There was about a 20 minute phone interview screen and once i got passed that, they flew me to the location where there was about an hour interview with the manager and program manager. The questions were the basic intro questions (why do you want to work here, what do you like about this position, etc) behavioral ( How have you been innovative, describe a misunderstanding, etc) and then there was the technical section. I would say just know the V model really well.