Hi again,
This is hard to do without writing some code in the form. SharePoint does not have a row-based permissions model. Since the interviewers will come one after another, you can create separate form libraries. With code, you could require a password, but that's overkill and unruly. How do you plan to use the feedback?
Patrick Halstead [InfoPath MVP]
InfoPathDev
Patrick Halstead
Project Manager at Qdabra