You dress business casual, pee in a cup, and they make it sound like they're doing you a favor by hiring you. They tell you in advance you're eligible for all kinds of bonuses you never get.

Disorganized, I took their tests all on the same day as well as the interview and was offered the job the same day. However I still had several interviews with other companies scheduled so I asked if I could have some time to consider their offer. I contacted them a week later to accept.