) daily.

#Architecture #Batch Processing #Scalability

Practice

Full Stack Engineer • Technical • medium

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

#Spring Boot #Frameworks

Practice

Full Stack Engineer • Technical • easy

What is the difference between @Controller and @RestController in Spring?

#Spring Boot #REST APIs

Practice

Full Stack Engineer • Technical • medium

What are React Hooks? Explain the useEffect hook with an example of a cleanup function.

#React #Hooks #Lifecycle

Practice

Full Stack Engineer • Technical • medium

Explain the difference between process.nextTick() and setImmediate() in Node.js.

#Node.js #Event Loop

Practice

Full Stack Engineer • Technical • hard

Explain the Saga design pattern. How do you handle distributed transactions across microservices?

#Distributed Systems #Design Patterns

Practice

Full Stack Engineer • Technical • medium

How do you handle exceptions globally in a Spring Boot REST API?

#Spring Boot #Error Handling

Practice

Full Stack Engineer • Technical • medium

What is the N+1 select problem in Hibernate, and how do you solve it?

#Hibernate #ORM #SQL

Practice

Full Stack Engineer • Technical • medium

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

#React #State Management #Redux

Practice

Full Stack Engineer • Technical • medium

Explain closures in JavaScript and provide a practical use case.

#JavaScript #Core Concepts

Practice

Full Stack Engineer • Technical • medium

What are the differences between RabbitMQ and Apache Kafka? When would you choose one over the other?

#Message Brokers #Kafka #RabbitMQ

Practice

Full Stack Engineer • Technical • medium

How does Angular's Dependency Injection differ from React's Context API?

#Angular #React #Architecture

Practice

Full Stack Engineer • Technical • medium

How do you secure a REST API using JWT? Explain the authentication and authorization flow.

#JWT #Authentication #REST APIs

Practice

Full Stack Engineer • Technical • medium

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

#React #Architecture

Practice

Full Stack Engineer • Technical • easy

Explain Dependency Injection and its types in the Spring framework.

#Spring #Design Patterns

Practice

Full Stack Engineer • Technical • medium

Explain the internal working of ConcurrentHashMap in Java and how it differs from a synchronized HashMap.

#Java #Concurrency #Data Structures

Practice

Machine Learning Engineer • Behavioral • medium

Describe a situation where your model performed well in training but failed in production. How did you handle it?

#Troubleshooting #Experience

Practice

Machine Learning Engineer • Behavioral • medium

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

#Stakeholder Management #Communication

Practice

Machine Learning Engineer • Behavioral • easy

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

#Prioritization #Consulting

Practice

Machine Learning Engineer • Behavioral • medium

Tell me about a time you disagreed with a senior engineer or architect on a technical approach.

#Teamwork #Professionalism

Practice

Machine Learning Engineer • Behavioral • easy

Why do you want to join Tech Mahindra, and how do you see yourself contributing to our AI/ML practice?

#Motivation #Company Knowledge

Practice

Machine Learning Engineer • Coding • easy

Using Pandas, how would you group a dataset by 'customer_id' and find the top 5 customers by total purchase amount?

#Python #Pandas #Data Wrangling

Practice

Machine Learning Engineer • Coding • hard

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

#Python #Machine Learning #Math

Practice

Machine Learning Engineer • Coding • easy

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

#SQL #Aggregations #Subqueries

Practice

Machine Learning Engineer • Coding • medium

Write a Python function to compute the cosine similarity between two lists of numbers without using external libraries like scikit-learn.

#Python #Linear Algebra

Practice

Machine Learning Engineer • Coding • easy

Write a Python script to reverse a singly linked list.

#Data Structures #Linked Lists

Practice

Machine Learning Engineer • Coding • medium

Write a Python function to find the longest substring without repeating characters.

#Python #Strings #Sliding Window

Practice

Machine Learning Engineer • System Design • hard

Design a predictive maintenance system for a telecom client's cell towers.

