The last person I talked to was looking for a new job. He loved what he was working on and felt proud of his work but was also feeling extremely burned out and wanted to stop working every weekend and evening. He also told me they use _literally every_ technical stack. He had worked on a Ruby app, a Python app, a .Net app, a .Net Core app, and many of them are supposed to work together they were just written that way because whoever started it was more familiar with a specific language.
It doesn't sound like a great place to work for to me. I talked to someone at SpaceX who told me similar things but it sounded like their usage of random tech stacks was at least lower than Tesla's.