more like introduction to getting a job at Jane Street
I interviewed at Jane Street years ago, back when I was quite active in the OCaml community, got to the on-site rounds but didn't get an offer (a lucky escape it turns out, tho' I was pretty disappointed at the time). Anyway - OCaml wasn't even mentioned during their process. I think they just assume they'll have to teach it anyway.
How so?
Well, I didn't even think to ask about this, but a friend of mine turned down their offer because they have no remote working. Like me, he didn't actually WFH that often but the lack of an option to do so occasionally was a deal-breaker for him, and it would have been massively inconvenient for me too. I ended up joining a very similar firm who were a bit more relaxed about it (who worked in C++ and Python mostly).