- Career growth is close to non-existing - with "DSO" changes, most of the middle managers were laid off, so it's almost impossible to get a promotion. Also, there's no clear career path - everyone will tell you "yeah, you need to be proactive, participate in different initiatives yadda yadda yadda", but it would not guarantee anything.
- Not an IT company: the engineering culture is OKish, but depends on the team you'll join. Plus, don't expect extremely interesting/challenging tasks.
- Prepare to be torn between US and Warsaw offices. You'll have different managers (with their own interests) and team-members from both locations, which results in blurred vision of your own priorities.