System Design Interview Crash Course
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Design an API Gateway

Here is the step-by-step system design for an API Gateway.

1. Problem Definition and Scope

We are designing a scalable API Gateway. This is a server that acts as the single entry point for all external traffic (mobile apps, web browsers, partners) entering our microservices architecture.

Instead of clients calling fifty different services directly, they call the Gateway, which routes the request to the right place.

Main User Groups:

  • External Clients: End-users or apps sending requests to access data.

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