Slack's Real-Time Messaging Infrastructure

GENERALArchitecture
Slack's Real-Time Messaging Infrastructure — GENERAL architecture diagram

About This Architecture

How Slack delivers messages in real-time to millions of users. Shows WebSocket Gateway for persistent connections, Channel Service for message routing, MySQL with Vitess sharding for message storage, Flannel for client-side caching, Kafka for event streaming, and Elasticsearch for search.

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How Slack delivers messages in real-time to millions of users. Shows WebSocket Gateway for persistent connections, Channel Service for message routing, MySQL with Vitess sharding for message storage, Flannel for client-side caching, Kafka for event streaming, and Elasticsearch for search.

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About This Architecture

How Slack delivers messages in real-time to millions of users. Shows WebSocket Gateway for persistent connections, Channel Service for message routing, MySQL with Vitess sharding for message storage, Flannel for client-side caching, Kafka for event streaming, and Elasticsearch for search.

Slack's Real-Time Messaging Infrastructure

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Created by

February 9, 2026

Updated

May 20, 2026 at 8:42 AM

Type

architecture

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