Company interview vault

Pinterest Mid-level (3–5 years) Behavioral

#2551

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

Reported in Pinterest USA engineering loops. Behavioral STAR question assessing collaboration and conflict resolution.

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

#2552

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

Reported in Pinterest USA engineering loops. System design testing token bucket, sliding window, and Redis coordination.

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

#2553

Design a URL shortening service — Pinterest interview

Reported in Pinterest USA engineering loops. Foundational system design covering APIs, encoding, storage, and read-heavy scaling.

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

#2554

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

Reported in Pinterest USA engineering loops. Graph algorithm for non-negative edge weights using priority queue.

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

#2555

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

Reported in Pinterest USA engineering loops. Classic DP testing tabulation, space optimization, and item selection reconstruction.

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

#2556

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

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

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

#2557

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

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

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

#2558

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

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

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

#2559

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

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

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

#2560

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

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

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

#2561

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

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

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Reddit Mid-level (3–5 years) Behavioral

#2562

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

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

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

#2563

Compare ACID and BASE consistency models in databases — Reddit interview

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

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

#2564

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

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

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

#2565

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

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

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