Capgemini

Capgemini

Global leader in partnering with companies to transform and manage their business by harnessing the power of technology.

4 Rounds ~21 Days Medium
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The Interview Loop

Recruiter Screen (30 min)

Standard fit check, behavioral questions, and resume overview.

Technical Loop (3-4 Rounds)

Deep dive into domain knowledge, coding, and system design.

Interview Question Bank

Backend Engineer • Behavioral • medium

Describe your experience working in an Agile/Scrum environment. How do you handle a situation where a client drastically changes requirements in the middle of a sprint?

#Agile #Adaptability
Practice
Backend Engineer • Behavioral • medium

As a consultant, you might be assigned to multiple deliverables with conflicting deadlines. How do you prioritize your work and manage stakeholder expectations?

#Time Management #Prioritization
Practice
Backend Engineer • Behavioral • medium

Tell me about a time you disagreed with a client or a product owner regarding a technical requirement. How did you communicate your concerns and reach a resolution?

#Communication #Client Management
Practice
Backend Engineer • Behavioral • easy

Describe a situation where you had to learn a completely new technology or framework in a very short amount of time to deliver a client project.

#Adaptability #Learning
Practice
Backend Engineer • Behavioral • medium

Tell me about a time you introduced a critical bug into production. How was it discovered, how did you fix it, and what did you learn to prevent it in the future?

#Accountability #Problem Solving
Practice
Backend Engineer • Coding • medium

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

#Arrays #Sorting
Practice
Backend Engineer • Coding • medium

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

#Strings #Hash Table
Practice
Backend Engineer • Coding • medium

Find the Kth largest element in an unsorted array. Can you do it in O(N) time complexity on average?

#Arrays #Heap #Quickselect
Practice
Backend Engineer • Coding • medium

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

#Strings #Sliding Window
Practice
Backend Engineer • Coding • hard

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

#Linked List #Hash Table #Design
Practice
Backend Engineer • Coding • easy

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

#Stack #Strings
Practice
Backend Engineer • Coding • easy

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

#Arrays #Hash Table
Practice
Backend Engineer • Coding • hard

Given the head of a linked list, reverse the nodes of the list k at a time, and return the modified list.

#Linked List #Recursion
Practice
Backend Engineer • System Design • medium

Design a URL shortening service like Bitly. Focus on the database schema, the hashing algorithm, and how you would handle high read throughput.

#Scalability #Hashing #Databases
Practice
Backend Engineer • System Design • medium

In a distributed microservices environment deployed on AWS, how would you design a centralized logging and tracing system to debug cross-service requests?

#Observability #AWS #Microservices
Practice
Backend Engineer • System Design • hard

Design a highly available checkout API for an e-commerce client preparing for a Black Friday sale. How do you prevent overselling inventory?

#Concurrency #Caching #Distributed Locking
Practice
Backend Engineer • System Design • medium

Design a scalable notification system that can send emails, SMS, and push notifications to millions of users. How do you ensure messages are not sent multiple times?

#Message Queues #Idempotency #Scalability
Practice
Backend Engineer • Technical • medium

What are the different bean scopes in Spring Boot? Explain a scenario where you would use the Prototype scope over the default Singleton scope.

#Spring Boot #Java #Dependency Injection
Practice
Backend Engineer • Technical • medium

Walk me through the process of containerizing a Spring Boot application. What are the key instructions you would include in your Dockerfile to optimize the image size?

#Docker #Spring Boot #CI/CD
Practice
Backend Engineer • Technical • medium

What is the N+1 query problem in Hibernate/JPA? How can you detect it, and what are the different ways to resolve it?

#Hibernate #JPA #Performance
Practice
Backend Engineer • Technical • medium

How do you implement global exception handling in a Spring Boot REST API? Explain the use of @ControllerAdvice and @ExceptionHandler.

#Spring Boot #Error Handling
Practice
Backend Engineer • Technical • easy

With the introduction of default methods in Java 8, what is the practical difference between an abstract class and an interface? When would you choose one over the other?

#Java #OOP
Practice
Backend Engineer • Technical • medium

Explain the CAP theorem. If a client requires a highly available and partition-tolerant system, what database would you choose and what trade-offs in consistency would you have to accept?

#Distributed Systems #CAP Theorem #NoSQL
Practice
Backend Engineer • Technical • hard

How would you implement API rate limiting in a Spring Boot application to prevent abuse? Discuss the Token Bucket algorithm.

#API Gateway #Algorithms #Security
Practice
Backend Engineer • Technical • medium

Explain the typical stages of a CI/CD pipeline for a backend Java application. What tools have you used, and how do you handle database migrations in the pipeline?

#CI/CD #Jenkins #Flyway/Liquibase
Practice
Backend Engineer • Technical • hard

Explain how Garbage Collection works in the JVM. If a client application is experiencing OutOfMemoryError in production, what steps would you take to diagnose and fix the memory leak?

#Java #JVM #Debugging
Practice
Backend Engineer • Technical • medium

How do you secure a public-facing REST API? Explain the flow of OAuth2 and how JWTs are structured and validated.

#OAuth2 #JWT #API Security
Practice
Backend Engineer • Technical • medium

What are the best practices for designing a RESTful API? Discuss versioning strategies, pagination, and appropriate use of HTTP status codes.

#REST #Web Services
Practice
Backend Engineer • Technical • hard

How do you handle distributed transactions across multiple microservices? Explain the Saga design pattern and the concept of compensating transactions.

#Microservices #Distributed Systems #Saga Pattern
Practice
Backend Engineer • Technical • medium

How do database indexes work under the hood? What are the performance trade-offs of adding multiple indexes to a highly transactional table?

#SQL #Performance #B-Trees
Practice
Backend Engineer • Technical • medium

A client wants to build a product catalog for an e-commerce platform with highly variable attributes per category. Would you recommend a relational database or a NoSQL database? Justify your choice.

#SQL #NoSQL #System Design
Practice
Backend Engineer • Technical • easy

Given a list of Employee objects, write a Java 8 Stream pipeline to filter employees older than 30, extract their names, and collect them into a comma-separated string.

#Java 8 #Streams
Practice
Backend Engineer • Technical • medium

Explain the difference between standard Threads and CompletableFuture in Java. How would you chain multiple asynchronous API calls?

#Java #Concurrency #Multithreading
Practice
Backend Engineer • Technical • hard

In a microservices architecture, how do you decide between using synchronous communication (like REST/Feign) versus asynchronous communication (like Kafka/RabbitMQ)?

#Microservices #Kafka #REST
Practice
Backend Engineer • Technical • medium

Explain how the @Transactional annotation works in Spring Boot. What happens if a transactional method calls another transactional method within the same class?

#Spring Boot #Transactions #AOP
Practice
Cloud Engineer • Behavioral • medium

Tell me about a time you had to work with a globally distributed team to resolve a critical technical issue.

#Communication #Global Delivery Model
Practice
Cloud Engineer • Behavioral • medium

Tell me about a time you had to convince a reluctant client to adopt a modern cloud practice (like IaC or CI/CD).

#Client Communication #Persuasion #Culture Fit
Practice
Cloud Engineer • Behavioral • medium

Describe a situation where you made a mistake that caused an outage. How did you handle it and what was the post-mortem?

#Accountability #Incident Management
Practice
Cloud Engineer • Behavioral • medium

Capgemini often works with tight deadlines. Tell me about a time you had to deliver a complex cloud solution under immense time pressure.

#Time Management #Prioritization #Agile
Practice
Cloud Engineer • Behavioral • easy

How do you stay updated with the rapidly changing cloud ecosystem (AWS/Azure updates)?

