Google-inspired practice
5 independently authored System Design scenariosconnected to public Google engineering references.
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Google Doc
Design Google Docs’ real-time collaborative editing — multiple users typing in the same document simultaneously and seei...
Google Drive
Design Google Drive as a permissioned file platform — folder hierarchies, shared drives, and access control that scale a...
Recommendation System
Design a large-scale personalized recommendation system for feed/video/ads.
Web Crawler
Design a web-scale crawler that politely fetches and indexes billions of pages, deduplicates content, and keeps the corp...
Online Judge
Design a LeetCode-style online judge that safely runs untrusted user code at scale.