If you aren't management's favorite, you'll constantly get passed up for every opportunity and will be largely ignored. Mgmt has no direction or strategy whatsoever.
You'll likely work on crap codebases with minimal attention to good code practices. Expect to gain little to no marketable skills if you aren't lucky.
You're nothing but a billable resource. Developers are disposable.
You will be severely underpaid, and won't receive any significant monetary compensation for your extra work. I literally make 5x what I used to at Zirous.