I met a recruiter at my University (engineer supervisor) and we had a 30 minute interview the next day. I was asked very technical questions mostly about semi-conductor physics. Several weeks later I was asked to come to their campus in Boise for a full day of interviews. I went through about six 40 minute interviews from various people in the department. Test questions ranged from debugging code to circuit analysis to transistor physics. I was given an offer at the very end of the day.

Full day on-site with lots of interviews. Some interviews had more than one person. Most questions were straightforward. Only a minimum of dumb questions like "what is your biggest weakness". Nice people