I am happy to greet You in the community and it is nice, that You searching for answers for Your actual situation.
The fact, that You carry a residence card of Poland allows You only to visit Germany for 90 days in 6 month, that means You could be a tourist in Germany. If You would like to job in Germany, You need a work visa.
I hope, that the answer could help You. I wish you all the best.
Migration assistant MBE-On