# System Design Problems

- [Designing an API Rate Limiter](/system-design/system-design-problems/designing-an-api-rate-limiter.md)
- [Design News Feed](/system-design/system-design-problems/news-feed.md)
- [Design Recommendation System](/system-design/system-design-problems/recommendation-system.md)
- [Design Photo Sharing App](/system-design/system-design-problems/design-photo-sharing-app.md)
- [Design Location Based App](/system-design/system-design-problems/design-location-based-app.md)
- [Design Messenger App](/system-design/system-design-problems/design-messenger-app.md)
- [Design Twitter](/system-design/system-design-problems/design-twitter.md)
- [Design Uber Lyft](/system-design/system-design-problems/design-uber-lyft.md)
- [Design Surge Pricing](/system-design/system-design-problems/surge-pricing.md)