This is how I've approached joining the last two companies I've signed on with. In the hiring process I ask to speak with finance and the founders to see if the company has the legs to be a real rocket ship. Remember that an interview is just as much about them interviewing you as it is for you to interview them .
How likely is it that you as a potential employee get to see the books and know what's going on like that these days? Honest question; seems like it's a tougher thing to get access to than for a VC, but maybe I'm wrong.
Don't try the same with a small business. You will probably get kicked out.