Can a full-time Ph.D. student legally work in a private company, and draw the stipend from the university and the salary from the job at the same time?
I am interested to know the regulations of Germany and Poland.
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No. In many German contracts, it is explicitly mentioned that you are either not allowed to work anywhere else, or you need permission from your full-time PhD employer to work somewhere else. You can try to request but it will very likely not work.
If you get a PhD position in Germany, you will very likely get a reasonable amount to support your livelihood. It is, I've heard many times, the opposite in Poland. I do not know the legal issues in Poland, but I suspect it must be possible to work. Otherwise, how else are so many students surviving from the money they get from the state?