System Design Builder
Drag, connect, and validate architecture.
Pick a challenge, design on the canvas, and run the smart validator — hard requirements plus a soft quality score. Practice anytime, or take a timed challenge from your examiner.
Real-Time Chat System
mediumDesign a WhatsApp-like messaging platform.
Start practice →
URL Shortener
easyTiny links with fast redirects at scale.
Start practice →
News Feed
mediumSocial timeline with fan-out and caching.
Start practice →
File Storage Service
mediumUpload, store, and serve files securely.
Start practice →
Ride Matching
hardMatch riders to drivers in realtime.
Start practice →
API Rate Limiter
easyProtect APIs with fair request quotas.
Start practice →
Search System
mediumIndex documents and serve fast relevance queries.
Start practice →
Push Notification Service
easyReliable fan-out of push/email/SMS alerts.
Start practice →