#Self-Improvement #Cloud Trends
Practice
Cloud Engineer • Coding • medium

Given a log file with various HTTP status codes, write a bash command or Python script to find the top 5 IP addresses that received 500 Internal Server Error.

#Bash #Linux #Log Parsing
Practice
Cloud 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 Maps
Practice
Cloud Engineer • Coding • medium

Write a script to interact with a REST API, fetch JSON data with pagination, and extract specific fields into a CSV.

#Python #API #Data Processing
Practice
Cloud Engineer • Coding • medium

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

#Stacks #Strings
Practice
Cloud Engineer • Coding • medium

Write a Python script to list all stale AWS EBS volumes (unattached for > 30 days) and delete them.

#Python #Boto3 #AWS
Practice
Cloud Engineer • System Design • medium

Explain how you would design a highly available, fault-tolerant architecture in AWS for a 3-tier web application.

#AWS #High Availability #Auto Scaling #Load Balancing
Practice
Cloud Engineer • System Design • hard

Design a Disaster Recovery (DR) strategy for a mission-critical cloud application with an RPO of 5 minutes and an RTO of 1 hour.

#Architecture #RPO/RTO #Multi-Region
Practice
Cloud Engineer • System Design • hard

A client wants to migrate their legacy monolithic on-premise application to Azure. Walk me through your migration strategy.

#Azure #Migration Strategies #Consulting
Practice
Cloud Engineer • Technical • hard

How do you handle Terraform state management in a multi-developer, multi-environment setup? What happens if the state file gets corrupted?

#Terraform #State Management #Collaboration
Practice
Cloud Engineer • Technical • hard

Explain how you would trace a request end-to-end across a distributed microservices architecture.

#Distributed Tracing #Microservices #OpenTelemetry
Practice
Cloud Engineer • Technical • easy

What metrics do you consider most critical when setting up monitoring for a cloud-native application?

#Monitoring #Prometheus #SRE
Practice
Cloud Engineer • Technical • medium

How do you troubleshoot a '502 Bad Gateway' error between an Ingress controller and a backend pod?

#Kubernetes #Ingress #Networking
Practice
Cloud Engineer • Technical • medium

You receive a P1 alert that a database connection pool is exhausted. What are your immediate steps?

#Databases #Troubleshooting #Incident Response
Practice
Cloud Engineer • Technical • hard

A microservice deployed on EKS is randomly crashing with OOMKilled errors, but the node has plenty of memory. How do you troubleshoot?

#Kubernetes #EKS #Performance
Practice
Cloud Engineer • Technical • medium

What is AWS GuardDuty, and how would you automate the response to a high-severity finding?

#AWS #GuardDuty #Automation
Practice
Cloud Engineer • Technical • hard

How do you implement network segmentation and micro-segmentation in a Kubernetes cluster?

#Kubernetes #Network Policies #Security
Practice
Cloud Engineer • Technical • medium

Explain the use of Azure Private Link vs Service Endpoints.

#Azure #Security #Networking
Practice
Cloud Engineer • Technical • hard

A client's cloud bill spiked by 40% last month. How do you investigate and remediate this?

#Cost Optimization #AWS Cost Explorer #Azure Cost Management
Practice
Cloud Engineer • Technical • medium

How do you enforce least privilege access in AWS IAM? Explain the evaluation logic of IAM policies.

#AWS #IAM #Security
Practice
Cloud Engineer • Technical • easy

How do you build a Docker image that is optimized for size and security?

#Docker #Security #Optimization
Practice
Cloud Engineer • Technical • medium

Explain the concept of GitOps. How does ArgoCD or Flux differ from traditional push-based CI/CD?

#GitOps #Kubernetes #ArgoCD
Practice
Cloud Engineer • Technical • medium

What are Terraform provisioners, and why does HashiCorp recommend using them as a last resort?

#Terraform #Best Practices
Practice
Cloud Engineer • Technical • hard

You are writing a Terraform module for a client. How do you implement dynamic blocks and use `for_each` vs `count`?

#Terraform #Coding
Practice
Cloud Engineer • Technical • medium

Walk me through a Jenkins or GitLab CI/CD pipeline you built from scratch. How did you handle rollbacks?

#Jenkins #GitLab #Pipelines #Rollbacks
Practice
Cloud Engineer • Technical • hard

Explain how Kubernetes handles networking. How do Pods communicate across different nodes?

#Kubernetes #Networking #CNI
Practice
Cloud Engineer • Technical • medium

How do you manage secrets and sensitive data in a CI/CD pipeline deploying to Kubernetes?

#Kubernetes #Secrets Management #CI/CD
Practice
Cloud Engineer • Technical • medium

What is the difference between AWS Fargate and EC2 for running ECS/EKS workloads?

#AWS #Containers #Serverless
Practice
Cloud Engineer • Technical • hard

Describe how you would set up a Hub and Spoke network topology in Azure. How do you route traffic between spokes?

#Azure #VNet Peering #Network Topology
Practice
Cloud Engineer • Technical • medium

How do you secure a public-facing S3 bucket while still allowing a specific CloudFront distribution to access its contents?

#AWS #S3 #CloudFront #Security
Practice
Cloud Engineer • Technical • medium

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

#AWS #Load Balancing #Networking
Practice
Data Engineer • Behavioral • medium

How do you handle changing data requirements from a client midway through an Agile sprint?

#Agile #Adaptability #Client Management
Practice
Data Engineer • Behavioral • medium

Tell me about a time you had to explain a complex technical data pipeline issue to a non-technical client stakeholder.

#Communication #Consulting
Practice
Data Engineer • Behavioral • hard

Tell me about a time you disagreed with a senior architect's design choice for a data pipeline. How did you resolve the disagreement?

#Conflict Resolution #Technical Leadership
Practice
Data Engineer • Behavioral • medium

Describe a situation at a previous client where you had a very tight deadline for a data migration project. How did you prioritize your tasks?

#Time Management #Agile
Practice
Data Engineer • Behavioral • medium

Describe a time you proactively identified a performance bottleneck in a production data pipeline and fixed it without being asked.

#Proactivity #Problem Solving
Practice
Data Engineer • Coding • medium

Write a SQL MERGE statement to implement Slowly Changing Dimension (SCD) Type 2 logic for a customer dimension table.

#Data Warehousing #SCD Type 2 #MERGE Statement
Practice
Data Engineer • Coding • easy

Write a Python function to check if a given string is a valid palindrome, ignoring spaces, case, and special characters.

#Python #String Manipulation
Practice
Data Engineer • Coding • hard

Write PySpark code to flatten a deeply nested JSON schema into a flat tabular DataFrame.

#PySpark #Complex Data Types #JSON
Practice
Data Engineer • Coding • medium

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

#Window Functions #DENSE_RANK #CTEs
Practice
Data Engineer • Coding • medium

Write a PySpark script to read a CSV file, drop rows with nulls in a specific column, and write the output to Parquet partitioned by a date column.

#PySpark #DataFrames #I/O Operations
Practice
Data Engineer • Coding • hard

Write a SQL query to identify users who have logged in for 3 or more consecutive days.

#Advanced SQL #Self Joins #LEAD/LAG #Date Functions
Practice
Data Engineer • Coding • medium

Given a PySpark DataFrame, how do you find the second most frequent item in a specific column?

#PySpark #Aggregations #Window Functions
Practice
Data Engineer • Coding • medium

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

#Python #File I/O #Memory Management
Practice
Data Engineer • Coding • medium

Implement a Python function to find the length of the longest substring without repeating characters.

