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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 Web Crawler

A worked design for a search engine crawler, covering the URL frontier, politeness, duplicate detection and spreading the work across machines.

10 min readUpdated 2026-10-04system-designcase-studyweb-crawler