I'm also fairly generalist although my title is cloud engineer, and have all the skills listed by the OP + IaC infrastructure deployment and cloud stuff, as does everyone on my team. I think that's the trick; everyone on my team is responsible for everything, so we're constantly taking tickets in whatever we're weakest at and consulting each other, which causes really fast skill growth. I can see how it would seem impossible in a more siloed environment though.

> I know my way around Elixir or React, as I do around C or Rust

Interestingly, I find that I've never been asked to write anything in a compiled language yet. I've been wondering how I could work those skills into my job, but it seems like it doesn't come up much in the things I end up working on