Friendly, and simple. Lots of open ended questions to get me to talk and show off some experience. Be ready to not be given much direction but have to tie in how you're a good fit.

Interview process was straightforward. I applied online and received a phone call within a week followed by a phone interview with the hiring manager. I was flown to HQ for an in-person panel interview with small groups talking to me throughout the day followed by a presentation. I received an offer by phone within a few days of the in-person interview and accepted.