I had an on campus interview that was very organized and welcoming. There were a group of HR managers from different Amazon Fulfillment Center sites that came to my campus and the group of interviewees were each paired to have two rounds of interviews with a different HR manager per interview. All the HR managers were dressed very casually and were all very friendly and kind. Most of the answers they were looking for were to be set up using the STAR interview method, and we heard back in about 3 business days after the interview if we would receive an offer or not.