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Notes on system design, distributed systems, backend engineering and GenAI — mostly lessons from things I've built.

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4 min read

Atomic rate limiting across gateway instances with Redis Lua

Why a read-then-write rate limiter breaks as soon as you run two gateways, and how SENTINEL makes the token bucket check atomic with a single Redis Lua script.

  • #system-design
  • #redis
  • #rate-limiting