I was there for almost 3 years, you have the possibility to learn a lot about huge software systems and enterprise software development practices (both good and bad).
Your personal career and the way that can evolve only partially depend on you, it is 100% influenced by your manager and an MD level person. There are some unwritten rules in many groups which will not let you to get promoted despite the effort and results you put in.
good extra benefits
work life balance can be hard when you have to do releases in the weekend and it's not paid
This was the Budapest office from 2015 - 2017. Most of the office was on temp contracts and would be fired indiscriminately, the ED was a rampant mycologist who would regularly humiliate his subordinates. This work done was meaningless and unfulfilling.