#Python #Sliding Window
Practice
Data Engineer • System Design • medium

How would you implement Change Data Capture (CDC) in a modern cloud data stack?

#CDC #Data Architecture #Streaming
Practice
Data Engineer • System Design • hard

Design a real-time streaming pipeline for IoT sensor data using Azure services.

#Azure #Streaming #IoT #Architecture
Practice
Data Engineer • System Design • medium

Design a data model for a retail client migrating their legacy on-premise data warehouse to Snowflake.

#Data Modeling #Snowflake #Cloud Migration
Practice
Data Engineer • Technical • hard

What is the Global Interpreter Lock (GIL) in Python, and how does it affect multithreading in data processing tasks?

#Python #Concurrency
Practice
Data Engineer • Technical • medium

Explain generators and decorators in Python. Provide a practical use case for a data engineering pipeline.

#Python #Advanced Python
Practice
Data Engineer • Technical • easy

Explain the exact differences between RANK(), DENSE_RANK(), and ROW_NUMBER() with a practical example.

#Window Functions #Data Ranking
Practice
Data Engineer • Technical • medium

You have a slow-running SQL query with multiple joins on large tables. Walk me through your step-by-step approach to optimize it.

#Performance Tuning #Execution Plans #Indexing
Practice
Data Engineer • Technical • hard

How does Apache Spark handle data skewness? Explain techniques like salting.

#PySpark #Performance Optimization #Data Skew
Practice
Data Engineer • Technical • easy

What is the difference between narrow and wide transformations in Spark? Give examples of each.

#PySpark #Spark Architecture #Transformations
Practice
Data Engineer • Technical • medium

Explain Broadcast Hash Join and Sort Merge Join in Spark. When would you use one over the other?

#PySpark #Joins #Optimization
Practice
Data Engineer • Technical • medium

How do you manage memory in PySpark? Explain the difference between cache() and persist().

#PySpark #Memory Management
Practice
Data Engineer • Technical • hard

Explain the Catalyst Optimizer in Spark. What are its main phases?

#Spark Architecture #Catalyst Optimizer
Practice
Data Engineer • Technical • medium

How do you handle the 'small files problem' in Spark and HDFS/Cloud Storage?

#PySpark #Storage Optimization
Practice
Data Engineer • Technical • easy

What is the difference between repartition() and coalesce() in PySpark?

#PySpark #Partitioning
Practice
Data Engineer • Technical • easy

Explain the differences between a Star Schema and a Snowflake Schema. What are the pros and cons of each?

#Data Warehousing #Dimensional Modeling
Practice
Data Engineer • Technical • medium

What are Slowly Changing Dimensions? Explain Type 1, Type 2, and Type 3 with examples.

#Data Warehousing #SCD
Practice
Data Engineer • Technical • medium

How do you pass parameters dynamically between activities and pipelines in Azure Data Factory (ADF)?

#Azure Data Factory #Pipeline Orchestration
Practice
Data Engineer • Technical • medium

Explain the architecture of Databricks. What is the difference between the control plane and the data plane?

#Databricks #Cloud Architecture
Practice
Data Engineer • Technical • easy

How do you handle pipeline failures, retries, and alerting in Azure Data Factory?

#Azure Data Factory #Error Handling
Practice
Data Engineer • Technical • medium

Describe the Medallion Architecture (Bronze, Silver, Gold) commonly used in Databricks.

#Databricks #Data Lakehouse #Medallion Architecture
Practice
Data Engineer • Technical • medium

How do you secure data at rest and in transit in Azure Data Lake Storage Gen2?

#Azure #Data Security
Practice
Data Scientist • Behavioral • medium

Describe a situation where a client provided very messy, undocumented, or incomplete data. How did you proceed?

#Problem Solving #Client Handling #Data Quality
Practice
Data Scientist • Behavioral • medium

Tell me about a time you disagreed with a team member or a lead on the choice of an algorithm or architecture. How did you resolve it?

#Conflict Resolution #Teamwork #Decision Making
Practice
Data Scientist • Behavioral • easy

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

#Prioritization #Consulting #Agile
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 #Model Interpretability #Consulting
Practice
Data Scientist • Behavioral • hard

Describe a time when a model you built failed in production or didn't meet client expectations. What did you learn?

#Failure #Continuous Improvement #Production ML
Practice
Data Scientist • Behavioral • medium

Explain the concept of a p-value to a business stakeholder who has no statistical background.

#Statistics #Stakeholder Management #A/B Testing
Practice
Data Scientist • Coding • easy

Write a Python function using Pandas to merge two datasets on a common key, and explain how you would handle missing values in the resulting DataFrame.

#Pandas #Data Manipulation #Data Cleaning
Practice
Data Scientist • Coding • medium

Write a SQL query using window functions to calculate the 7-day rolling average of sales for each product category.

#SQL #Window Functions #Data Aggregation
Practice
Data Scientist • Coding • medium

Write a SQL query to find the second highest salary by department without using the LIMIT keyword.

#SQL #Subqueries #Window Functions
Practice
Data Scientist • Coding • medium

Given a list of strings, write a Python program to group anagrams together.

#Python #Hash Maps #String Manipulation
Practice
Data Scientist • Coding • medium

Write a Python script to scrape data from a paginated REST API, handle rate limits, and store the results in a SQL database.

#API Integration #Data Engineering #Python
Practice
Data Scientist • Coding • hard

Implement a Python function to calculate the TF-IDF scores for a given corpus of documents from scratch (without using scikit-learn).

#Python #NLP #Math Implementation
Practice
Data Scientist • Coding • hard

Write a SQL query to find users who have logged into an application on 3 consecutive days.

#SQL #Advanced Window Functions #Date Manipulation
Practice
Data Scientist • Coding • medium

Write a Python function to find the longest palindromic substring in a given string.

#Python #Dynamic Programming #String Manipulation
Practice
Data Scientist • System Design • hard

Design a recommendation engine for an e-commerce client. What data would you need, and what algorithms would you use?

#Recommendation Systems #Collaborative Filtering #System Architecture
Practice
Data Scientist • System Design • medium

How would you design a system to automatically classify and route incoming customer support emails using NLP?

#NLP #Text Classification #System Architecture
Practice
Data Scientist • System Design • hard

Design an end-to-end architecture for deploying a churn prediction model on Azure for a telecommunications client.

#Azure #MLOps #Model Deployment
Practice
Data Scientist • System Design • hard

Design a fraud detection system for real-time credit card transactions. Focus on the latency requirements and feature store architecture.

#Real-time Processing #Fraud Detection #Feature Store #Streaming
Practice
Data Scientist • Technical • hard

How does the self-attention mechanism work in Transformer models?

#NLP #Transformers #Attention Mechanism
Practice
Data Scientist • Technical • easy

Explain the difference between RANK(), DENSE_RANK(), and ROW_NUMBER() with a practical example.

#SQL #Window Functions
Practice
Data Scientist • Technical • easy

Explain the difference between Bagging and Boosting. Give an example of an algorithm for each.

#Ensemble Methods #Random Forest #XGBoost
Practice
Data Scientist • Technical • medium

How do you evaluate a clustering model when ground truth labels are not available?

#Unsupervised Learning #Clustering #Evaluation Metrics
Practice
Data Scientist • Technical • medium

Why would you choose XGBoost over a Random Forest for a tabular dataset?

#XGBoost #Random Forest #Model Selection
Practice
Data Scientist • Technical • medium

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

#Dimensionality Reduction #PCA #Feature Engineering
Practice
Data Scientist • Technical • hard

What are the trade-offs between fine-tuning an open-source LLM (like Llama 3) versus using a prompt-engineered proprietary API (like OpenAI GPT-4)?

