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Most common system design interview questions for software engineers

Coding Now Expert • Jun 13, 2026 • 66 views

Top system design questions asked at product companies:

1. **Design a URL shortener** (Bit.ly)
2. **Design Twitter/Instagram** (social media feed)
3. **Design a rate limiter**
4. **Design WhatsApp** (messaging system)
5. **Design YouTube** (video streaming)
6. **Design a search autocomplete system**
7. **Design a distributed cache** (Redis)
8. **Design a notification system**
9. **Design an e-commerce cart**
10. **Design a leaderboard**

**Key concepts to study:** Load balancing, caching, CDN, database sharding, consistent hashing, CAP theorem.

Interview Full Stack Career