Unless you're a white man, it's nearly impossible to grow your career.
Atlassian talk a lot about diversity, but in reality there are remarkably few women or people from different ethnic backgrounds being promoted into leadership roles.
The company is run by a huge network of middle management (team leads) who are all trained to push their teams as hard as possible and get the most from them. This leads to a really competitive environment, long hours, constant pressure and a complete lack of work / life balance for devs.
You are expected to be online at all hours, especially if your team is based across different offices.