Company interview vault

Infosys Mid-level (3–5 years) Coding / DSA

#4441

Design and implement an LRU cache with O(1) get and put — Infosys interview

Reported in Infosys interview loops. Hash map plus doubly linked list problem bridging DSA and system components.

Hard Read answer →

Infosys Mid-level (3–5 years) Coding / DSA

#4442

How many distinct ways can you climb n stairs taking 1 or 2 steps at a time? — Infosys interview

Reported in Infosys interview loops. Introductory dynamic programming problem isomorphic to Fibonacci.

Medium Read answer →

TCS Mid-level (3–5 years) Coding / DSA

#4443

How do you perform topological sort on a directed acyclic graph? — TCS interview

Reported in TCS interview loops. Graph algorithm for task scheduling, build systems, and course prerequisites.

Medium Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4444

What is dependency injection and why is it useful? — TCS interview

Reported in TCS interview loops. Java/Spring staple connecting OOP design to testable service architecture.

Medium Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4445

How do you version a public API without breaking clients? — TCS interview

Reported in TCS interview loops. API evolution question covering compatibility, deprecation, and communication.

Medium Read answer →

TCS Mid-level (3–5 years) Behavioral

#4446

Tell me about a project that failed or missed its deadline. What did you learn? — TCS interview

Reported in TCS interview loops. Behavioral question testing accountability, retrospectives, and growth.

Medium Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4447

Compare ACID and BASE consistency models in databases — TCS interview

Reported in TCS interview loops. Distributed data question bridging SQL transactions and NoSQL eventual consistency.

Medium Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4448

How does Node.js handle concurrent requests with a single thread? — TCS interview

Reported in TCS interview loops. Node.js architecture question on libuv, event loop phases, and worker threads.

Medium Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4449

When would you use useState versus useReducer in React? — TCS interview

Reported in TCS interview loops. React hooks question on local state complexity and predictable updates.

Medium Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4450

What is the Python GIL and how does it affect concurrency? — TCS interview

Reported in TCS interview loops. Python-specific question on threading limits and multiprocessing alternatives.

Medium Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4451

Explain the JavaScript event loop, call stack, and task queues — TCS interview

Reported in TCS interview loops. Core JavaScript concurrency model question for frontend and Node.js roles.

Medium Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4452

How does HashMap work internally in Java? — TCS interview

Reported in TCS interview loops. Java-specific collections question on buckets, hashing, and resize behavior.

Medium Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4453

What is the difference between unit and integration tests? — TCS interview

Reported in TCS interview loops. Testing strategy question covering pyramid, mocks, and confidence vs speed.

Easy Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4454

Explain CI/CD and what a typical pipeline includes — TCS interview

Reported in TCS interview loops. DevOps fundamentals for mid-level engineers discussing automation and quality gates.

Medium Read answer →

TCS Mid-level (3–5 years) Technical deep dive

#4455

When would you choose microservices over a monolith? — TCS interview

Reported in TCS interview loops. Architecture trade-off question for mid-level backend and platform roles.

Medium Read answer →