#LLMs #Fine-tuning #Prompt Engineering #Cloud Architecture
Practice
Data Scientist • Technical • medium

Explain the ROC curve and AUC. When would you use Precision-Recall AUC instead of ROC-AUC?

#Evaluation Metrics #Classification
Practice
Data Scientist • Technical • medium

Explain the architecture of a Retrieval-Augmented Generation (RAG) system. Why is it preferred over fine-tuning for certain enterprise use cases?

#NLP #LLMs #RAG #Vector Databases
Practice
Data Scientist • Technical • easy

What is the difference between batch inference and real-time inference? Give a Capgemini-style consulting use case for each.

#Model Deployment #Inference #Architecture
Practice
Data Scientist • Technical • medium

What is A/B testing, and how do you determine the required sample size for an experiment?

#A/B Testing #Hypothesis Testing #Statistical Significance
Practice
Data Scientist • Technical • medium

How does a Support Vector Machine (SVM) handle non-linear data?

#SVM #Kernel Trick #Math
Practice
Data Scientist • Technical • medium

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

#Data Leakage #Feature Engineering #Model Validation
Practice
Data Scientist • Technical • medium

Explain the concept of Word2Vec. What is the difference between the CBOW and Skip-gram architectures?

#NLP #Word Embeddings #Word2Vec
Practice
Data Scientist • Technical • medium

How do you handle highly imbalanced datasets in a fraud detection project? What metrics would you use to evaluate your model?

#Imbalanced Data #SMOTE #Evaluation Metrics
Practice
Data Scientist • Technical • easy

What are the key differences between L1 (Lasso) and L2 (Ridge) regularization? When would you use one over the other?

#Regularization #Linear Models #Feature Selection
Practice
Data Scientist • Technical • hard

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

#Model Monitoring #Data Drift #Production ML
Practice
DevOps Engineer • Behavioral • easy

How would you explain the value of DevOps to a non-technical C-level executive at a client site?

#Communication #Business Value #DevOps Culture
Practice
DevOps Engineer • Behavioral • medium

Describe a time when you caused a production outage. What happened, and what did you do to resolve and prevent it?

#Incident Management #Accountability #Post-mortem
Practice
DevOps Engineer • Behavioral • medium

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

#Stakeholder Management #Communication #Agile
Practice
DevOps Engineer • Coding • easy

Write a Python function to check if a given string is a palindrome, ignoring spaces and case.

#Python #Strings
Practice
DevOps Engineer • Coding • medium

Write a Python script to parse a large log file, count the occurrences of HTTP 500 errors, and output the top 5 IP addresses causing them.

#Python #Log Parsing #Data Structures
Practice
DevOps Engineer • Coding • medium

Write a Python script that connects to a REST API, fetches a list of servers, and filters out the ones that have a 'status' of 'offline'.

#Python #REST API #JSON
Practice
DevOps Engineer • Coding • easy

Write a Bash script to find all log files in '/var/log' older than 30 days and compress them into a tar archive.

#Bash #Linux #Automation
Practice
DevOps Engineer • System Design • hard

Design a centralized logging architecture for a microservices environment deployed on Kubernetes.

#Logging #ELK #Fluentd #Kubernetes
Practice
DevOps Engineer • System Design • medium

You need to automate the patching of 500 Linux VMs across multiple environments. How would you architect this solution?

#Automation #Ansible #Patch Management
Practice
DevOps Engineer • System Design • hard

Design a highly available, fault-tolerant 3-tier web application architecture on AWS for a retail client expecting high Black Friday traffic.

#AWS #High Availability #Auto Scaling #Load Balancing
Practice
DevOps Engineer • System Design • hard

A client wants to migrate their on-premise infrastructure to Azure. What are the key phases and tools you would use for this migration?

#Azure #Migration #Consulting
Practice
DevOps Engineer • System Design • hard

Design a CI/CD pipeline for a monolithic application that is being gradually strangled into microservices. How do you handle the transition?

#CI/CD #Microservices #Migration
Practice
DevOps Engineer • Technical • medium

What are the four golden signals of monitoring, and how would you implement them using Prometheus and Grafana?

#Monitoring #Prometheus #Grafana
Practice
DevOps Engineer • Technical • medium

Explain how Docker networking works. What is the difference between 'bridge', 'host', and 'none' network modes?

#Docker #Networking
Practice
DevOps Engineer • Technical • hard

Explain the difference between Blue/Green and Canary deployment strategies. In what client scenario would you recommend one over the other?

#Kubernetes #CI/CD #Release Management
Practice
DevOps Engineer • Technical • medium

In Terraform, how do you manage infrastructure across multiple environments (Dev, QA, Prod) using the same code base?

#Terraform #Environment Management
Practice
DevOps Engineer • Technical • medium

How does a Kubernetes Ingress controller work, and how is it different from a LoadBalancer service?

#Kubernetes #Networking #Ingress
Practice
DevOps Engineer • Technical • medium

A Kubernetes pod is stuck in a 'CrashLoopBackOff' state. What commands and steps do you use to diagnose the issue?

#Kubernetes #Troubleshooting #Docker
Practice
DevOps Engineer • Technical • medium

What is the difference between an Ansible Playbook and an Ansible Role? How do you structure a complex automation project?

#Ansible #Automation
Practice
DevOps Engineer • Technical • medium

How do you manage secrets (API keys, database passwords) in a Kubernetes environment?

#Kubernetes #Secret Management #HashiCorp Vault
Practice
DevOps Engineer • Technical • hard

Explain the concept of GitOps. How does a tool like ArgoCD differ from a traditional push-based Jenkins pipeline?

#GitOps #ArgoCD #Kubernetes
Practice
DevOps Engineer • Technical • hard

A Linux server is reporting 'No space left on device', but when you run 'df -h', it shows 40% free space. What is the problem and how do you fix it?

#Linux #Troubleshooting #Filesystems
Practice
DevOps Engineer • Technical • medium

How do you integrate security scanning (DevSecOps) into an Azure DevOps or GitLab pipeline?

#DevSecOps #CI/CD #SonarQube #Trivy
Practice
DevOps Engineer • Technical • medium

What is the difference between 'count' and 'for_each' in Terraform? When would you use 'for_each' over 'count'?

#Terraform #HCL
Practice
DevOps Engineer • Technical • medium

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

#Docker #Optimization #CI/CD
Practice
DevOps Engineer • Technical • medium

In a large enterprise client project, how would you implement and manage Jenkins Shared Libraries to avoid code duplication across 50+ microservice pipelines?

#Jenkins #Groovy #CI/CD #Pipeline as Code
Practice
DevOps Engineer • Technical • hard

At Capgemini, we often manage multiple AWS accounts for a single client. How do you securely configure cross-account access without sharing IAM user credentials?

#AWS IAM #Security #Cross-Account
Practice
DevOps Engineer • Technical • medium

How do you manage Terraform state in a multi-developer team to prevent concurrent modifications and state corruption?

#Terraform #AWS #State Management
Practice
DevOps Engineer • Technical • easy

Explain the difference between 'git merge' and 'git rebase'. When should you avoid using rebase?

#Git #Collaboration
Practice
DevOps Engineer • Technical • medium

A deployment pipeline failed in production during a critical client release. Walk me through your step-by-step troubleshooting process.

#CI/CD #Incident Management #Logs
Practice
DevOps Engineer • Technical • hard

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

#Databases #CI/CD #Flyway #Liquibase
Practice
DevOps Engineer • Technical • hard

What are the key differences between AWS Transit Gateway and VPC Peering? When would you use Transit Gateway?

