Amazon

Lot of learning opportunities. Very intelligent co-workers. The scale of problems is so big; only a few companies have problems at such a large scale.

It's not a startup, and they keep saying frugality drives innovation, but we do not need to be frugal anymore. So, generally, we get away by adding a few hundred machines every time a scale issue comes up.

Management forces SDE-II/SDE-III to be influential, but that creates a bad work environment. Senior engineers have to force their decisions on junior engineers to meet their goals. This works well until you are SDE-I, but as you become more experienced, you would probably like to understand why trade-offs you are making in your design/development are worse than suggested by some other senior engineer.

Make goals that allow people to work together instead of forcing them to be rude.