Amazon

The scale of the problems Amazon needs to solve is often unique. If you like large-scale distributed systems, you'll love working at Amazon. There are really very few other places where you'll be able to have as much fun. Hours can sometimes be long, but they are well worth it.

Advancement is quick for the first couple of levels, but you can hit a proverbial wall once you get a more senior position.

I wouldn't ask that much be changed, other than what's already been noted. The company is doing very well, so I have no complaints.