It was the closest experience to be part of a frat house with spoiled chauvinist guys. I personally experienced unbelievable situations that trigger all sort of alarms in the first few months such as managers openly cursing people on their back, making awful comments about employees and behaving like bullies.
There was a closed circle of friends that managed everything and rewarded or punished people based on their own feelings about people. Once I had a small issue with one of them, my career there was over, I was gone from any important project to the point that was almost harassment. They ignored me forever and I was not invited to any important meeting, decision or gathering.
The reason IT works in this company is they don't need to deliver anything or make money at all, the parent company pays for the huge expenses and lack of efficiency, a feature I was almost about to complete took 2 years more to be delivered.
Some practices were clearly very close to nepotism and favors to friends.
I never experienced something like that and I firmly believe I won't ever experience something worst.