Cognizant
American multinational information technology services and consulting company.
4 Rounds
~21 Days
Medium
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
•
System Design
•
hard
Design a highly available healthcare patient record API. How do you handle data privacy and compliance (like HIPAA)?
#Security
#High Availability
#Healthcare
Backend Engineer
•
System Design
•
hard
Design a microservices architecture for a banking fund transfer application. How do you ensure ACID properties across services?
#Microservices
#Banking
#ACID
Backend Engineer
•
System Design
•
hard
Design the backend for an E-commerce inventory management system. How do you handle concurrent purchases of the same item?
#Concurrency
#Microservices
#Databases
Backend Engineer
•
System Design
•
hard
Design an API Rate Limiter. What algorithms would you use?
#Algorithms
#Scalability
#Caching
Data Engineer
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System Design
•
medium
Design a CI/CD pipeline for deploying Data Engineering assets (Airflow DAGs, Snowflake SQL scripts, PySpark code).
#CI/CD
#DevOps
#Git
#Jenkins/GitHub Actions
Data Engineer
•
System Design
•
hard
Design a system to ingest and process daily healthcare claims data (HIPAA compliant). The data arrives as CSVs in an SFTP server.
#Healthcare
#Security
#ETL
#Cloud Architecture
Data Engineer
•
System Design
•
hard
Design a real-time streaming pipeline to process clickstream data from a retail client's website and update a live dashboard.
#Streaming
#Kafka
#Spark Streaming
#Real-time Analytics
Data Engineer
•
System Design
•
hard
Design a batch ETL pipeline to migrate 500GB of daily transactional data from an on-premise Oracle database to Snowflake on AWS. What tools and architecture would you use?
#AWS
#Snowflake
#Data Migration
#ETL Architecture
Data Scientist
•
System Design
•
hard
Design the architecture for a real-time credit card fraud detection system that must return a prediction in under 50 milliseconds.
#Real-time Processing
#Latency
#Streaming
Data Scientist
•
System Design
•
hard
Your batch inference pipeline needs to process 10 million records nightly. How do you design this to be scalable and fault-tolerant?
#Batch Processing
#Distributed Computing
#Spark
Data Scientist
•
System Design
•
hard
Design a personalized product recommendation system for a large e-commerce client. Walk me through the data, algorithms, and serving architecture.
#Recommendation Systems
#Collaborative Filtering
#Architecture
Frontend Engineer
•
System Design
•
medium
Design the frontend architecture for an autocomplete/typeahead search widget.
#Component Architecture
#Performance
#State Management
Frontend Engineer
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System Design
•
hard
Design a real-time chat application frontend. Focus on state management, network protocols, and performance.
#WebSockets
#Real-time
#State Management
Frontend Engineer
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System Design
•
hard
Design an e-commerce checkout flow frontend that integrates with multiple third-party payment gateways.
#Architecture
#Security
#Forms
Machine Learning Engineer
•
System Design
•
hard
Design a scalable batch scoring pipeline that needs to process 100 million records every night.
#Batch Processing
#Big Data
#Spark
#Airflow
Machine Learning Engineer
•
System Design
•
hard
Design a personalized product recommendation system for a large e-commerce client. Walk me through the data, model choices, and serving architecture.
#Recommendation Systems
#Architecture
#Scalability
Machine Learning Engineer
•
System Design
•
medium
A client wants to build an internal chatbot to query their proprietary PDF documents. Would you recommend fine-tuning an LLM or using RAG (Retrieval-Augmented Generation)? Why?
#Generative AI
#LLMs
#RAG
#Architecture
Product Manager
•
System Design
•
hard
Design a healthcare patient portal for a major hospital network. What are the key features and how would you ensure HIPAA compliance?
#Healthcare
#Compliance
#User Experience
#Architecture
Product Manager
•
System Design
•
hard
Design an IoT-based fleet management dashboard for a logistics client. What metrics would you display and how would the data flow from trucks to the UI?
#IoT
#Real-time Data
#Dashboard Design
Product Manager
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System Design
•
hard
Design a scalable ticketing system for a global IT helpdesk serving multiple Fortune 500 clients.
#Multi-tenancy
#Scalability
#Workflow Automation
Product Manager
•
System Design
•
hard
Design an automated claims processing system for an insurance client utilizing machine learning for fraud detection.
#Insurance
#Machine Learning
#Automation
Product Manager
•
System Design
•
hard
Design a real-time fraud detection system for an e-commerce payment gateway.
#E-commerce
#Fraud Detection
#Low Latency
Product Manager
•
System Design
•
medium
Design a video streaming platform tailored specifically for corporate training and onboarding.
#Video Streaming
#Enterprise Software
#Content Delivery
Product Manager
•
System Design
•
hard
Design an inventory management system for a retail client that syncs online e-commerce and physical store stock in real-time.
#Omnichannel
#Inventory
#Concurrency
Software Engineer
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System Design
•
medium
Design a microservices architecture for a retail e-commerce application. How do the services communicate?
#Microservices
#API Gateway
#Service Discovery
Software Engineer
•
System Design
•
hard
How would you design a rate limiter for a public-facing API?
#API Gateway
#Algorithms
#Scalability
Software Engineer
•
System Design
•
medium
Design a URL shortener service like Bitly.
#Scalability
#Database Design
#Hashing
Software Engineer
•
System Design
•
hard
Explain the Saga design pattern for distributed transactions in microservices.
#Microservices
#Distributed Systems
#Transactions
Difficulty Radar
Based on recent AI-sourced data.
Meet Your Interviewers
The "Standard" Interviewer
Senior EngineerFocuses on core competencies, system constraints, and clear communication.
SimulateUnwritten Rules
Think Out Loud
Always explain your thought process before writing code or drawing architecture.