| If you have… | Do this… | |----------------|--------------| | 2+ weeks | Read Vol 1 cover to cover, draw every diagram by hand | | 1 week | Chapters: URL shortener, chat system, rate limiter, proximity service (Vol 2) | | < 3 days | Memorize the SNAKE framework + trade-off tables (SQL vs NoSQL, consistency vs availability) | | Already strong DS | Skip to Vol 2, focus on Uber backend + distributed counters |

Each chapter follows a consistent 4–6 step approach:

Let’s be ethical. You will find 100s of links on Reddit (r/cscareerquestions, r/systemdesign) and GitHub. Here is the truth:

Since Alex Lu never officially published a "2026" book, these are the legal alternatives that serve the same purpose:

The original PDF focused heavily on REST and polling. Modern system design requires: