AWS Cloud Support Engineer
Here's my personal experience:
Very nice people but very long interviewing process (~5 itws, about a month) and few days preparation demanding. Do it if you really want it, if salary is incredible and you're ready to put the time for (personally I even put on hold doing new applications lol, but I'm in a special situation where I wasn't really interested in anything else), and ready to drink the Amazon kool-aid and think like Jeff Bezos (with a desk made from a refurbished door-frugality LP lol-check 1999 itw).
First itw with recruiter, know more about you, your experiences, and what you expect in salary.
Recruiter is very friendly and want to help you get through all the process.
Second itw is technical (but you expected to answer with STAR method the behavorial questions, however if the person you're getting an itw with is not manager/etc and just engineer, you're likely to only have technical questions that don't need STAR) and have a good background in networking and OS, and globally how to troubleshoot common problems, you can find some examples in CC.
If OK you then proceed to Amazon Loop which is 4/5 itws with 4/6 people involved in the activities you're applying to. Some itw can only be technical. For others, learn Amazon LPs, and find examples (you can find docs with sample questions : Amazon Consolidated AIQB) to answer LP questions (2 examples for each LP can be good). Each itwer will have an LP to ask questions for, so make sure that you can explain deeper your examples and not forget the LPs in mind. Well, LP, LP and Amazon LP kool-aid you're expected to been born with.
For me, my interviewers were really nice and make sure you're confortable while professional and doing their interviewing work. I think being genuinely honest (and a genuine honest doesn't say "honestly" every 5 seconds btw) was also a key, there were quite a good bunch of questions where I answered sorry I don't know.
Salary offer is probably based on your performance on Loop.
Conclusion : very long itw but with nice people, do it when you really want it and ready to put the time for (without any guarantee of getting an offer).
However, it's quite sad that recruitment processes so long and energy demanding are now generalized in large businesses. I don't think that allows to have the best candidates, because the best candidates doesn't need to spend so much time to not even have a guarantee to have something at end.