Company interview vault

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

#4156

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

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

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

#4157

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

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

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

#4158

How does HashMap work internally in Java? — Ola interview

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

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

#4159

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

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

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

#4160

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

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

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

#4161

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

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

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

#4162

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

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

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Ola Mid-level (3–5 years) Behavioral

#4163

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

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

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

#4164

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

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

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

#4165

Design a URL shortening service — Ola interview

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

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

#4166

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

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

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

#4167

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

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

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

#4168

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

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

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

#4169

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

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

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

#4170

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

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

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