I mainly write js but our team maintains a scala app as well. It is much more of a polyglot company with a history of java (I have only been here 1.5y so this is from hearsay and my expirence, not a definitive source).
When I interviewed there a couple years ago (decided to stay in phx), it was a polyglot culture... the team I was interviewing with was largely node/js. I'm not surprised to see a lot of Python, Java or anything else that leverages existing tooling. For that matter, I wouldn't be surprised by custom C++, Go or Rust for some pieces.