System Design
Turn an open-ended prompt into a system you can defend: scope it, size it, draw it, and argue the trade-offs.
30 free · 14 with Plus
Getting Started
Fundamentals
Building Blocks
Case Studies
- URL Shortener20 minHard
- Rate Limiter18 minHard
- Key-Value Store21 minHard
- Unique Distributed ID Generator18 minHard
- Web Crawler20 minHard
- Gaming Leaderboard17 minMedium
- Metrics Monitoring18 minMedium
- Twitter20 minHard
- WhatsApp22 minHard
- Notification System19 minHard
- Dropbox20 minHard
- Ticketmaster18 minHard
- Uber19 minHard
- Google Docs19 minHard
- Ad Click Aggregation18 minHard
- Search Autocomplete (Typeahead)16 minMedium
- Stripe19 minHard
- Instagram19 minHard
- YouTube20 minHard
- LLM Inference Service19 minHard
- AI Agent Platform19 minHard