Avantages
Lots of options for developers - you can usually choose what you want to work on and how you want to work. Everything varies team-to-team, but it's universally positive. Path to promotion is very clear and encouraged. Problems are challenging, if not always unique/interesting. Environment supports and encourages quick learning.
Inconvénients
Everything is built around isolated teams. The company essentially functions as 1000 start ups moving in similar (but not the same) direction. This can result in duplicated work and wasted time. To some extent, this is unavoidable at such a large company, it's very common here to implement a full platform that will be dropped within the year. There's also quite a cult-of-personality around the higher ups.