I have a bookeeper for a home renovation company, a guy who does odd jobs here and there because he never knows where he'll end up (but his parents wanted him to be an accountant), and a fellow who works in the hard-count room of a casino.
I did work as a bookeeper, twice. Once for a food service company, once for a trucking company. Oddly enough, I spent most of my working life behind a bar, but I've yet to give that occupation to a character. Maybe I should. Lots of drama and goings-on in that field.