Company interview vault

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

#4351

What principles do you follow when designing RESTful APIs? — Cognizant interview

Reported in Cognizant interview loops. API design question covering resources, HTTP semantics, and versioning.

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Cognizant Mid-level (3–5 years) Behavioral

#4352

Tell me about a time you disagreed with a teammate. How did you handle it? — Cognizant interview

Reported in Cognizant interview loops. Behavioral STAR question assessing collaboration and conflict resolution.

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Cognizant Mid-level (3–5 years) System design

#4353

Design a distributed rate limiter for an API gateway — Cognizant interview

Reported in Cognizant interview loops. System design testing token bucket, sliding window, and Redis coordination.

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Cognizant Mid-level (3–5 years) System design

#4354

Design a URL shortening service — Cognizant interview

Reported in Cognizant interview loops. Foundational system design covering APIs, encoding, storage, and read-heavy scaling.

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

#4355

Explain and implement Dijkstra's algorithm for shortest paths — Cognizant interview

Reported in Cognizant interview loops. Graph algorithm for non-negative edge weights using priority queue.

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

#4356

Solve the 0/1 knapsack problem with dynamic programming — Cognizant interview

Reported in Cognizant interview loops. Classic DP testing tabulation, space optimization, and item selection reconstruction.

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

#4357

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

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

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

#4358

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

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

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

#4359

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

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

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

#4360

What is dependency injection and why is it useful? — Tech Mahindra interview

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

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

#4361

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

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

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Tech Mahindra Mid-level (3–5 years) Behavioral

#4362

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

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

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

#4363

Compare ACID and BASE consistency models in databases — Tech Mahindra interview

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

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

#4364

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

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

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

#4365

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

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

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