Hi, I’m Sahn

I have decades of experience building large-scale distributed systems.

I wrote some best-selling books with Alex Xu on system design.

We make popular YouTube videos on system design with 500K subscribers.

We publish a popular weekly system design newsletter with 600K subscribers.

System Design Interview Book Series

I co-authored with Alex Xu the best-selling book “System Design Interview - An Insider’s Guide: Volume 2”.

It has 13 chapters covering wide-ranging and interesting system design topics. It is available in paperback and online.

System Design 101 GitHub repo

We launched a System Design 101 repo in Oct 2023, and it reached 18,000 stars in 4 days. It’s probably one of the fastest-growing repos in history.