← Theory library

System Design theory

CAP & PACELC theorems, Consistent Hashing, and resilient microservice architectures.

Practise in the Code Lab →

Easy

3. Load Balancing and Reverse ProxiesDistributing traffic across healthy application instances.

Medium

1. The CAP Theorem & PACELCTrade-offs in distributed data stores.
4. Caching and Cache InvalidationReducing latency and database load with deliberate cache policies.
5. Replication, Sharding, and Database ChoicesScaling data reads and writes without hiding consistency trade-offs.

Hard

2. Consistent HashingDistributed caching and node ring topologies.