#IoT #Time Series #Architecture

Practice

Machine Learning Engineer • System Design • medium

How would you deploy an ML model as a REST API using FastAPI and Docker?

#Deployment #Docker #FastAPI

Practice

Machine Learning Engineer • System Design • hard

Design a real-time fraud detection system for a banking client.

#Real-time Processing #Fraud Detection

Practice

Machine Learning Engineer • System Design • hard

How would you design a scalable recommendation engine for an e-commerce platform?

#Recommendation Systems #Scalability

Practice

Machine Learning Engineer • System Design • medium

Design an MLOps pipeline using AWS SageMaker or Azure ML for continuous training and deployment.

#Cloud #CI/CD #Pipeline

Practice

Machine Learning Engineer • System Design • medium

Design a document extraction system using OCR and NLP to process client invoices.

#Computer Vision #NLP #OCR

Practice

Machine Learning Engineer • Technical • easy

What is the role of an activation function in a neural network? Explain ReLU and its variants.

#Neural Networks #Activation Functions

Practice

Machine Learning Engineer • Technical • medium

What are the key differences between PyTorch and TensorFlow? Why might you choose one over the other for a production deployment?

#Frameworks #PyTorch #TensorFlow

Practice

Machine Learning Engineer • Technical • medium

Explain the concept of cross-validation. Why is time-series cross-validation different from standard K-Fold?

#Validation #Time Series

Practice

Machine Learning Engineer • Technical • easy

What are the differences between bagging and boosting?

#Ensemble Methods

Practice

Machine Learning Engineer • Technical • medium

How do you detect and handle data drift in a deployed machine learning model?

#Monitoring #Data Drift

Practice

Machine Learning Engineer • Technical • hard

How do you optimize the inference speed of a Large Language Model for a production application?

#LLMs #Optimization #Deployment

Practice

Machine Learning Engineer • Technical • medium

Explain the difference between generative and discriminative models.

#Theory #Modeling

Practice

Machine Learning Engineer • Technical • easy

Explain the bias-variance tradeoff. How do you know if your model is overfitting?

#Theory #Model Evaluation

Practice

Machine Learning Engineer • Technical • medium

What is SMOTE and how does it work? What are its limitations?

#Imbalanced Data #SMOTE

Practice

Machine Learning Engineer • Technical • medium

Explain the difference between Random Forest and Gradient Boosting. Which would you use for a highly imbalanced dataset and why?

#Ensemble Methods #Classification

Practice

Machine Learning Engineer • Technical • medium

How do you handle missing values in a dataset where 40% of the data in a critical feature is missing?

#Data Cleaning #Imputation

Practice

Machine Learning Engineer • Technical • hard

Explain the architecture of a Transformer model. How does the self-attention mechanism work?

#NLP #Transformers #Attention

Practice

Machine Learning Engineer • Technical • medium

What is the Curse of Dimensionality, and how does Principal Component Analysis (PCA) help mitigate it?

#Dimensionality Reduction #PCA

Practice

Machine Learning Engineer • Technical • easy

How do you evaluate a classification model on a highly imbalanced dataset?

#Metrics #Classification

Practice

Machine Learning Engineer • Technical • medium

Explain L1 and L2 regularization. When would you prefer Lasso over Ridge?

#Regularization #Linear Models

Practice

Machine Learning Engineer • Technical • medium

What are the vanishing and exploding gradient problems in RNNs, and how do LSTMs solve them?

#RNN #LSTM #Gradients

Practice

Machine Learning Engineer • Technical • hard

How does XGBoost handle missing values internally?

#XGBoost #Tree Models

Practice

Machine Learning Engineer • Technical • hard

Explain the concept of Retrieval-Augmented Generation (RAG). How would you implement it for a client's internal knowledge base?

#LLMs #RAG #Vector Databases

Practice

Product Manager • Behavioral • hard

Tell me about a time you had to say 'no' to a key client regarding a feature request. How did you manage the relationship?

