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).

A sufficiently large company uses basically every language at some layer.

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.

If you read the article they don't talk about "online" services / API which are probably most of them in Java.

I believe their is a fair bit of Kotlin used there too (based on some @netflix.com addresses in Kotlin libraries like Strikt)

Mainly a Java shop. They published Node and even some C stuff back then in their blog posts.

From what I understand from their talk on how they (don't) do devops they adopt a polygot architecture and teams use different languages.

We're everything!

JS is heavily used, as is Groovy, Java, Python, C and C ++, etc.

Depends on the project and the team. We're not about limiting people, but the choice should be justifiable (like... Brainfuck is probably not ok)

Java or JavaScript? Some of the replies to this post indicate JS, others Java, while they're not at all related to each other...