System Design Interview Crash Course
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Design Discord

Here is the step-by-step system design for Discord.

1. Problem Definition and Scope

We are designing a large-scale real-time communication platform organized into communities (Servers/Guilds) and channels. Unlike simple messenger apps, Discord focuses on persistent group chat for large communities (up to hundreds of thousands of users per server).

  • Main User Groups:
    • Regular Users: Join servers, chat in text channels, and see real-time presence (who is online).
    • Admins: Create servers, manage channels, and assign roles.

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