medium★ EssentialOpenAIAnthropicGlean

Build a rate limiter: fixed window, then sliding window, then per-customer tiers

A verbatim-reported multi-part at OpenAI and Anthropic. Each level breaks the previous design on purpose: the burst-at-the-boundary flaw is planted, and naming it before the interviewer does is how you win the round.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

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Next in this trackYou're given a small repo with failing tests and a vague bug report: fix the bugs, then add a featurePremium Next in this trackWrite a document chunker for embeddings: max token budget, sentence boundaries, configurable overlap, with testsPremium Next in this trackBuild a client for a flaky API: retries with exponential backoff and jitter, timeouts, and idempotencyPremium

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