System Design · sector

Fundamentals

The building blocks every system is made of, from the basics to the advanced.

1 ready to open · 18 more on the way

How a request travels→

What happens when you open an app

DNS, TCP, HTTPS, CDNs and servers: one request followed from your phone to a data center and back.

Beginner3 chapters · ~5 min

Coming next · 18 in the works

Databases & indexes
Caching
Load balancers
Queues
Scaling
Sharding
Retries & idempotency
Failover & backups
Blast radius
Observability
The interview
Consistency & consensus
Transactions
Event logs & streams
Search
Real-time collaboration
Global systems
Serving AI