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Designing a Rate Limiter

Building a distributed rate limiting system

1 min read | System Design
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Building a Distributed Rate Limiter

Designing a rate limiter that works across multiple servers is harder than a single-server rate limiter.

Architecture

Algorithm: Sliding Window with Redis

 limit → reject (429 Too Many Requests)
  5. Set TTL on key (auto-expire old windows)

  Redis commands:
  MULTI
  INCR rate_limit:user123:42
  EXPIRE rate_limit:user123:42 60
  EXEC

Edge Cases

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