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System Design for AI in Production / 75
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Design a distributed rate limiter for an API serving millions of requests per second.

Every API platform needs one. Interviewers reward the candidate who picks the right algorithm (token bucket vs sliding window) for the burst behavior, then solves the genuinely hard part: enforcing one shared limit across many servers without a per-request round trip to a central store.

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

Every API platform needs one. Interviewers reward the candidate who picks the right algorithm (token bucket vs sliding window) for the burst behavior, then solves the genuinely hard part: enforcing one shared limit across many servers without a per-request round trip to a central store.

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