#Client Relations #Prioritization #Conflict Resolution

Practice

Product Manager • Behavioral • hard

A key feature is delayed by two weeks, threatening a strict client SLA. How do you communicate and mitigate this risk?

#Risk Management #Communication #SLA

Practice

Product Manager • Behavioral • medium

Describe a time you led a cross-functional team (engineering, design, sales) without having direct authority over them.

#Influence #Cross-functional #Team Building

Practice

Product Manager • Behavioral • medium

Tell me about a time you had to align conflicting priorities between an external client stakeholder and your internal engineering team.

#Conflict Resolution #Agile #Client Relations

Practice

Product Manager • Behavioral • medium

How do you handle scope creep from a major enterprise client in the middle of an agile sprint?

#Agile #Scope Management #Consulting

Practice

Product Manager • Behavioral • medium

Walk me through your process of conducting user research for a complex B2B enterprise tool where the actual end-users are hard to reach.

#User Research #Enterprise #Discovery

Practice

Product Manager • Behavioral • medium

Tell me about a time you used data to fundamentally change a product roadmap that was already agreed upon.

#Data-Driven #Roadmap #Influence

Practice

Product Manager • Behavioral • easy

Tell me about a time you had to quickly learn a completely new industry domain to effectively manage a product.

#Adaptability #Domain Knowledge #Learning

Practice

Product Manager • Behavioral • hard

How do you balance building custom features for a high-paying enterprise client versus maintaining a standardized, scalable product roadmap?

#Roadmap #B2B #Prioritization

Practice

Product Manager • Behavioral • hard

Describe a situation where you had to sunset a legacy product. How did you manage the transition for existing enterprise clients?

#Product Lifecycle #Client Management #Sunsetting

Practice

Product Manager • Behavioral • hard

How do you prioritize features when a key enterprise client demands everything in Q1, but your engineering capacity has just been halved?

#Prioritization #Client Management #Resource Constraints

Practice

Product Manager • Behavioral • medium

Describe a time a product or feature launch failed. What metrics indicated the failure, and how did you pivot?

#Failure #Metrics #Pivot Strategy

Practice

Product Manager • Behavioral • medium

Tell me about a time you successfully negotiated contract terms, scope, or SLAs with a third-party vendor or partner.

#Negotiation #Vendor Management #Partnerships

Practice

Product Manager • Coding • easy

Write a SQL query to identify enterprise customers who have not logged into the portal for 90 days but still have an active billing status.

#Data Analysis #User Engagement #Retention

Practice

Product Manager • Coding • medium

Write a SQL query to find the top 10% of enterprise users by API call volume in the last 30 days.

#Data Analysis #API Metrics #Window Functions

Practice

Product Manager • Coding • medium

Write a SQL query to calculate the month-over-month churn rate for a B2B subscription service.

#Data Analysis #Churn #Business Metrics

Practice

Product Manager • Coding • medium

Write a SQL query to find the average time spent per session for users, grouped by device type (iOS, Android, Web).

#Data Analysis #Engagement #Aggregation

Practice

Product Manager • System Design • medium

How would you design an AI-driven chatbot for a telecom customer support portal to reduce L1 support tickets?

#AI/ML #Customer Support #Telecom

Practice

Product Manager • System Design • medium

Design an IoT fleet tracking API. What endpoints would you need, and how would you handle offline data syncing?

#IoT #APIs #Automotive

Practice

Product Manager • System Design • medium

Design a scalable notification system for an enterprise HR application that supports email, SMS, and push notifications.

#Notifications #Enterprise #Architecture

Practice

Product Manager • System Design • hard

Design a system to handle high-volume data ingestion from millions of smart meters for a utility client.

#Big Data #IoT #Utilities

Practice

Product Manager • System Design • hard

Design an automated billing system for a telecom operator transitioning from prepaid to a subscription-based model.

