TCS Interview Process 2026 — Rounds, Tips & Questions
Everything about the TCS interview process: rounds, what each round tests, difficulty level, and 167 real questions asked by engineers who cleared the loop.
Interview Rounds at TCS
- TCS NQT / Online test
- Technical interview
- Managerial round
- HR round
TCS NQT tests Aptitude, Verbal, Coding. Technical round focuses on Java/Python basics, OOPs, DBMS, and OS. Be specific about project experience.
Real Questions Asked at TCS
What are the SOLID principles? Explain each with a real-world Java example. Then describe a scenario where rigidly following SOLID leads to over-engineering, and how you balance pragmatism with good design.
Implement a function that checks if a string of brackets is valid. Brackets: (), [], {}. Must handle nested brackets.
A developer puts async code inside useEffect by returning an async arrow function: useEffect(() => async () => {...}). Why is this wrong?
Explain service discovery in microservices. How does Eureka work with Spring Cloud?
Your PostgreSQL query plan shows 'Seq Scan' on a small 1000-row table despite having an index. Why might Postgres choose not to use the index?
What is React.StrictMode and what bugs does it help catch?
Your React app uses React Router. Users report the browser back button doesn't work after programmatic navigation. What are the likely causes?
Explain Docker layer caching. Why do developers often put COPY . . before RUN npm install (wrong) and how to fix it?
What is Spring Boot Actuator? What security risks does it introduce and how do you mitigate them?
Your Node.js API uses async/await throughout. A developer reports that errors thrown in async route handlers are causing the process to crash with 'UnhandledPromiseRejectionWarning'. What's the architectural fix?
Practice these questions with AI feedback
Get instant grading on your answers, identify your weak areas, and generate a personalised 14-day study plan — all free.
Build my study plan →