FREE SYSTEM DESIGN

Learn system design by building it.

46 hands-on lessons that take you from your first web request to answering a real system design interview question, by building the system, not memorizing it. You drag real components, load balancers, servers, caches, databases and queues, onto a canvas, connect them, and run a live traffic simulation to see exactly where your design breaks and how to fix it. Free to use, with no login needed for the first lessons.

The curriculum

Foundations

• Anatomy of a Web Request
• HTTP
• APIs & JSON
• Latency vs Throughput
• Stateless Servers
• Sync vs Async

Scaling

• Load Balancer
• Horizontal vs Vertical Scaling
• Load Balancing Algorithms
• Health Checks
• Auto-scaling
• Session Management
• CDN
• Edge Computing

Caching

• Why Caches Exist
• Cache
• Write-Through vs Write-Back
• Cache Invalidation
• Multi-Tier Caching

Data

• SQL vs NoSQL
• Database Indexes
• Database Replication
• Sharding
• Consistent Hashing
• ACID Transactions
• Eventual Consistency

Async

• Message Queue
• Pub/Sub
• Event-Driven Architecture
• WebSockets
• Webhooks
• Rate Limiting

Reliability

• Single Point of Failure
• Failover
• Circuit Breaker
• Retries & Backoff
• Idempotency
• Disaster Recovery

Operate

• Logging
• Metrics & Alerting
• Containers
• CI/CD

The Interview

• How to Crack a System Design Interview
• Design a URL Shortener
• Design a News Feed
• Design YouTube

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