Don't take for granted you'll be working on what you where told or interviewed for: there have been multiple cases in which they were simply clueless on our domain or even making things up to hook us (it doesn't make sense but often they only worry about reaching a quota).
Once in the company you'll find yourself surrounded by so-called business people, 99.9% from Germany, completely outdated and unwilling to update in terms of technology, but still making technical decisions without consulting and then telling you (not asking) to execute, regardless the nature of the work and your field of expertise.
You won't have a career plan unless you intend to move to management. This is something which global HR has already expressed crystal clear.
If you're Spanish, be sure you'll be commented rancid theories about how warmer environments render less effective workers, or even asked if you do "siesta"... and of course that's not the only minority which I've seen consistently diminished. Also "newest" specialties like Data Scientists or Scrum Masters suffer this kind of treatment.
In the meantime you'll be able to see how upper management and social media comment how proud they are of their multiculturality.
Also you'll be encouraged to help change things for the better, so you'll start putting all efforts possible (in addition to your, sometimes nonsense, work) to do so. In 2 years I've seen and/or pushed for probably around 10 initiatives in this regard, most of which failed once they reached the point in which a change from upper management is required (which is almost always, because clearly simple developers are not presumed to have any power to change things)...
At some point you'll reach to the conclusion that it is what it is, and if the company gets lucky you'll have lost enough expertise putting your efforts in everything but in your initial domain, and decide to keep in the company because at least you have a competitive salary and good benefits. You'll be becoming either a lifelong developer who executes whatever nonsense work is told or one more outdated business man (who will probably be asked to move to Germany if so).
