> Entirely possible that the quantity of trading jobs available isn't nearly as high as something like MS though.

Yes, exactly. Other companies like Jane Street definitely exist in the finance space and pay really well but collectively hire far fewer engineers than FAANG + FAANG-like companies do. The thing I like about them though is that most of the time their comp is all cash (salary + bonus) so you don't have to wait around for anything to vest before you can move on, if you so desire.