System Design Atlas

A visual-first reading app for system design and coding interviews. Concept modules build from the ground up, technology pages cover the systems designs name, and worked designs open with the hard part and have diagrams you can click. Outage case studies turn real postmortems into lessons, and a coding track lets you step through each algorithm as the code runs. Most of it is free. Premium adds an interview script for every design and courses on Frontend System Design and AI Engineering.