Pros
1. Fast pace, great if you have a matching personality 2. Amazing opportunities to learn 2.1 highly experienced/competent/skilled engineers at the company put out knowledge sharing videos which are very insightful 2.2 the AWS library is free for employees 2.3 AWS certification exams are subsidized 3. Breadth of opportunities - given how many businesses Amazon is into, you can find a team that's into that business and transfer internally (so no need to change companies if you want to work in a different domain)
Cons
1. Easy to burn out if you have difficulty saying NO to more work 2. Forced attrition after performance reviews can be unfair 3. Pay for existing employees is below what the industry is paying 4. The distributed nature of development (which gives Amazon its edge) means multiple teams could be building the same thing, and you often have to race to get to production first so that your effort doesn't get disbanded (kinda like real life :))