// Phase 4 · CS fundamentals & system design · course 10
System Design Fundamentals
How apps serve millions of users: load balancers, caches, databases at scale and queues, plus the framework for system design interviews.
Intermediate–Advanced⭐ Advanced · members7 lessons ready3 coming soon
You'll be able to
- Explain how a system scales from 1 to 1 million users
- Choose caches, queues and databases with clear trade-offs
- Design common systems end to end
- Lead a system design interview with confidence
Syllabus
Start course →- 1Scaling from 1 to 1 Million UsersHow a simple app grows into a system, one bottleneck at a time.🔒12 min
- 2Caching Strategies & Building an LRU CacheImplement the cache behind every fast system. A top interview question.🔒14 min
- 3Load BalancersSpread traffic across servers, and skip the ones that are down.🔒11 min
- 4Databases at Scale: Replication & ShardingCopy data for reliability, split it for size, and understand the trade-offs.🔒12 min
- 5Queues & Background JobsDo slow work later, retry failures safely, and keep your app fast.🔒12 min
- 6Case Study: Design a URL ShortenerWalk through a classic system design interview, then build its core logic.🔒15 min
- 7Acing System Design Interviews (+ Rate Limiter)A 45-minute framework, and the token-bucket rate limiter every big site uses.🔒15 min
- 8Case study: design a chat appComing soon
- 9Case study: design a news feedComing soon
- 10CDNs & object storageComing soon