#Telecom #Billing #Subscriptions

Practice

Product Manager • System Design • hard

Walk me through how you would manage the product strategy for migrating a client's legacy on-premise CRM to a cloud-native microservices architecture.

#Cloud Migration #Microservices #Enterprise IT

Practice

Product Manager • System Design • hard

Design a fraud detection system for a digital wallet application built for a telecom provider.

#FinTech #Security #Machine Learning

Practice

Product Manager • System Design • hard

Design a B2B dashboard for a major telecom client to monitor 5G network latency and throughput in real-time.

#Telecom #Dashboards #5G #Real-time Data

Practice

Product Manager • System Design • hard

How would you design a self-service portal for enterprise clients to manage, monitor, and optimize their cloud infrastructure usage?

#Cloud #Enterprise #RBAC

Practice

Product Manager • Technical • medium

What framework do you use to evaluate whether to build a new product capability in-house, buy an off-the-shelf solution, or partner with a third party?

#Strategic Planning #Frameworks #Build vs Buy

Practice

Product Manager • Technical • medium

You notice a sudden 15% drop in user engagement on a client's e-commerce app after the latest release. How do you investigate?

#Root Cause Analysis #Metrics #Debugging

Practice

Product Manager • Technical • medium

What are the key differences in managing a product in a traditional waterfall environment versus an agile environment, specifically within IT services?

#Agile #SDLC #Consulting

Practice

Product Manager • Technical • hard

How would you design a Go-To-Market (GTM) strategy for a new AI-driven predictive maintenance tool for our manufacturing clients?

#GTM #AI #Manufacturing

Practice

Product Manager • Technical • medium

How do you measure the ROI of a technical debt reduction initiative to justify it to business stakeholders?

#Tech Debt #Metrics #Business Value

Practice

Product Manager • Technical • medium

What is your approach to writing a PRD for a highly technical product, such as an API gateway for a banking client?

#PRD #APIs #Infrastructure

Practice

Product Manager • Technical • easy

Explain the difference between REST and GraphQL to a non-technical client stakeholder who is deciding on an integration approach.

#APIs #Client Communication #Architecture

Practice

Product Manager • Technical • medium

What metrics would you track to evaluate the success and adoption of an internal developer portal built for our engineering teams?

#Metrics #Internal Tools #Developer Experience

Practice

Product Manager • Technical • medium

How would you price a new SaaS-based fleet management product for our enterprise automotive clients?

#Pricing Models #B2B #Automotive

Practice

Software Engineer • Behavioral • medium

Describe a time when you had to deliver a critical project under a very tight deadline.

#Pressure #Delivery #Prioritization

Practice

Software Engineer • Behavioral • easy

Why do you want to join Tech Mahindra, and how do you align with our focus on IT consulting and telecom?

#Company Knowledge #Motivation

Practice

Software Engineer • Behavioral • easy

How do you handle a situation where you are assigned a technology stack you have no prior experience with?

#Learning #Flexibility

Practice

Software Engineer • Behavioral • medium

Tell me about a time you had a disagreement with a client regarding a technical requirement. How did you resolve it?

#Communication #Conflict Resolution #Consulting

Practice

Software Engineer • Coding • medium

Group a list of strings by their length using Java 8 Streams.

#Java 8 #Streams #Collections

Practice

Software Engineer • Coding • medium

Implement a thread-safe Singleton design pattern in Java.

#Core Java #Multithreading #Design Patterns

Practice

Software Engineer • Coding • easy

Write a program to reverse a string without using any inbuilt functions like reverse().

#Strings #Loops

Practice

Software Engineer • Coding • medium

Write a program to detect a loop in a LinkedList.

#LinkedList #Pointers

Practice

Software Engineer • Coding • hard

Merge two sorted arrays without using extra space.

#Arrays #Sorting #Optimization

Practice

Software Engineer • Coding • medium

Given an array of integers, find the contiguous subarray with the maximum sum (Kadane's Algorithm).

