Pros
Amazon, and especially AWS, is a training ground for smart, execution-oriented, hard-working tech professionals. The company emphasizes delivering constant results, thinking big, and a hierarchical culture, so it may not be for everyone. But for those who are driven, you will grow immensely. One especially salient and unique pro of working at Amazon is the ability to grow your career into different directions that you could never imagine. At most tech companies, you're hired to do your job well. At Amazon, succeeding in one role or team means most other teams will take a chance on you. This is particularly valuable in the early and mid-stages of your career.
Cons
Classic things about big tech. -things can move slowly (lots of process and approvals required when you're operating at this scale) -very hierarchical culture -certain managers or teams can be toxic (avoid them) -following the Amazon playbook can sometimes become cultish and discourage independent thinking, especially with managers/teams that aren't the highest quality -pay used to be slightly lower than other big tech, but I believe this has changed in the past couple years