Discord's Voice and Chat Architecture

How Discord handles millions of concurrent voice and text users. Shows API Gateway, Elixir-based WebSocket Gateway for real-time text, Voice Gateway with WebRTC Selective Forwarding Units, Cassandra for message storage, Redis for presence tracking, Pub/Sub for message fanout, and guild-based shardin…

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About This Architecture

How Discord handles millions of concurrent voice and text users. Shows API Gateway, Elixir-based WebSocket Gateway for real-time text, Voice Gateway with WebRTC Selective Forwarding Units, Cassandra for message storage, Redis for presence tracking, Pub/Sub for message fanout, and guild-based sharding.

Discord's Voice and Chat Architecture

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Created by

February 9, 2026

Updated

February 13, 2026 at 5:47 PM

Type

architecture

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Discord's Voice and Chat Architecture — Architecture Diagram | Diagrams.so