No walls of text. Every concept comes with live diagrams, step-through workflows, simulators you can break, and quizzes to lock it in — from “what happens when I type a URL” through consensus, stream processing and multi-region failover, all the way to designing payments, video streaming and LLM platforms at scale.
This is roughly what a large web system looks like. By the end of the course you'll understand every box and every arrow. Click any component to jump to the chapter that explains it.
Each chapter follows the same rhythm, designed to build intuition first and vocabulary second.
Every idea starts with a real-world analogy before any jargon appears.
Animated diagrams you advance one step at a time — see exactly what happens where.
Simulators let you kill servers, spike traffic and flood caches to see how systems react.
Check your understanding and learn how each topic shows up in interviews.
Reading is the easy part. These are for making it stick — and for the week before an interview.
All 210 quiz questions as a self-scheduling deck. Cards you miss come back sooner; cards you know disappear for weeks.
Draw one of 32 problems, run the 45-minute timer with phase prompts, then score yourself against a rubric.
174 terms in one line each, linked to the chapter that explains them properly.
Go in order — later chapters build on earlier ones. Your progress is saved in this browser.