what does the infrastructure of HN look like? 1 tall SQL server and an API written in... Python? Ruby? Rails? How many instances? Cloud? How tall of a server/servers?

It is as interesting to me as those "here is how we run StackOverflow" articles

No newfangled complicated k8s I'm guessing :P

HN is written in Arc, a Lisp that pg created. Hardware hasn't changed much since https://news.ycombinator.com/item?id=16076041. I believe traffic is closer to 6M now.

What if it was a cake :)