I was contacted by a recruiter that I had a previous relationship with. A couple of days later I was contacted and had a phone interview with the hiring manager. Two weeks later I interviewed in person. A day later I got an offer letter.

Multiple rounds / multiple persons. Behavior based questions and we were able to do it all over the phone. HR contacts were very helpful in describing the benefits and working environment. All interviewers were experts in their field / area. Major locations across the US included Schaumburg, IL and Oldsmar, FL.