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

All Roles Backend Engineer 35 Cloud Engineer 34 Data Engineer 35 Data Scientist 35 DevOps Engineer 35 Frontend Engineer 35 Full Stack Engineer 35 Machine Learning Engineer 35 Product Manager 35 Software Engineer 35

All Topics Backend Development 7 Algorithms 5 Frontend Development 5 System Design 5 Architecture 3 Database 2 Culture Fit 2 Leadership 1

Full Stack Engineer • Behavioral • medium

Tell me about a time you had a disagreement with a senior developer or architect regarding a technical choice. How did you resolve it?

#Conflict Resolution #Communication #Teamwork

Practice

Full Stack Engineer • Behavioral • medium

Describe a situation where you had to deliver a critical project under a very tight deadline. How did you manage your time and ensure quality?

#Time Management #Prioritization #Stress Management

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Full Stack Engineer • Behavioral • easy

Why do you want to join TCS? How do your career goals align with the services and culture of Tata Consultancy Services?

#Motivation #Company Knowledge #Career Goals

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Full Stack Engineer • Coding • medium

Write a program to find the longest substring without repeating characters.

#Strings #Sliding Window #Hash Map

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Full Stack Engineer • Coding • easy

Write a SQL query to find the second highest salary of an employee from a given department.

#SQL #Database #Queries

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Full Stack Engineer • Coding • easy

Given an array of integers, write a function to move all zeros to the end while maintaining the relative order of the non-zero elements.

#Arrays #Two Pointers

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Full Stack Engineer • Coding • medium

Write a code to check if a given binary tree is a valid Binary Search Tree (BST).

#Trees #Recursion #DFS

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Full Stack Engineer • Coding • easy

Write a function to reverse a linked list. Follow up: Can you do it recursively?

#Linked Lists #Pointers #Recursion

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Full Stack Engineer • Coding • easy

Given two strings, write a method to determine if they are valid anagrams of each other. Optimize for time and space complexity.

#Strings #Hash Map #Sorting

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Full Stack Engineer • System Design • hard

Explain the Saga design pattern. How would you implement distributed transactions across multiple microservices?

#Microservices #Distributed Systems #Transactions

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Full Stack Engineer • System Design • medium

Design a scalable notification system that sends emails, SMS, and push notifications to millions of users.

#Message Queues #Scalability #Asynchronous Processing

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Full Stack Engineer • System Design • medium

How would you design a URL shortener service like Bitly? Focus on the database schema and read/write scaling.

#Scalability #Database Design #Hashing

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Full Stack Engineer • System Design • hard

Design an e-commerce shopping cart system. How would you handle inventory reservation during the checkout process to prevent overselling?

#Concurrency #Database Locks #E-commerce

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Full Stack Engineer • System Design • hard

Design a rate limiter for a public-facing REST API. What algorithms would you consider?

#API Design #Algorithms #Redis

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Full Stack Engineer • Technical • medium

Explain the internal working of ConcurrentHashMap in Java 8 and how it differs from Hashtable.

#Java #Collections #Multithreading

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Full Stack Engineer • Technical • easy

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

#Spring Boot #REST API #Exception Handling

Practice

Full Stack Engineer • Technical • medium

What is the difference between useMemo and useCallback in React? Give a real-world scenario where you would use them.

#React #Performance Optimization #Hooks

Practice

Full Stack Engineer • Technical • medium

Explain the difference between Subject and BehaviorSubject in RxJS. How do you use them for component communication in Angular?

#Angular #RxJS #State Management

Practice

Full Stack Engineer • Technical • medium

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

#Hibernate #JPA #Database Performance

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Full Stack Engineer • Technical • medium

How does JWT authentication work? What are the security risks associated with storing JWTs in local storage vs HTTP-only cookies?

#Authentication #JWT #Web Security

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Full Stack Engineer • Technical • easy

What are the new features introduced in Java 11 and Java 17 that you have used in your recent projects?

#Java #Language Features

Practice

Full Stack Engineer • Technical • medium

Explain your CI/CD pipeline setup. How do you deploy a containerized Spring Boot and React application to AWS/Azure?

#CI/CD #Docker #Cloud

Practice

Full Stack Engineer • Technical • medium

How does the Virtual DOM work in React, and what is the reconciliation process?

#React #Architecture #Performance

Practice

Full Stack Engineer • Technical • medium

What is an API Gateway? Why is it necessary in a microservices architecture, and what cross-cutting concerns does it handle?

#Microservices #API Gateway #Routing

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Full Stack Engineer • Technical • easy

Explain the concept of Dependency Injection and Inversion of Control. How does Spring implement this?

#Spring #Design Patterns #Core Java

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Full Stack Engineer • Technical • medium

Explain the difference between clustered and non-clustered indexes in SQL Server/PostgreSQL.

#SQL #Indexing #Performance Tuning

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Full Stack Engineer • Technical • easy

What is Cross-Origin Resource Sharing (CORS)? How do you configure a Spring Boot backend to allow requests from a React frontend hosted on a different domain?

#CORS #Spring Boot #Security

Practice

Full Stack Engineer • Technical • medium

How do you create a custom annotation in Java? Provide an example of where you would use one in a Spring Boot application.

#Java #Spring Boot #AOP

Practice

Full Stack Engineer • Technical • medium

Explain the concept of Server-Side Rendering (SSR) vs Client-Side Rendering (CSR). When would you choose one over the other?

#Architecture #Performance #SEO

Practice

Full Stack Engineer • Technical • medium

How do you implement service discovery in a microservices architecture? Explain using Eureka or Consul.

#Microservices #Service Discovery #Spring Cloud

Practice

Full Stack Engineer • Technical • easy

What is your approach to unit testing and integration testing in a full-stack application? Mention the tools you use.

#JUnit #Mockito #Jest #TDD

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Full Stack Engineer • Technical • medium

What are ACID properties in a database? Give an example of how Isolation is maintained during concurrent transactions.

#SQL #Transactions #ACID

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Full Stack Engineer • Technical • medium

Explain the difference between CompletableFuture and traditional Threads/Runnables in Java. How do you handle asynchronous programming?

#Java #Concurrency #Asynchronous

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Full Stack Engineer • Technical • medium

What strategies do you use to optimize the load time and performance of a large-scale single-page application (SPA)?

#Performance #Lazy Loading #Webpack

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Full Stack Engineer • Technical • medium

Explain the difference between Monolithic, Microservices, and Serverless architectures. What factors drive the decision to migrate from a monolith to microservices?

#System Architecture #Cloud #Microservices

Practice

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Senior Engineer

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

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