TCS Interview Questions (With Answers)

1,065 Questions asked

Mar 2026 First seen

Sep 2026 Last seen

1065 Unique questions

🥧 Difficulty mix

How hard are these questions?

Easy 158 (15%)Medium 761 (71%)Hard 146 (14%)

📊 Question type

Breakdown by interview phase

🔥 12-week activity

When candidates are asked these

Last 12 weeks →

🏷️ Top topics

Where these questions cluster

Devops 118

Ai Machine Learning 92

Cloud Devops 88

Databases Sql 59

Data Engineering 57

Javascript Typescript 55

Algorithms Data Structures 51

Java 50

👤 Experience level mix

What seniority these are asked at

Fresher (0-1yr) 156Junior (1-3yr) 5Mid (3-6yr) 759Senior (6+yr) 145

📝 Recent questions

Latest 10 asked by candidates

🟡 Medium ✅

You mentioned using Langgraph for error handling and recovery in LLM workflows. Can you explain how you apply prompt engineering techniques within these workflows to improve the model's performance in real‑world scenarios?

Langgraph Prompt Engineering Error Handling

Conceptual · Asked 1× · Sep 2026

🟡 Medium ✅

How would you move all zeros to the end of an array using a two-pointer approach in one pass, achieving O(n) time and O(1) space?

Array Two-pointer Algorithm

Coding · Asked 1× · Sep 2026

🔴 Hard ✅

Describe how you would automate the deployment of an ETL pipeline built with PySpark to AWS using GitHub Actions and AWS services. Include specifics on the tools and configurations you would use to ensure seamless deployment in testing and monitoring.

Devops Github Actions Aws

Conceptual · Asked 1× · Aug 2026

🟢 Easy ✅

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🥧 Difficulty mix

📊 Question type

🔥 12-week activity

🏷️ Top topics

👤 Experience level mix

📝 Recent questions

You mentioned using Langgraph for error handling and recovery in LLM workflows. Can you explain how you apply prompt engineering techniques within these workflows to improve the model's performance in real‑world scenarios?

How would you move all zeros to the end of an array using a two-pointer approach in one pass, achieving O(n) time and O(1) space?

Describe how you would automate the deployment of an ETL pipeline built with PySpark to AWS using GitHub Actions and AWS services. Include specifics on the tools and configurations you would use to ensure seamless deployment in testing and monitoring.

Explain why you should use 'IS NOT NULL' instead of 'ISNULL' in SQL queries.

What is a Level of Detail (LOD) expression and how do you use it in Tableau?

How do you reverse a list in Python?

What are common mistakes engineers make when using Python decorators?

How can you improve the performance of a system that uses Spring MVC?

How does JUnit work at a high level?

How would you optimize a system that depends on ports?

🎤 Want these answered in real-time during your interview?