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Building Blocks5

Distributed Patterns4

Design a URL Shortener
Design a Rate Limiter
Design a News Feed
Design a Chat System
Design a Distributed Key-Value Store
Design a Notification System
Design a Search Autocomplete
Design a Web Crawler
Design a Video Streaming Platform
Design a File Storage and Sync Service
Design a Ride-Sharing Service
Design a Ticket Booking System

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Building Blocks5

Distributed Patterns4

Design a URL Shortener
Design a Rate Limiter
Design a News Feed
Design a Chat System
Design a Distributed Key-Value Store
Design a Notification System
Design a Search Autocomplete
Design a Web Crawler
Design a Video Streaming Platform
Design a File Storage and Sync Service
Design a Ride-Sharing Service
Design a Ticket Booking System

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Design a Chat System

A complete worked design for something like WhatsApp — connection management at scale, message ordering, delivery guarantees and group chat fan-out.

13 min readUpdated 2026-09-03system-designcase-studywebsocketschat