Palantir Technologies Software Engineer (Government Division) interview questions

First was a technical phone interview followed by time for me to ask questions; I thought the interview was very enjoyable and I really got a positive feeling for the company from the interviewer. A few days later they called me back for on-site interviews, I went in about 2 weeks later. These interviews were a little less positive - interviewers seemed a little less upbeat, a little more cynical/closed off. After 3 interviews in the morning (technical, design, technical) they let me go after lunch. Apparently anyone who actually gets an offer has more interviews in the afternoon.