AI Coding Challenges

Real coding problems from AI company interviews - rate limiters, retrieval pipelines, retry handlers - with full implementations, key design decisions, and follow-up Q&A.

Each challenge is scoped for a 45-minute coding interview

Mid-Senior

Rate Limiter

Design a thread-safe sliding-window rate limiter with per-user and global call limits using timestamp lists and a threading lock.

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Mid-Senior

RAG Pipeline

Implement a retrieval-augmented generation pipeline: ingest documents, chunk with overlap, embed, and retrieve top-K similar chunks via dot-product similarity.

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Mid-Senior

Retry Handler

Implement a configurable retry handler with exponential backoff, jitter, and a max-delay cap to prevent thundering herds and unbounded blocking.

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