Courses
Structured, visual deep-dives. Each course marks which of its lessons are free to read.
How large systems really work
System Design
The flagship track: from object-oriented foundations and design patterns to the architecture of planet-scale services, taught visually. Opens with the low-level design modules every interview loop grades.
5 lessons · 3 free
API Design
Design APIs like a senior engineer: REST vs GraphQL vs RPC, versioning, security and a delivery framework, applied to Twitter, Uber, Reddit and Ticketmaster.
14 lessons · 0 free