#AWS #Networking #Enterprise Architecture
Practice
DevOps Engineer • Technical • hard

How do you configure Role-Based Access Control (RBAC) in Kubernetes? Explain Roles, ClusterRoles, and RoleBindings.

#Kubernetes #RBAC #Security
Practice
DevOps Engineer • Technical • hard

A Linux server has a high load average but low CPU utilization. What could be causing this, and how do you investigate?

#Linux #Performance Tuning #Troubleshooting
Practice
DevOps Engineer • Technical • medium

Why might you choose Terraform over native cloud IaC tools like AWS CloudFormation or Azure ARM/Bicep?

#Terraform #CloudFormation #Bicep
Practice
Frontend Engineer • Behavioral • medium

Describe your experience working in an Agile/Scrum environment. How do you approach estimating story points for a complex, vaguely defined frontend feature?

#Agile #Scrum #Estimation
Practice
Frontend Engineer • Behavioral • easy

How do you handle disagreements with a backend developer regarding the design of an API contract?

#Collaboration #Teamwork #API Design
Practice
Frontend Engineer • Behavioral • medium

Describe a situation where you had to quickly learn a new frontend framework or library for a client project. What was your approach?

#Adaptability #Continuous Learning
Practice
Frontend Engineer • Behavioral • medium

Tell me about a time you had to push back on a client's unrealistic deadline or feature request. How did you handle the communication?

#Communication #Client Management #Conflict Resolution
Practice
Frontend Engineer • Behavioral • hard

Explain a time you identified a major performance bottleneck in a legacy application. How did you convince stakeholders to allocate time to fix it?

#Problem Solving #Stakeholder Management #Technical Debt
Practice
Frontend Engineer • Behavioral • medium

Tell me about a time you mentored a junior developer on your team who was struggling with modern JavaScript concepts or React.

#Mentorship #Empathy #Team Building
Practice
Frontend Engineer • Coding • medium

What is the difference between Debounce and Throttle? Implement a debounce function from scratch.

#Performance Optimization #Higher-Order Functions #Timers
Practice
Frontend Engineer • Coding • medium

Implement a polyfill for `Promise.all`. How does your implementation handle a mix of resolved promises, rejected promises, and non-promise values?

#Promises #Asynchronous JavaScript #Polyfills
Practice
Frontend Engineer • Coding • medium

Write a JavaScript function to deep clone a nested object. You cannot use `JSON.parse(JSON.stringify())` or external libraries like Lodash.

#Recursion #Data Structures #Object Manipulation
Practice
Frontend Engineer • Coding • medium

Implement a custom polyfill for the `Function.prototype.bind` method.

#Context (this) #Polyfills #Prototypes
Practice
Frontend Engineer • Coding • medium

Build a custom React hook called `useFetch` that takes a URL and returns `data`, `loading`, and `error` states. It should also handle component unmounting to prevent memory leaks.

#Custom Hooks #API Integration #Cleanup Functions
Practice
Frontend Engineer • Coding • medium

Implement a paginated data table component in React. It should fetch data from a mock API, display 10 rows per page, and include 'Next' and 'Previous' buttons.

#Component Design #Pagination #State Management
Practice
Frontend Engineer • Coding • hard

Write a React component that renders a nested folder tree structure from a deeply nested JSON object. The folders should be collapsible.

#Recursive Components #State Management #UI/UX
Practice
Frontend Engineer • Coding • medium

Explain the difference between CSS Grid and Flexbox. Write the CSS to build a responsive layout with a sticky header, a 250px sidebar, and a fluid content area.

#CSS Grid #Flexbox #Responsive Design
Practice
Frontend Engineer • Coding • medium

Write a unit test using Jest and React Testing Library for a Login form component. Test that an error message appears if the user submits empty fields.

#Jest #React Testing Library #Unit Testing
Practice
Frontend Engineer • Coding • medium

Convert a given JavaScript React component that accepts a generic data object into strict TypeScript. Explain how you would use Generics to make the component reusable.

#TypeScript #Generics #React
Practice
Frontend Engineer • System Design • medium

Design an autocomplete/typeahead search component. Discuss API debouncing, caching previous searches, and ensuring accessibility.

#Component Design #Performance #Accessibility
Practice
Frontend Engineer • System Design • hard

Design a scalable frontend architecture for a financial trading dashboard that receives high-frequency real-time stock updates.

#High Performance #WebSockets #Data Visualization
Practice
Frontend Engineer • System Design • hard

Design the frontend architecture for a real-time collaborative text editor (similar to Google Docs). Focus on state synchronization and conflict resolution.

#Real-time Systems #WebSockets #Operational Transformation
Practice
Frontend Engineer • System Design • medium

Design an e-commerce Product Listing Page (PLP). Discuss how you would handle complex filtering, sorting, and infinite scrolling on the frontend.

#Architecture #Pagination #State Management
Practice
Frontend Engineer • System Design • hard

A large enterprise client wants to migrate their monolithic frontend to Micro-frontends. How would you architect this using Webpack Module Federation?

#Micro-frontends #Webpack #Architecture
Practice
Frontend Engineer • Technical • medium

Describe the differences between LocalStorage, SessionStorage, and Cookies. Which mechanism is best for storing JWT tokens in a secure enterprise application?

#Storage #Security #Authentication
Practice
Frontend Engineer • Technical • hard

How do you configure Webpack from scratch to bundle a React application? Explain the roles of entry, output, loaders (Babel, CSS), and plugins.

#Webpack #Build Tools #Babel
Practice
Frontend Engineer • Technical • easy

What are Semantic HTML tags and why are they critical for Web Accessibility (a11y)? How would you make a custom dropdown component accessible?

#Accessibility #Semantic HTML #ARIA
Practice
Frontend Engineer • Technical • medium

Explain the difference between Unit, Integration, and End-to-End (E2E) testing. When would you choose to write a Cypress test over a Jest test?

#Testing Strategy #Cypress #Jest
Practice
Frontend Engineer • Technical • medium

How do you handle React performance optimization in a large-scale client application? Discuss code splitting, lazy loading, and bundle size reduction.

#Performance Optimization #Code Splitting #Webpack
Practice
Frontend Engineer • Technical • medium

Compare Context API and Redux. If you were building a multi-step onboarding flow for a banking client, which would you choose for state management and why?

#State Management #Redux #Context API #Architecture
Practice
Frontend Engineer • Technical • hard

How does React's Virtual DOM work? Explain the reconciliation process and how the Fiber architecture optimizes rendering for large-scale applications.

#Virtual DOM #Reconciliation #React Fiber
Practice
Frontend Engineer • Technical • medium

In React, what is the difference between `useMemo` and `useCallback`? Give a scenario in a complex enterprise dashboard where misusing them could actually degrade performance.

#React Hooks #Performance Optimization #Memoization
Practice
Frontend Engineer • Technical • medium

Explain closures in JavaScript. Can you write a practical example of currying a function that calculates discounts for an e-commerce client?

#Closures #Functional Programming #Currying
Practice
Frontend Engineer • Technical • hard

Explain the JavaScript Event Loop. Given a code snippet with `console.log`, `setTimeout`, and `Promise.resolve`, predict the exact execution order and explain why.

#Event Loop #Microtasks #Macrotasks
Practice
Frontend Engineer • Technical • medium

In TypeScript, what is the difference between `interface` and `type`? When would you choose one over the other in a React application?

#TypeScript #Type System
Practice
Frontend Engineer • Technical • easy

Explain Event Delegation in JavaScript. Write a short snippet to handle click events on a dynamically growing list of items without attaching an event listener to every single `<li>`.

