Company interview vault

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

#4336

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

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

Hard Read answer →

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

#4337

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

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

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

#4338

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

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

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

#4339

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

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

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

#4340

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

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

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Cognizant Mid-level (3–5 years) Behavioral

#4341

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

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

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

#4342

Compare ACID and BASE consistency models in databases — Cognizant interview

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

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

#4343

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

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

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

#4344

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

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

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

#4345

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

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

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

#4346

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

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

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

#4347

How does HashMap work internally in Java? — Cognizant interview

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

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

#4348

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

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

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

#4349

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

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

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

#4350

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

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

Medium Read answer →