1) They should act professional during the the interview. That means starting the interview on time, and being prepared, not just coming in, reading your resume

1) They should act professional during the the interview. That means starting the interview on time, and being prepared, not just coming in, reading your resume while you wait, and asking whatever questions they can come up with on the fly. It doesn't mean dressing a certain way. 2) They should ask you difficult technical questions, because you want to know that the people you will be working with were smart enough to pass a tough interview. 3) They should welcome difficult questions from you. I'm not necessarily taking about technical questions about their product, but more the way they run their shop. 4) They should not act like they are in a hurry, even if they are. 5) Ideally, they don't have a lot of unplanned turnover.