Coders Crushby Napplied AI
MEDIUMInfrastructure

Design an API Gateway

Design an API gateway that handles authentication, rate limiting, routing, and request transformation for microservices.

Estimated Time: 45 minutes
#API Gateway#Rate Limiting#Authentication#Load Balancing

Solution Overview

API Gateways route requests, authenticate/authorize, rate-limit, and transform payloads. Request/response interceptors implement cross-cutting concerns. Circuit breakers protect backends. Caching reduces upstream load.

Architecture Pattern

Request router with middleware pipeline and backend pool management

Key Concepts

RoutingMiddleware PipelineCircuit BreakerRequest TransformationRate Limiting

Used By Companies

KongAWS API GatewayEnvoy

Learn Implementation Details

Explore a complete guide for building this system from scratch with step-by-step tutorials:

Solution Overview

API Gateways route requests, authenticate/authorize, rate-limit, and transform payloads. Request/response interceptors implement cross-cutting concerns. Circuit breakers protect backends. Caching reduces upstream load.

Hints to Get Started
1

Stateless vs stateful rate limiting

2

Service discovery integration

3

Circuit breaker pattern

Companies
  • •Kong
  • •AWS API Gateway
  • •Envoy
Key Concepts
  • •Routing
  • •Middleware Pipeline
  • •Circuit Breaker
  • •Request Transformation
  • •Rate Limiting
Implementation Url

https://github.com/codecrafters-io/build-your-own-x#build-your-own-command-line-tool

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