#Arrays #Dynamic Programming

Practice

Software Engineer • Coding • easy

Write a Java program to check if two strings are anagrams of each other.

#Strings #Hashing #Sorting

Practice

Software Engineer • Coding • medium

Write a Java 8 Stream API query to find the first non-repeating character in a given string.

#Java 8 #Streams #Strings

Practice

Software Engineer • Coding • medium

Find the second highest number in an integer array in a single pass.

#Arrays #Optimization

Practice

Software Engineer • System Design • hard

Design a microservices architecture for a Telecom Billing System.

#Microservices #Telecom Domain #Scalability

Practice

Software Engineer • System Design • hard

Design a URL Shortener service like Bitly.

#Scalability #Hashing #Database

Practice

Software Engineer • System Design • hard

How would you implement rate limiting for a public-facing API?

#API Gateway #Security #Algorithms

Practice

Software Engineer • System Design • hard

How do you ensure high availability and fault tolerance in a Spring Boot microservices ecosystem?

#Microservices #Resilience #Cloud

Practice

Software Engineer • System Design • hard

Explain the Saga design pattern for distributed transactions in microservices.

#Microservices #Transactions #Architecture

Practice

Software Engineer • Technical • easy

Explain the difference between TRUNCATE, DELETE, and DROP in SQL.

#Database #DDL #DML

Practice

Software Engineer • Technical • medium

What are clustered and non-clustered indexes in SQL?

#Database #Indexing #Performance

Practice

Software Engineer • Technical • medium

How do you secure a REST API? Explain JWT token-based authentication.

#REST #JWT #Spring Security

Practice

Software Engineer • Technical • medium

Write a SQL query to fetch all duplicate records from a table.

#Database #Queries #Aggregation

Practice

Software Engineer • Technical • medium

What is the N+1 select problem in Hibernate/JPA, and how do you resolve it?

#Hibernate #JPA #Performance

Practice

Software Engineer • Technical • medium

How do you handle exceptions globally in a Spring Boot application?

#Exception Handling #AOP

Practice

Software Engineer • Technical • easy

Explain the difference between @Controller and @RestController in Spring Boot.

#Spring MVC #Annotations

Practice

Software Engineer • Technical • medium

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

#Database #Queries #Window Functions

Practice

Software Engineer • Technical • medium

What is the difference between ConcurrentHashMap and Collections.synchronizedMap()?

#Multithreading #Collections

Practice

Software Engineer • Technical • medium

Explain the internal working of a HashMap in Java. What changes were introduced in Java 8?

#Collections #Data Structures #Hashing

Practice

Software Engineer • Technical • medium

What is Spring Boot Actuator and why is it used in production environments?

#Monitoring #DevOps

Practice

Software Engineer • Technical • medium

What is the difference between @Autowired and Constructor injection? Which is recommended?

#Dependency Injection #Best Practices

Practice

Software Engineer • Technical • medium

Explain the Bean lifecycle in the Spring framework.

#Core Spring #Lifecycle

Practice

Software Engineer • Technical • easy

What is the difference between an Abstract Class and an Interface in Java 8?

#OOP #Java 8

Practice

Software Engineer • Technical • medium

Explain CI/CD. How would you set up a basic Jenkins pipeline for a Spring Boot application?

#Jenkins #CI/CD #Deployment

Practice

Software Engineer • Technical • medium

Explain the SOLID principles with real-world Java examples.

#OOP #Design Principles

Practice

Software Engineer • Technical • medium

How does Garbage Collection work in Java? What are the different types of Garbage Collectors?

#JVM #Memory Management

Practice

Tech Mahindra

The Interview Loop

Recruiter Screen (30 min)

Technical Loop (3-4 Rounds)

Interview Question Bank

How would you explain the concept of 'Infrastructure as Code' (IaC) to a non-technical project manager who is concerned about project timelines?

