The first contact will typically come from the recruiter, who may or may not do an official phone interview with you first to try and get to know you. Depending on how that goes she may schedule an interview to meet with one of the Unit Managers which are picked at random. When I got hired (2009) I was interviewed by three people at the same time but most recently I've seen 1-on-1 interviews of new hires. The interview can be pretty intimidating but just be friendly and professional and it should go pretty smoothly.