Rust on the server side, because I'm really into Rust now. There are a lot of great things about Rust — safety, expressiveness, versatility, etc. — that others can explain better than me, but I started learning it in 2020, because I initially wanted to use WebAssembly, so Rust was a natural choice. I ended up not doing too much with Web Assembly, but by 2021 I was having a lot of fun with Rust. I loved programming in it.
To build this current iteration of the site, I compared as many web frameworks as I could find, and ultimately chose Actix. Apart from its middleware which is a little beyond my current understanding, Actix's API is discoverable and easy to learn. The best place to look for help has been their examples repo. They also have a Discord.
Some of the more important Cargo dependencies that I'm using, besides Actix:
Any how there is more I could write about this rewrite, and I will certainly be writing more about Rust in the future.