Terrible management, the French do not know how to manage or build a team of engineers and the in the US you need to brown nose the French hard to move up.
Had a manager take me into a room to berate me, loudly, with strong words, where everyone could see and hear us. This was after I was working overtime to complete a project while my colleagues sat around watching.
Sexism and racism both run rampant, especially on the business side and among those that graduated from the local university.
Compensation was low compared to local companies and the reason I finally left.