Are you an NW5 or 6? Keep it high and tight. If you're like an NW3 you seriously have nothing to worry about. I frankly think job interviews, at least in the professional world, are the one situation where hair loss is almost beneficial. It is, frankly, a sign of maturity, if only in a pavlovian sense. Maybe you're only 23 or something, but having a receded hair line does give one an aura of authority, esteem, and experience. Especially if the interviewer is a middle aged man (or woman). If you're at the Abercrombie store, interviewing with a 24 year old little girl with half a brain made up for by a glorious figure, then maybe you might need to worry.