#DOM Manipulation #Event Bubbling #Event Delegation
Practice
Frontend Engineer • Technical • hard

A client's e-commerce site is loading very slowly. How do you analyze and optimize the Critical Rendering Path?

#Performance #Critical Rendering Path #Core Web Vitals
Practice
Frontend Engineer • Technical • medium

Explain Cross-Origin Resource Sharing (CORS). How do you resolve CORS errors when developing a frontend locally against a remote client API?

#Security #CORS #Network Protocols
Practice
Full Stack Engineer • Behavioral • medium

How do you handle scope creep when a client requests new features during an active Agile sprint?

#Agile #Project Management #Client Management
Practice
Full Stack Engineer • Behavioral • easy

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

#Adaptability #Continuous Learning
Practice
Full Stack Engineer • Behavioral • hard

Tell me about a critical production outage you were involved in. What was your role in resolving it?

#Incident Management #Problem Solving #Under Pressure
Practice
Full Stack Engineer • Behavioral • medium

As a Full Stack Engineer, how do you ensure high code quality and maintainability within your development team?

#Code Quality #Mentorship #Best Practices
Practice
Full Stack Engineer • Behavioral • medium

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

#Communication #Client Management #Conflict Resolution
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

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

#Strings #Stack
Practice
Full Stack Engineer • Coding • medium

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

#Arrays #Sorting
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

Reverse a singly linked list.

#Linked Lists #Pointers
Practice
Full Stack Engineer • Coding • medium

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

#JavaScript #Closures #Timers
Practice
Full Stack Engineer • System Design • hard

Design a real-time chat application like Microsoft Teams. How do you ensure messages are delivered in real-time?

#WebSockets #Real-time #Scalability
Practice
Full Stack Engineer • System Design • medium

How do you handle rate limiting in a public-facing API to prevent abuse?

#API Gateway #Security #Algorithms
Practice
Full Stack Engineer • System Design • medium

Design a URL Shortener service like Bitly. Focus on the database schema and the URL generation algorithm.

#Scalability #Hashing #Database Design
Practice
Full Stack Engineer • System Design • hard

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

#Distributed Systems #Microservices #Transactions
Practice
Full Stack Engineer • System Design • hard

Design a microservices architecture for an e-commerce platform. How would you handle service discovery and API routing?

#Microservices #Architecture #API Gateway
Practice
Full Stack Engineer • System Design • medium

How would you implement authentication and authorization across multiple microservices?

#Security #Microservices #JWT
Practice
Full Stack Engineer • Technical • medium

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

#SQL #Subqueries
Practice
Full Stack Engineer • Technical • hard

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

#Hibernate #JPA #Performance
Practice
Full Stack Engineer • Technical • medium

How does Garbage Collection work in Java? Can you force garbage collection?

#Java #Memory Management
Practice
Full Stack Engineer • Technical • easy

What are the different bean scopes available in the Spring framework?

#Spring #Dependency Injection
Practice
Full Stack Engineer • Technical • medium

Explain the Node.js Event Loop. How can Node.js handle thousands of concurrent requests if it is single-threaded?

#Node.js #Asynchronous Programming #Architecture
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 • easy

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

#Spring Boot #REST
Practice
Full Stack Engineer • Technical • hard

Explain the internal working of ConcurrentHashMap in Java. How does it differ from a synchronized HashMap?

#Java #Concurrency #Data Structures
Practice
Full Stack Engineer • Technical • medium

What is CORS? How do you resolve CORS issues between a React frontend and a Spring Boot backend?

#CORS #HTTP #Spring Boot
Practice
Full Stack Engineer • Technical • hard

What strategies would you use to optimize a slow-loading enterprise React or Angular application?

#Performance #Web Vitals #Lazy Loading
Practice
Full Stack Engineer • Technical • medium

Explain the Redux data flow. When would you choose Redux over the native React Context API?

#React #State Management #Redux
Practice
Full Stack Engineer • Technical • medium

How does the Virtual DOM work in React, and how does the reconciliation process (Diffing algorithm) optimize rendering?

#React #Performance #DOM
Practice
Full Stack Engineer • Technical • easy

Explain the difference between React Hooks and Class Components. Why did React introduce Hooks?

#React #Architecture
Practice
Full Stack Engineer • Technical • medium

What are the key differences between monolithic and microservices architectures? When would you choose a monolith over microservices?

#Monolith #Microservices #Trade-offs
Practice
Full Stack Engineer • Technical • medium

Explain your typical deployment strategy using Docker and Kubernetes. What are Pods and Deployments?

#Docker #Kubernetes #Deployment
Practice
Full Stack Engineer • Technical • medium

Walk me through how you would set up a CI/CD pipeline for a full-stack application.

#CI/CD #Jenkins #GitLab CI
Practice
Full Stack Engineer • Technical • medium

What are ACID properties? How are they implemented in a relational database?

#RDBMS #Transactions
Practice
Full Stack Engineer • Technical • medium

Explain the difference between clustered and non-clustered indexes in a relational database.

#SQL #Indexing #Performance
Practice
Machine Learning Engineer • Behavioral • medium

Describe a project where you had to quickly learn a new technology, cloud service, or ML framework to meet a client's specific requirement.

#Continuous Learning #Consulting
Practice
Machine Learning Engineer • Behavioral • medium

Tell me about a time you disagreed with a senior engineer or solutions architect on a technical approach. How did you handle it?

#Conflict Resolution #Teamwork
Practice
Machine Learning Engineer • Behavioral • easy

Working at Capgemini often means juggling multiple client deliverables. How do you prioritize your tasks when faced with tight, competing deadlines?

#Agile #Prioritization #Consulting
Practice
Machine Learning Engineer • Behavioral • hard

Describe a situation where your ML model performed well in training/testing but failed or degraded in production. How did you troubleshoot and resolve it?

#Debugging #Production Issues #Experience
Practice
Machine Learning Engineer • Behavioral • medium

Tell me about a time you had to explain a complex Machine Learning model to a non-technical stakeholder or client.

#Stakeholder Management #Consulting #Explainable AI
Practice
Machine Learning Engineer • Behavioral • easy

Why do you want to work at Capgemini, and how do you think working in IT consulting differs from working at a traditional product company?

#Company Knowledge #Consulting Mindset
Practice
Machine Learning Engineer • Coding • medium

Write a Python function to merge overlapping intervals from a list of time intervals.

#Python #Arrays #Sorting
Practice
Machine Learning Engineer • Coding • hard

Write a Python function to calculate the TF-IDF scores for a given list of text documents without using Scikit-Learn.

#Python #NLP #Math
Practice
Machine Learning Engineer • Coding • medium

Find the top K most frequent elements in an array of user interaction logs.

#Python #Heaps #Hash Maps
Practice
Machine Learning Engineer • Coding • hard

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

#Python #NumPy #Machine Learning Algorithms
Practice
Machine Learning Engineer • Coding • easy

Given a Pandas DataFrame containing client transaction data with missing values, write code to impute missing numeric values with the median and categorical values with the mode.

#Python #Pandas #Data Cleaning
Practice
Machine Learning Engineer • Coding • easy

Write a Python script to extract specific entities (like dates and amounts) from a text string using Regular Expressions.

#Python #Regex #Text Processing
Practice
Machine Learning Engineer • Coding • medium

Write a SQL query to calculate the 7-day rolling average of daily sales for a retail client.

#SQL #Window Functions #Time Series
Practice
Machine Learning Engineer • Coding • medium

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

#SQL #Window Functions #Ranking
Practice
Machine Learning Engineer • System Design • hard

A client wants to deploy a Large Language Model (LLM) for an internal knowledge base but is highly concerned about data privacy. How do you design this?

