TCS SDE2 Interview Guide
Published July 22, 2026 · Updated July 22, 2026
Evidence-backed preparation playbook for TCS SDE2 interviews. 150 reported questions, top topics, difficulty breakdown, and a free assessment.
2-5 years
Most reported exp
Rounds reported
Screening 59qTechnical 52qScenario 19qSystem Design 12qHR 8q
Topics most frequently reported
✓Java / Spring Boot
7 questions · 5%
✓Domain
6 questions · 4%
✓SQL / Window Functions
4 questions · 3%
·React / State Management
3 questions · 2%
·SQL / Indexing
3 questions · 2%
·DevOps / Docker
3 questions · 2%
Free · 10 minutes
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Top Questions — Ranked by Community Votes
These 6 questions appeared most in TCS SDE2 reports. Master these first.
TCS
Medium
Technical round
JavaSpring Boot
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.
↑ 93 upvotes · 36 engineers asked this · SDE2
TCS
Medium
Technical round
2-4 years
A developer puts async code inside useEffect by returning an async arrow function: useEffect(() => async () => {...}). Why is this wrong?
↑ 84 upvotes · 22 engineers asked this · SDE2
TCS
Medium
Screening round
3-6 years
Explain service discovery in microservices. How does Eureka work with Spring Cloud?
↑ 84 upvotes · 32 engineers asked this · SDE2
TCS
Medium
Technical round
2-5 years
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?
↑ 83 upvotes · 41 engineers asked this · SDE2
TCS
Medium
Screening round
2-5 years
What is React.StrictMode and what bugs does it help catch?
↑ 83 upvotes · 21 engineers asked this · SDE2
TCS
Medium
Technical round
2-5 years
Your React app uses React Router. Users report the browser back button doesn't work after programmatic navigation. What are the likely causes?
↑ 81 upvotes · 19 engineers asked this · SDE2
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Frequently asked questions
How hard is the TCS SDE2 interview?
Medium–Hard difficulty based on 150 reported questions. Most questions cover Java / Spring Boot, Domain, SQL / Window Functions.
What topics does TCS ask SDE2s?
Top reported topics: Java / Spring Boot (7 questions), Domain (6 questions), SQL / Window Functions (4 questions), React / State Management (3 questions), SQL / Indexing (3 questions).
How many rounds does TCS have for SDE2?
Reported rounds: Technical, System Design, HR, Scenario, Screening.
What experience level does TCS hire SDE2s at?
Most reported: 2-5 years and 3-6 years.