That's an interesting idea. You'd probably need a psychologist to come up with the questionnaire and then maybe you could convince a company to let you run the study. You'd need paired feedback to0... I guess you could ask people to reveal their performance evals anonymously but that might undervalue employee-employer fit. You'd probably want to have these ranked by some outside metric of each company's success. Someone must've already done this, if not it'd be a good research project for a psychology or business school grad student. Sounds like a worthwhile YC startup. Maybe something like "work at a startup" could factor in or run this type of study too.