Pros
Amazon continuously improve to be more customer obsessed each day. Data and metrics are reviewed on a regular basis to ensure we're focusing on the right things. Better yet, in Fulfillment Technologies, the impact of the work directly affects how packages get delivered to our retail customers. If you want to solve complex problems optimized for world wide scale then this is the place to work.
Cons
Amazon is not for everyone. If you don't want to be challenged, don't want to grow and learn, or afraid of owning software that's used 24/7 and requires high availability and resiliency, then this isn't the place you want to work at. There's no QA or production support to throw your work over the fence, so you eat your own dog food. The better you build your software the more enjoyable your work life will be.