The interview was informal and conversational -- not a skills assessment. The tone was pleasant. There were two interviewers. One was the supervisor or second-level supervisor for the position, and the other was a supervisor software engineer, but not in the same chain of command.
At the time I had the interview, they had not stooped to "Behavioral Based Interviews", and that was very nice. I've never been particularly adept at lying, so I really suck at BBI.
What made the interview negative for me was that during the course of the interview, I came to realize that Northrup wasn't interested in innovative thinkers that make things happen. No, they just wanted someone who would mindlessly follow the DOD's software maturity model and generate mountains of paperwork -- all of which they could charge a fortune for.
As they asked me about past accomplishments, the only thing the second interviewer could focus on was "Who tasked you?", and "What was the formal process for tasking you?", and other questions that were obviously straight from the Software Maturity Model nonsense. That interviewer left disgusted with my answers, and I left realizing that even if they offered me the job, I couldn't have taken it.