Unfortunately, the company had to grow too fast and did not do it properly. People who achieved managerial status did it by being friends with current managers and now collect lots of complaints by managed employees.
Even though the company has a big profit in the US mostly due to the use of Brazilian manpower salary, they won't admit profit so they don't need to pay the union mandatory Profit share to employees. Legal? Yes. Moral? Not really.
If you get selected on their Olympian program to move to the US, they don't care about your personal life. The salary is default no matter you are junior or senior. They will not support anything for your family to relocate with you. Relocation package lacks some standard benefits other US companies offer. So you got to check if it's good enough, but they will only tell you that once the visa is approved and you are about to mode to the US in the next couple weeks.
Noisy environment. Since it's an open minded environment, it has it's price, people can be really noisy, and since you have meetings on the phone all day long, it can be a nightmare sometimes. There's not enough private rooms for meetings.
If you don't play on the exact rules the company management outlines (focusing on growing and money instead of people development) you will not *shine* on their horizon and will stay on the same position (or get demoted depending) no matter how good job you do and how good you impact your co-workers life. Once I heard from a manager "We don't need to improve. Let this people leave the company, they will come back crawling in 2 months". Hint: they didn't.