Company interview vault

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

#2446

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

Reported in Coinbase USA engineering loops. Hash map plus doubly linked list problem bridging DSA and system components.

Hard Read answer →

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

#2447

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

Reported in Coinbase USA engineering loops. Introductory dynamic programming problem isomorphic to Fibonacci.

Medium Read answer →

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

#2448

Explain the CAP theorem and what it means for distributed systems — Zoom interview

Reported in Zoom USA engineering loops. Classic system design question asked at US big-tech and fintech on-site loops.

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

#2449

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

Reported in Zoom USA engineering loops. Graph algorithm for task scheduling, build systems, and course prerequisites.

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

#2450

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

Reported in Zoom USA engineering loops. Java/Spring staple connecting OOP design to testable service architecture.

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

#2451

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

Reported in Zoom USA engineering loops. API evolution question covering compatibility, deprecation, and communication.

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Zoom Mid-level (3–5 years) Behavioral

#2452

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

Reported in Zoom USA engineering loops. Behavioral question testing accountability, retrospectives, and growth.

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

#2453

Compare ACID and BASE consistency models in databases — Zoom interview

Reported in Zoom USA engineering loops. Distributed data question bridging SQL transactions and NoSQL eventual consistency.

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

#2454

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

Reported in Zoom USA engineering loops. Node.js architecture question on libuv, event loop phases, and worker threads.

Medium Read answer →

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

#2455

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

Reported in Zoom USA engineering loops. React hooks question on local state complexity and predictable updates.

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

#2456

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

Reported in Zoom USA engineering loops. Python-specific question on threading limits and multiprocessing alternatives.

Medium Read answer →

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

#2457

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

Reported in Zoom USA engineering loops. Core JavaScript concurrency model question for frontend and Node.js roles.

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

#2458

How does HashMap work internally in Java? — Zoom interview

Reported in Zoom USA engineering loops. Java-specific collections question on buckets, hashing, and resize behavior.

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

#2459

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

Reported in Zoom USA engineering loops. Testing strategy question covering pyramid, mocks, and confidence vs speed.

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

#2460

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

Reported in Zoom USA engineering loops. DevOps fundamentals for mid-level engineers discussing automation and quality gates.

Medium Read answer →