TCS

TCS

Large multinational IT services and consulting enterprise based in India.

3 Rounds ~14 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

Tell me about a time you had to push back on a client's unrealistic deadline during a sprint. How did you communicate this?

#Communication #Agile #Stakeholder Management
Practice
Backend Engineer • Behavioral • medium

Describe a time when you had a technical disagreement with a senior architect. How did you resolve it?

#Conflict Resolution #Communication #Collaboration
Practice
Backend Engineer • Behavioral • easy

Why do you want to join TCS, and how do your values align with the Tata Code of Conduct?

#Company Knowledge #Ethics #Motivation
Practice
Backend Engineer • Behavioral • medium

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

#Learning #Agility #Problem Solving
Practice
Backend Engineer • Behavioral • medium

How do you handle a production outage caused by a deployment you just made?

#Incident Management #Accountability #Problem Solving
Practice
Backend Engineer • Behavioral • medium

Describe a time when you optimized a legacy system to improve performance for a client.

#Performance Tuning #Legacy Code #Impact
Practice
Backend Engineer • Coding • easy

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

#Arrays #HashMaps
Practice
Backend Engineer • Coding • medium

Write a Java program to find the second highest salary from a list of Employee objects using Java 8 Streams.

#Streams #Lambdas #Sorting
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 • easy

Write a function to detect if a cycle exists in a singly linked list.

#Linked Lists #Two Pointers
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

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

#Strings #HashMaps
Practice
Backend Engineer • Coding • easy

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

#Stacks #Strings
Practice
Backend Engineer • System Design • hard

Design a high-throughput transaction processing system for a retail banking client. How do you handle data consistency?

#Distributed Systems #ACID #Microservices
Practice
Backend Engineer • System Design • medium

Design an API Rate Limiter for a public-facing TCS client portal to prevent DDoS attacks.

#Security #Algorithms #Caching
Practice
Backend Engineer • System Design • medium

Design a notification service that sends Email, SMS, and Push notifications to millions of users.

#Asynchronous Processing #Message Queues #Scalability
Practice
Backend Engineer • System Design • hard

Explain the Saga design pattern. How do you handle rollbacks in a distributed transaction?

#Microservices #Distributed Transactions #Event Driven
Practice
Backend Engineer • System Design • medium

Design a URL Shortener service like Bitly. How do you ensure the generated short URLs are unique?

#Hashing #Scalability #Database Design
Practice
Backend Engineer • System Design • hard

How would you design a distributed cache for a global e-commerce application?

#Caching #Redis #Distributed Systems
Practice
Backend Engineer • Technical • medium

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

#Hibernate #JPA #Database Optimization
Practice
Backend Engineer • Technical • medium

Write a SQL query to find all employees who earn more than their direct managers.

#Self Joins #Query Optimization
Practice
Backend Engineer • Technical • medium

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

#Collections #Multithreading #Concurrency
Practice
Backend Engineer • Technical • medium

How does Spring Boot auto-configuration work under the hood? Explain the role of @EnableAutoConfiguration.

#Spring Boot #Annotations #Framework Internals
Practice
Backend Engineer • Technical • medium

Explain the Bean Lifecycle in the Spring framework. At what point are @PostConstruct methods executed?

#IoC Container #Dependency Injection #Lifecycle Callbacks
Practice
Backend Engineer • Technical • medium

What is the difference between pessimistic and optimistic locking in JPA? When would you use each?

#JPA #Concurrency #Transactions
Practice
Backend Engineer • Technical • medium

Explain the Circuit Breaker pattern. How would you implement it in a Spring Boot microservice?

#Resilience #Fault Tolerance #Design Patterns
Practice
Backend Engineer • Technical • hard

How does Garbage Collection work in Java? What is the difference between G1GC and ZGC?

#JVM #Memory Management #Performance Tuning
Practice
Backend Engineer • Technical • medium

Explain the difference between Kafka and RabbitMQ. When would you choose Kafka for a client project?

#Event Driven Architecture #Kafka #RabbitMQ
Practice
Backend Engineer • Technical • medium

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

#REST #JWT #Authentication
Practice
Backend Engineer • Technical • medium

Explain the CAP theorem. Where does a relational database like PostgreSQL fit, and where does MongoDB fit?

#Distributed Systems #NoSQL #RDBMS
Practice
Backend Engineer • Technical • easy

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

#MVC #REST #Annotations
Practice
Backend Engineer • Technical • hard

How do you implement distributed tracing in a microservices architecture?

#Observability #Logging #Tracing
Practice
Backend Engineer • Technical • medium

Explain indexing in relational databases. How does a B-Tree index work, and when should you NOT use an index?

#Database Optimization #Data Structures
Practice
Backend Engineer • Technical • easy

What is the difference between TRUNCATE, DELETE, and DROP in SQL?

#DDL #DML #Database Basics
Practice
Backend Engineer • Technical • easy

What is the difference between Singleton and Prototype scope in Spring? When would you use Prototype?

#Bean Scopes #IoC Container
Practice

Difficulty Radar

Based on recent AI-sourced data.

Meet Your Interviewers

The "Standard" Interviewer

Senior Engineer

Focuses on core competencies, system constraints, and clear communication.

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Unwritten Rules

Think Out Loud

Always explain your thought process before writing code or drawing architecture.

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