Tell me about a time you disagreed with a client or a senior architect regarding a cloud migration strategy. How did you handle it?

Tell me about a time you had to learn a completely new cloud technology or tool under a very tight project deadline.

Describe a time when a critical production system went down under your watch. What was your immediate reaction, and how did you resolve it?

Write a Python script that traverses a given directory, finds all duplicate files based on their MD5 hash, and prints their paths.

Write a Python function that makes a GET request to a REST API, handles pagination, and returns a consolidated list of all items.

Write a Bash script that parses an Nginx access log file, counts the number of HTTP 500 errors, and outputs the top 5 IP addresses generating these errors.

Write a Python script using Boto3 to find and delete all unattached EBS volumes in a specific AWS region to optimize client costs.

A client wants to migrate a monolithic legacy telecom billing system to a microservices architecture on Kubernetes. How would you approach this system design?

Design a highly available and fault-tolerant 3-tier web architecture on AWS for a telecom client experiencing variable traffic.

Design a serverless architecture for a web application that allows users to upload images, processes them to create thumbnails, and serves them globally.

Design a Disaster Recovery (DR) strategy for a mission-critical financial application. Define RTO and RPO in your answer.

How would you design a database migration strategy from an on-premises SQL Server to AWS RDS with near-zero downtime?

Design a scalable log ingestion and analytics platform for a global enterprise generating 5TB of logs daily.

Explain the DRY principle in the context of Terraform. How do you implement it?

You are alerted that a Linux VM in Azure is running at 100% CPU. What commands do you run to identify the root cause?

Compare AWS CloudFormation and Terraform. Why might a company choose Terraform over CloudFormation?

Explain how Prometheus and Grafana work together in a Kubernetes environment. How does Prometheus discover targets?

A client needs a secure, highly available connection between their corporate data center and an Azure VNet. Walk me through setting up an Azure VPN Gateway.

What are Azure Resource Manager (ARM) templates, and how do they compare to Azure Bicep?

When would you choose AWS ECS over AWS EKS for container orchestration?

What are the key considerations and steps when Dockerizing a legacy stateful application?

How do you manage and secure Terraform state files in a collaborative team environment?

A client wants to connect multiple AWS VPCs across different regions and their on-premises data center. Would you use VPC Peering or AWS Transit Gateway, and why?

One of your Kubernetes pods is stuck in a CrashLoopBackOff state. Walk me through your step-by-step troubleshooting process.

Explain the different Amazon S3 storage classes. How would you design a lifecycle policy for a client's compliance logs that must be kept for 7 years but are rarely accessed after 30 days?

How would you integrate an on-premises Active Directory with Azure Active Directory (Entra ID) for a seamless SSO experience?

Explain how you would set up a CI/CD pipeline in Jenkins to build, test, and deploy a Dockerized Node.js application to AWS ECS.

What is the difference between an IAM Role and an IAM Policy in AWS? When would you use a Role instead of an IAM User?

You receive an alert that an Application Load Balancer (ALB) is returning 502 Bad Gateway errors. What are the potential causes and how do you fix them?

Compare Blue-Green deployments with Canary deployments. In what scenario would you recommend one over the other to a client?

How do you secure a public-facing REST API hosted on AWS API Gateway and Lambda?

What are AWS Lambda 'cold starts', and what strategies would you use to mitigate them in a latency-sensitive application?

Explain the differences between ClusterIP, NodePort, and LoadBalancer service types in Kubernetes.

How do you securely manage secrets (like database passwords or API keys) in a CI/CD pipeline and runtime environment?

Working at an IT services company often means handling multiple client deliverables at once. How do you prioritize your tasks?

Explain the concept of 'Data Partitioning' to a non-technical business stakeholder.

Describe the most challenging bug you have faced in a production data pipeline. How did you troubleshoot and resolve it?

How do you handle a situation where the upstream source system changes its data format (e.g., adding/removing columns) without notifying the data engineering team?

