I don't think they have any blog posts about it, but the CEO/architect doggedly pursued simplicity.

There was a single pub-sub messaging bus and a bunch of VMs in autoscaling groups. There were 2 databases optimized for different workloads. That's pretty much it.

> It's funny, do people not know about this stuff anymore? It's the low hanging fruit for scalability.

People tend to diagnose themselves with "special" diseases, whose treatments won't work for "common folk" :) I've done it myself plenty of times haha