System Design Interview Crash Course
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Design a Distributed Rate Limiter

Here is the detailed, step-by-step design for a Distributed Rate Limiter.

1. Problem Definition and Scope

We are designing a distributed middleware system that limits the number of requests a user or client can send to an API within a specific time period. The goal is to prevent abuse, ensure fair usage, and protect backend services from being overwhelmed.

  • Main User Groups:

    • End Users/Clients: Mobile apps, websites, or 3rd party developers calling the API.

    • Internal Services: The API Gateway which enforces the decisions.

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