Tell me about a time you had to push back on a client or stakeholder who demanded an unrealistic deadline for a data delivery.

Write a Python function to find the first non-repeating character in a given string. Optimize it for time complexity.

You need to extract data from a third-party REST API for a client project. The API limits responses to 100 records per request. Write a Python snippet to handle pagination and extract all records.

Given a list of dictionaries representing employee data (id, name, department), write Python code to group the employees by department.

Write a Python script to connect to an AWS S3 bucket, list all files with a '.json' extension, and print their sizes.

Write a PySpark snippet to merge new incoming data into an existing Delta Lake table, updating existing records and inserting new ones (Upsert).

Write a SQL query to pivot a table containing 'Year', 'Month', and 'Revenue' so that each Month becomes a column with the corresponding Revenue.

Given a table of Telecom Call Detail Records (CDRs), write a SQL query to calculate the rolling 7-day cumulative data usage for each specific user.

How do you find and delete duplicate records in a massive SQL table without creating a temporary table?

Write a Python script using Pandas or PySpark to read a 10GB CSV file, drop rows where the 'customer_id' is null, and write the output partitioned by 'region' into Parquet format.

Write a SQL query to find the 3rd highest salary from an Employee table without using the LIMIT keyword.

Design an ETL pipeline on AWS to ingest daily Call Detail Records (CDRs) from an SFTP server, transform them, and load them into Redshift for reporting.

Design a real-time streaming pipeline to process IoT sensor data from manufacturing plants, detect anomalies, and store the results.

A healthcare client wants to move from a traditional data warehouse to a Data Lakehouse architecture. How would you design this using Databricks?

Design a batch processing pipeline to ingest 500GB of transactional data daily. How do you handle incremental loads?

A client complains that a critical reporting query taking data from a 50-million row table is running too slow. Walk me through your step-by-step approach to optimize it.

How do you schedule and monitor your data pipelines? Explain the core components of Apache Airflow.

In PySpark, what is the difference between repartition() and coalesce()? When should you use which?

What is 'Idempotency' in the context of data engineering? Why is it critical for data pipelines?

Explain your Git workflow for deploying data engineering code across Development, QA, and Production environments.

Explain the difference between ROW_NUMBER(), RANK(), and DENSE_RANK(). Provide a scenario where you would specifically choose DENSE_RANK() over RANK().

How do you ensure data quality and integrity in your ETL pipelines? What specific checks do you automate?

Explain the internal architecture of Apache Spark. What happens under the hood when you submit a Spark job?

During a data migration project, your PySpark job is running extremely slow and some tasks are taking much longer than others. How do you identify and resolve data skewness?

What is the difference between a Broadcast Hash Join and a Sort Merge Join in Spark? When would you force a Broadcast join?

Explain the concept of Lazy Evaluation in Spark. Why is it beneficial for performance?

Your Spark job fails with an OutOfMemory (OOM) error on the executor side. What parameters would you tweak or what code changes would you make?

In Azure Data Factory (ADF), how do you design a dynamic pipeline that can copy data from 50 different on-premise SQL Server tables to Azure Data Lake without creating 50 separate copy activities?

Explain the architecture of Snowflake. How does its separation of storage and compute benefit a multi-tenant client environment?

What is Slowly Changing Dimension (SCD) Type 2? Explain how you would implement it in a data warehouse.

Compare Star Schema and Snowflake Schema. If a client prioritizes query read performance over storage space, which would you recommend and why?

How do you prioritize tasks when working on multiple client deliverables with tight, overlapping deadlines?

Tell me about a time you had to explain a complex machine learning model's predictions to a non-technical client stakeholder.

Describe a situation where your model's performance degraded in production. How did you troubleshoot and resolve it?

Tell me about a time you disagreed with a client's approach to a data problem. How did you handle it?

Describe a project where you had to clean and process a massive, messy dataset. What was your approach?