Pros
An opportunity to work with some of the brightest and most influential engineers in my field. The company has scale that is hard to fathom and decisions you make can impact millions of users and billions of servers. They are a growth oriented company and put pressure on me as a leader to develop my ICs and provide them career advancement.
Cons
Amazon is very proud of its peculiar culture and coming from the industry into AWS can be a bit unintuitive. Being older than most of the established norms, Amazon does things their own way and it takes a while to think the way your peers do. Until you do, it's very hard to make any headway or earn the trust of your peers to make proposals or get big projects moving. This is powerful but can cause insular thinking and has led to some teams acquiring massive amounts of tech debt rather than looking to places in the industry who have solved this problem.