Pros
I get to use some very advanced tools. Amazon is a large company so there are in-house utilities for everything. An interesting part of working at AWS is that the services are built on top of other AWS services. There are very few use cases for third-party infrastructure. If you have a problem with one of the services, you can engage with engineers on that service's team directly instead of having to go through customer service or a product manager.
Cons
The work is quite fast-paced, and management often has a lot of control over what you work on. The worst part about working at Amazon is having to be on-call. All engineers on a team are on an on-call rotation, which can get you paged in the middle of the night or on weekends. Even if you have no idea how to solve a problem, you have to be the point of contact on customer tickets while you have to page another engineer to actually solve it. The job can also be quite stressful at times.