#LLMs #RAG #Data Privacy #Security
Practice
Machine Learning Engineer • System Design • medium

Design a system to predict customer churn for a telecommunications company. What features would you use and how would you serve the predictions?

#Tabular Data #Classification #Feature Engineering
Practice
Machine Learning Engineer • System Design • medium

Design a document extraction system to automatically parse and extract key fields from scanned invoices using OCR and NLP.

#Computer Vision #NLP #OCR
Practice
Machine Learning Engineer • System Design • medium

How would you design an end-to-end MLOps pipeline on AWS or Azure for a model that needs weekly retraining?

#MLOps #Cloud #CI/CD
Practice
Machine Learning Engineer • System Design • hard

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

#Fraud Detection #Streaming #Real-time Processing
Practice
Machine Learning Engineer • System Design • hard

Design a personalized recommendation system for a large retail client's e-commerce platform.

#Recommendation Systems #Collaborative Filtering #Scalability
Practice
Machine Learning Engineer • Technical • medium

Explain the difference between Bagging and Boosting. Give examples of algorithms for each.

#Ensemble Methods #Random Forest #XGBoost
Practice
Machine Learning Engineer • Technical • easy

Explain the architectural differences between Batch inference and Real-time inference. When would you use which?

#Inference #Architecture #Deployment
Practice
Machine Learning Engineer • Technical • medium

What is MLflow, and how have you used it in the machine learning lifecycle?

#MLflow #Experiment Tracking #Model Registry
Practice
Machine Learning Engineer • Technical • medium

Walk me through the steps of containerizing a Python machine learning model using Docker for deployment.

#Docker #Deployment #Containerization
Practice
Machine Learning Engineer • Technical • hard

Explain the vanishing gradient problem in deep neural networks and how architectures like LSTMs or ResNets solve it.

#Neural Networks #Backpropagation #Architecture
Practice
Machine Learning Engineer • Technical • medium

What is the difference between generative and discriminative models? Provide examples of each.

#Generative AI #Classification #Statistics
Practice
Machine Learning Engineer • Technical • hard

How do you optimize a Deep Learning model that is taking too long to train on a cloud GPU instance?

#Optimization #GPU #PyTorch/TensorFlow
Practice
Machine Learning Engineer • Technical • medium

Explain the ROC curve and AUC. In what scenario would you prefer to use the Precision-Recall curve over ROC?

#Metrics #Classification
Practice
Machine Learning Engineer • Technical • medium

What is the difference between data drift and concept drift? How do you monitor for them in a production MLOps pipeline?

#Model Monitoring #Data Drift #Production ML
Practice
Machine Learning Engineer • Technical • medium

How do you evaluate an unsupervised clustering model when ground truth labels are not available?

#Clustering #Model Evaluation #Unsupervised Learning
Practice
Machine Learning Engineer • Technical • hard

Explain the architecture of a Transformer model and how the self-attention mechanism works.

#NLP #Transformers #Attention Mechanism
Practice
Machine Learning Engineer • Technical • medium

What are the mathematical and practical differences between L1 (Lasso) and L2 (Ridge) regularization?

#Regularization #Linear Models #Feature Selection
Practice
Machine Learning Engineer • Technical • hard

How does XGBoost handle missing values under the hood?

#XGBoost #Missing Data #Tree Algorithms
Practice
Machine Learning Engineer • Technical • medium

How do you handle highly imbalanced datasets in a classification problem for a fraud detection client?

#Data Imbalance #Classification #Fraud Detection
Practice
Machine Learning Engineer • Technical • easy

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

#Model Evaluation #Overfitting #Underfitting
Practice
Product Manager • Behavioral • medium

Tell me about a time you had to manage conflicting priorities between a client's business stakeholders and their internal IT department.

#Conflict Resolution #Client Management #Alignment
Practice
Product Manager • Behavioral • medium

Tell me about a time you used data to influence a senior executive's decision or change a client's mind.

#Influence #Data Analytics #Executive Communication #Storytelling
Practice
Product Manager • Behavioral • easy

Why do you want to work as a Product Manager at a technology consulting firm like Capgemini rather than a traditional B2C tech product company?

#Motivation #Consulting #Career Goals #B2B
Practice
Product Manager • Behavioral • medium

Describe a time you took a calculated risk on a product feature. What was the outcome?

#Risk Management #Decision Making #Innovation
Practice
Product Manager • Behavioral • medium

How do you stay updated with the latest technology trends (e.g., GenAI, Edge Computing) and apply them to solve client problems?

#Continuous Learning #GenAI #Innovation #Tech Trends
Practice
Product Manager • Behavioral • medium

Tell me about a time you had to say 'no' to a key stakeholder or a major client. How did you maintain the relationship?

#Prioritization #Communication #Pushback #Diplomacy
Practice
Product Manager • Behavioral • hard

How do you handle scope creep during a fixed-bid, fixed-timeline client project?

#Scope Management #Client Negotiation #Agile #Contracting
Practice
Product Manager • Behavioral • medium

Tell me about a time a product or feature launch failed. What happened, and what did you learn?

#Failure #Retrospective #Growth Mindset #Accountability
Practice
Product Manager • Behavioral • medium

A client is insisting on a feature that you and the engineering lead know will not scale well and will introduce massive technical debt. How do you handle this?

#Pushback #Technical Debt #Communication #Negotiation
Practice
Product Manager • Behavioral • easy

You are managing a distributed team with developers in India, designers in Europe, and the client in the US. How do you ensure alignment and velocity?

#Offshore Teams #Communication #Agile Ceremonies #Asynchronous Work
Practice
Product Manager • Behavioral • medium

Describe a time you had to pivot a product roadmap due to changing market conditions or sudden client budget cuts.

#Roadmapping #Agile #Change Management #Resilience
Practice
Product Manager • Coding • easy

Write a SQL query to find the top 5 clients by total revenue generated in the last quarter.

#SQL #Aggregation #Sorting #Date Functions
Practice
Product Manager • Coding • medium

Write a SQL query to identify users who have logged in more than 3 times in the past 7 days but haven't made a purchase.

#SQL #Filtering #Subqueries #Joins
Practice
Product Manager • Coding • hard

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

#SQL #Self Joins #Cohort Analysis #Window Functions
Practice
Product Manager • System Design • medium

Design a dashboard for a retail client to track supply chain anomalies and inventory shortages.

#UI/UX #B2B #Supply Chain #Data Visualization
Practice
Product Manager • System Design • medium

Design a recommendation engine for an e-commerce client. What data points would you collect, and how would you measure its success?

#Machine Learning #E-commerce #Data Pipelines #Personalization
Practice
Product Manager • System Design • hard

Design an automated invoice processing system for a client using OCR and Machine Learning. Walk me through the user journey and system components.

#AI/ML #Automation #Process Design #OCR
Practice
Product Manager • System Design • hard

How would you design an API rate-limiting feature for a B2B data platform to prevent abuse while ensuring enterprise clients get their contracted quotas?

#APIs #Security #Scalability #Throttling
Practice
Product Manager • System Design • hard

A client wants to migrate their on-premise CRM to AWS. What are the key product and business considerations you need to address?

#Cloud Migration #AWS #Risk Management #Data Security
Practice
Product Manager • System Design • hard

Design a high-level system architecture for a ride-sharing app's surge pricing feature.

#Architecture #Scalability #Algorithms #Real-time Data
Practice
Product Manager • Technical • medium

How would you price a new SaaS product developed specifically for our Tier-1 financial services clients?

