Core building blocks, real-world case studies and interview-ready frameworks — essential for senior roles and FAANG interviews.
Understanding how clients communicate with servers
Core networking protocols every engineer should know
Comparing API design approaches
How domain resolution and content delivery work
When to use relational vs non-relational databases
Horizontal partitioning of data across databases
Data redundancy and distribution strategies
Improving performance with in-memory caching
Scale out vs scale up strategies
Breaking monoliths into distributed services
Asynchronous communication between services
Building reactive, decoupled systems
Protecting systems from abuse and overload
Social media feed, followers, trending topics
Photo sharing, stories, explore feed
Real-time messaging, presence, encryption
Video streaming, recommendations, search
| Problem | Difficulty |
|---|---|
| Design LeetCode | Medium |
| Design URL Shortener | Easy |
| Design Webhook | Medium |
| Design Google Docs | Hard |
| Design Spotify Top K Songs | Medium |
| Design Yelp | Medium |
| Design Rate Limiter | Easy |
| Design Pastebin | Easy |
| Design Realtime Monitoring System | Medium |
| Design Typeahead System | Medium |
| Design a Comment System | Medium |
| Design Twitter | Hard |
| Design WhatsApp | Hard |
| Design Dropbox | Hard |
| Design YouTube | Hard |
| Design Uber | Hard |
| Design Google Maps | Hard |
| Design TicketMaster | Hard |
| Design Netflix | Hard |
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