System Design Interview Prep

Help me design [SYSTEM NAME] (e.g., URL shortener, Twitter, Netflix).

Requirements:
- Scale: [expected users/requests per day]
- Key features: [FEATURE LIST]
- Constraints: [latency, consistency, availability]

Design should cover:
1. Requirements clarification (functional + non-functional)
2. High-level architecture diagram (text-based)
3. Database schema design
4. API design
5. Scalability considerations
6. Caching strategy
7. Load balancing approach
8. Bottlenecks and solutions