#Pricing #B2B SaaS #Go-to-market #Financial Services
Practice
Product Manager • Technical • hard

Capgemini is building a new internal Generative AI tool to assist developers with code generation. How would you define the MVP?

#AI/ML #MVP #Internal Tools #Developer Experience
Practice
Product Manager • Technical • medium

What metrics would you track to evaluate the success of a newly launched AI chatbot for a telecom client's customer support?

#Chatbots #Customer Support #KPIs #AI
Practice
Product Manager • Technical • medium

A major banking client wants to digitize their legacy loan origination process. Walk me through your product discovery phase.

#FinTech #Digital Transformation #User Journey #Process Mapping
Practice
Product Manager • Technical • medium

How do you decide whether to build a custom solution for a client versus integrating an off-the-shelf SaaS product?

#Build vs Buy #Enterprise Architecture #Cost-Benefit Analysis
Practice
Product Manager • Technical • medium

How do you prioritize a product backlog when multiple enterprise clients are requesting different, mutually exclusive features?

#Prioritization Frameworks #RICE #Kano #Roadmapping
Practice
Product Manager • Technical • medium

Walk me through how you write a Product Requirements Document (PRD) for a complex API integration between a client's ERP and a third-party logistics provider.

#PRD #API #Documentation #System Integration
Practice
Product Manager • Technical • hard

How do you measure the success of a digital transformation initiative for a legacy manufacturing client?

#KPIs #Digital Transformation #Success Metrics #Manufacturing
Practice
Product Manager • Technical • medium

Explain your approach to conducting user research when your end-users are internal employees of a client company who are resistant to change.

#B2B Research #Enterprise Users #Change Management #Interviews
Practice
Product Manager • Technical • easy

Explain the difference between REST and GraphQL to a non-technical client stakeholder.

#APIs #REST #GraphQL #Communication
Practice
Product Manager • Technical • medium

The latency of our client-facing portal has increased by 20% over the last week. Walk me through how you would troubleshoot this as a PM.

#Performance #Troubleshooting #Metrics #APM
Practice
Product Manager • Technical • medium

How do you ensure data privacy and GDPR compliance when designing a new healthcare data analytics product?

#GDPR #Data Privacy #Healthcare #HIPAA
Practice
Product Manager • Technical • hard

How do you align a specific product's KPIs with the broader digital transformation goals of an enterprise client?

#OKRs #Digital Transformation #Business Strategy #Alignment
Practice
Product Manager • Technical • medium

Design an A/B test to improve the checkout conversion rate for a retail client's e-commerce platform.

#Experimentation #E-commerce #Conversion Rate #Statistics
Practice
Product Manager • Technical • hard

If user engagement drops by 15% on a client's mobile app immediately after a new release, how do you investigate and resolve the issue?

#Analytics #Debugging #Product Sense #Mobile Apps
Practice
Software Engineer • Behavioral • easy

Describe your experience working in an Agile/Scrum environment. What ceremonies do you find most valuable?

#Agile #Scrum #Teamwork
Practice
Software Engineer • Behavioral • easy

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

#Continuous Learning #Agile #Problem Solving
Practice
Software Engineer • Behavioral • medium

Explain a time when you had to explain a complex technical concept to a non-technical stakeholder.

#Stakeholder Management #Soft Skills
Practice
Software Engineer • Behavioral • medium

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

#Prioritization #Agile #Delivery
Practice
Software Engineer • Behavioral • easy

Why do you want to join Capgemini and how does it align with your career goals?

#Motivation #Career Planning #Company Knowledge
Practice
Software Engineer • Behavioral • medium

Tell me about a time you found a critical bug right before a production release.

#Quality Assurance #Communication #Crisis Management
Practice
Software Engineer • Behavioral • medium

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

#Communication #Conflict Resolution #Client Management
Practice
Software Engineer • Coding • medium

Check if a given binary tree is a valid Binary Search Tree (BST).

#Trees #DFS #Recursion
Practice
Software Engineer • Coding • medium

Write a program to group anagrams from an array of strings.

#Strings #Hash Map #Sorting
Practice
Software Engineer • Coding • medium

Find the longest substring without repeating characters.

#Strings #Sliding Window #Hash Set
Practice
Software Engineer • Coding • easy

Detect a cycle in a linked list.

#Linked Lists #Two Pointers
Practice
Software Engineer • Coding • easy

Merge two sorted linked lists into one sorted linked list.

#Linked Lists #Sorting
Practice
Software Engineer • Coding • medium

Write a program to find the maximum subarray sum (Kadane's Algorithm).

#Arrays #Dynamic Programming
Practice
Software Engineer • Coding • medium

Implement an LRU (Least Recently Used) Cache.

#Hash Map #Doubly Linked List #Design
Practice
Software Engineer • Coding • easy

Find the missing number in an array containing n distinct numbers taken from 0, 1, 2, ..., n.

#Math #Bit Manipulation #Arrays
Practice
Software Engineer • Coding • easy

Write a program to find the second largest element in an array without sorting it.

#Arrays #Optimization
Practice
Software Engineer • Coding • easy

Reverse a string in place without using any built-in reverse functions.

#Strings #Two Pointers
Practice
Software Engineer • System Design • medium

Design a URL shortening service like Bitly.

#Scalability #Hashing #Database Design
Practice
Software Engineer • System Design • medium

Explain how you would implement authentication and authorization in a microservices ecosystem using OAuth2 and JWT.

#OAuth2 #JWT #API Gateway
Practice
Software Engineer • System Design • medium

Design a logging and monitoring strategy for a distributed enterprise application.

#Observability #ELK Stack #Microservices
Practice
Software Engineer • System Design • hard

How would you design a scalable microservices architecture for an e-commerce checkout system?

#Microservices #Event-Driven Architecture #Scalability
Practice
Software Engineer • System Design • hard

Design a rate limiter for a public-facing API.

#API Gateway #Algorithms #Scalability
Practice
Software Engineer • Technical • medium

Explain the difference between map() and flatMap() in Java 8 Streams.

#Java 8 #Streams API #Functional Programming
Practice
Software Engineer • Technical • medium

Explain the Bean lifecycle in the Spring framework.

#Spring Core #Dependency Injection
Practice
Software Engineer • Technical • easy

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

#Spring Boot #REST #Java
Practice
Software Engineer • Technical • easy

What is the difference between == and .equals() in Java?

#Java Basics #Memory Management
Practice
Software Engineer • Technical • medium

What is the CAP theorem and how does it apply to Cassandra vs MongoDB?

#NoSQL #Distributed Systems #CAP Theorem
Practice
Software Engineer • Technical • medium

What are the differences between clustered and non-clustered indexes in a relational database?

#SQL #Indexing #Performance Optimization
Practice
Software Engineer • Technical • medium

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

#Spring Boot #Exception Handling #REST
Practice
Software Engineer • Technical • hard

What is the Saga design pattern and how does it manage distributed transactions in microservices?

#Distributed Systems #Transactions #Architecture
Practice
Software Engineer • Technical • medium

How does the Virtual DOM work in React?

#React #JavaScript #Performance
Practice
Software Engineer • Technical • medium

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

#SQL #Window Functions #Subqueries
Practice
Software Engineer • Technical • medium

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

#Spring Boot #Auto-configuration #Java
Practice
Software Engineer • Technical • medium

How does Garbage Collection work in Java?

#JVM #Memory Management #Garbage Collection
Practice
Software Engineer • Technical • easy

What is Dependency Injection and what are its benefits?

#Design Patterns #Spring #OOP
Practice

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Senior Engineer

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Think Out Loud

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