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Design an API gateway handling 100K requests/sec across 500+ backend services with <5ms p99 latency overhead, supporting routing, auth, rate limiting, and request transformation.
## Problem
Design an API gateway that serves as the single entry point for a platform with 500+ backend microservices. The gateway must handle request routing, authentication, rate limiting, request/response transformation, and API versioning — all while adding less than 5ms of latency overhead at p99. Think of building the core infrastructure behind Kong, AWS API Gateway, or Apigee.
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