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Design a Distributed Rate Limiter is a hard system design interview question covering distributed systems, redis, algorithms — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
Design a rate limiter service that can be used across a distributed system. It should limit requests per user (e.g., 100 req/min) and work correctly across multiple application servers.
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