15real ML & LLM system design problems — each with a structured editor, FAANG interview framework, architecture component snippets, 45-minute timer, and AI review of your answer.
Write your design
Markdown editor with template
Check key areas
Interactive must-cover checklist
Use framework
5-step FAANG interview guide
Get AI review
Scores 5 sections with feedback
Design YouTube Video Recommendation
Design Real-Time Fraud Detection
Design Search Ranking System
Design Ads CTR Prediction Pipeline
Design Real-Time ML Feature Pipeline
Design Google Search Personalization
Design Uber ETA Prediction
Design Content Moderation at Scale
Design Spotify Song Discovery Engine
Design Instagram Feed Ranking
These problems are also linked directly from the Interview Prep Sheet — expand any System Design item to open its workspace.