TCS Digital Interview Questions: Higher Package Track 2026

TCS technical interview FAQ

01What is the recruitment process at TCS?

The typical TCS recruitment process has 4 stages: TCS NQT Online Test: qualify at Digital threshold (top percentile) → Coding Round: 1–2 harder DSA problems (medium-hard, 60 min) → Technical Interview: advanced CS topics, system thinking, project deep-dive → HR Round: relocation, role discussion, compensation.

02What are the interview rounds at TCS?

TCS typically conducts 4 interview rounds: NQT (Digital threshold): Must score in top percentile: typically above 80th percentile in the Programming Logic section. Mock under timed conditions.; Coding Round (60 min): 1–2 medium-hard problems. Graphs, trees, and sliding window are common. Must submit working code: partial credit is limited.; Technical Interview (45–60 min): Advanced DSA + OOP at depth + basic cloud/system design questions. Expect 'what's the time complexity of your solution and can you do better?'; HR Round (15–20 min): Same script as Ninja: relocation, shift, joining, bond acknowledgement..

03What framework should I use for TCS technical interviews?

HireStepX recommends the Digital-grade DSA framework for this type of interview: Optimal solution from first principles → full time/space complexity proof → two alternative approaches and trade-offs → edge case enumeration → clean code with meaningful variable names.

04Reverse a linked list in O(1) extra space. Then explain when you'd use this in production.

To answer this question well, HireStepX recommends the Digital-grade DSA approach: Optimal solution from first principles → full time/space complexity proof → two alternative approaches and trade-offs → edge case enumeration → clean code with meaningful variable names. Ground your answer in a specific real example from your own experience.

05What is the difference between a class and an object? Give an example.

To answer this question well, HireStepX recommends the Digital-grade DSA approach: Optimal solution from first principles → full time/space complexity proof → two alternative approaches and trade-offs → edge case enumeration → clean code with meaningful variable names. Ground your answer in a specific real example from your own experience.

06Write a SQL query to find the second-highest salary in a department.

To answer this question well, HireStepX recommends the Digital-grade DSA approach: Optimal solution from first principles → full time/space complexity proof → two alternative approaches and trade-offs → edge case enumeration → clean code with meaningful variable names. Ground your answer in a specific real example from your own experience.

07What is normalisation in databases? When would you de-normalise?

To answer this question well, HireStepX recommends the Digital-grade DSA approach: Optimal solution from first principles → full time/space complexity proof → two alternative approaches and trade-offs → edge case enumeration → clean code with meaningful variable names. Ground your answer in a specific real example from your own experience.

08What's the difference between a stack and a queue? Give a real-world use case for each.

To answer this question well, HireStepX recommends the Digital-grade DSA approach: Optimal solution from first principles → full time/space complexity proof → two alternative approaches and trade-offs → edge case enumeration → clean code with meaningful variable names. Ground your answer in a specific real example from your own experience.