My experience was a little unique as to the order and timing of the steps, but in the end I have been told that the overall process has been standardized world-wide for all SA roles.
The first step is to apply (if you can do so through a referral from a former co-worker, or if you've worked with an AWS recruiter before) If your resume makes it to the top of the stack, (for me this just took a couple days, your experience can/will vary) you'll receive an invitation to take an Online Assessment. You likely will not have even talked to a recruiter on the phone yet. It sounds intimidating, but it's not; there's three parts:
- The first is some basic Tech Questions. I'm not going to put any of these below, because they are super-basic IT questions; if you can't answer most/all of them, the job's not for you. No in-depth leetcode here (not on my test anyway); just things like the basics of IP networking, familiarity with storage concepts, etc.; enough to make sure that you aren't pretending to be in IT.
- The second is an online personality test. There are a lot of questions here, and a lot of them don't have "right" answers, but you can use the famous Leadership Principles to figure out what they are looking for. You'll frequently see questions where both answers look equally good/bad; use whatever sounds the most appealing to you.
- The third part is a "Work Simulation." You'll be presented with a series of e-mails between you and a customer; you pick an appropriate response. Some of these will have a technical component to them (the concepts will be just as basic as in the tech test earlier), others will be testing your customer service skills. (e.g. If a customer is having a problem, just curtly telling them that it's working as designed is probably not a great answer.) Again, the Leadership Principles are your guide here.
Assuming you pass (I have heard rumblings online that the online assessment is not really a huge weed-out step), then the next bit is a short phone chat with the recruiter. This was just a short half-hour call to discuss the position and get you scheduled for your 1st-round Interview.
The 1st-round interview is just an hour, and there's a *lot* to cover, so don't spend too much of it chit-chatting. Likely sorts of questions are the basic "Walk me through your resume" or "Tell me about yourself" (and for that one, they don't want to know your hobbies, or how many pet reptiles you have; they want your professional background and ambitions.) You'll probably get some variant of "Why Amazon." You will be asked basic tech questions; I believe these *should* be tailored to your resume. e.g. If you profess to be *really* good at networking, they are going to be more difficult than any questions asked about databases. The most important thing here is: don't guess without permission, and 'I don't know' is not a always-wrong answer. Being confidently-wrong is a great way to fail.
You will be asked Leadership Principles questions, though likely not more than two. These are the Amazon-Classic "Tell me about a time when you..." There's a ton websites purporting to have examples of these; most of them suck, and clearly aren't from actual interviews.
If you pass the 1st-round screening, you'll pass to the infamous "loop" (nobody could ever tell me what is being "looped"...) This was, for my L5 SA role, five one-hour interviews. Two L6 architects, the hiring manager, someone from sales (it's a pre-sales role; they need to be confident you can work in front of customers), and a "bar-raiser" (someone from outside the hiring org that is meant to be a voice of reason and sanity about you meeting their LP standards.) Get a good night sleep the night before, and expect to feel like a worn-out zombie at the end.
You'll be asked a bunch of LP questions, your peers will ask you tech questions (again, these are supposed to be tailored to your experience, though you should demonstrate some knowledge of IT concepts outside your specialty), and you will need to give a brief (20-minute) presentation to the hiring manager. Expect follow-up questions, in-depth, for everything. Re-use stories between interviewers sparingly (this apparently trips up a lot of candidates.) Don't B.S.; they'll know.
My most valuable prep source was the terribly-named YouTube channel www.youtube.com/@amazoninterviewwhizzdayone503 Despite the funny name, they are the real deal when it comes to prep. (I am not affiliated with them.) I watched a ton of their videos, and participated in some of their weekly free chat sessions. (I also paid for their prep package, but even their free stuff on YouTube is very, very, good.)