The entire interview process seems to be designed to be mysterious. You're never quite sure who you're talking to, what their role/influence in the organization is, but you can be sure they are meticulously recording everything you say from their bank of interview questions. Expect it to feel very off-putting that no one seems capable of looking up from their laptops to make eye contact during face-to-face interviews. Expect very few interviewers to be considerate enough to allow you to ask your questions - time will end and it's on to the next automaton. At the end, they get together to drink Kool-Aid and debate all the data they've recorded about you to see if you're worthy enough. The other feedback on here relative to the fact that they operate more like a cult is accurate. They are looking for really sharp people, who have no problem being cagey, and furthering Amazon's "cult"ure.