reliability 9
- Case Study: Designing a Real-Time Chat System
- Case Study: Designing a Distributed Rate Limiter
- Case Study: Designing a Notification System
- Observability (Knowing What Is Actually Happening)
- Rate Limiting (Fairness Under Abuse)
- Graceful Degradation (Designing Useful Failure Instead of Total Collapse)
- Circuit Breakers (Stopping Cascading Failure Before It Spreads)
- Timeouts, Retries, and Backpressure (Why Slow Failures Are More Dangerous Than Crashes)
- Single Point of Failure (How One Small Thing Can Bring Everything Down)