The great thing about Hive is you can pretty much use any language at this point.

Remember some of the biggest startups since the dotcom boom, especially those since ~2014, have been built with all kinds of crap initially, and then once funding has come in they are refactored.

Facebook is built with PHP (as is WordPress, 45% of the commercial web and over 62% of the inc 5000), Twitter and many others were built with Rails. Most AI is built with Python, as well as statistical modeling more popularized in R.

Front-end stuff is almost always JavaScript but since webassembly, it can't even be assumed that it was coded in JS ;)