Company interview vault

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

#4201

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

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

Easy Read answer →

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

#4202

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

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

Medium Read answer →

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

#4203

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

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

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

#4204

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

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

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PhonePe Mid-level (3–5 years) Behavioral

#4205

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

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

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

#4206

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

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

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

#4207

Design a URL shortening service — PhonePe interview

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

Medium Read answer →

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

#4208

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

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

Hard Read answer →

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

#4209

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

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

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

#4210

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

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

Hard Read answer →

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

#4211

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

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

Medium Read answer →

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

#4212

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

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

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

#4213

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

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

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

#4214

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

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

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Paytm Mid-level (3–5 years) Behavioral

#4215

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

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

Medium Read answer →