Met the hiring manager at an my university career fair. My internship experience was very similar to what was required for the PM position in the manager's team. Scheduled a phone call where the manager explained what his team does, provided an example of a current problem the team is trying to solve and asked if I'd like to work on such projects. Shortly after, received an email for an on-site interview in their Seattle campus. The interview was relaxed, they were interviewing 8 candidates that day for 1 position. 4 interviews in total, 3 from members of the team including the hiring manager and 1 Amazonian who wasn't a part of the team so that I could get a different perspective on things. They are evaluating you against their 14 leadership principles, so know and understand them properly. Each interviewer's questions are directed over 2 of them, some will tell you the principles they are testing you on, some won't. Know your experiences and story well and you'll be good. Presented the offer 2 days after the interview.