May I work in Germany ?

Hello @kaptanov  , thank you for getting in touch and congratulations on your Bulgarian residence permit. If you want to work in Germany you need a German residence permit that allows you to work in Germany: https://www.bamf.de/EN/Themen/MigrationAufenthalt/ZuwandererDrittstaate… Please read about the different types of residence permits: https://www.make-it-in-germany.com/en/visa-residence/types 
You could apply for an EU permanent residence card in Bulgaria. With an EU permanent residence card you have the possibility to get a residence card in other EU countries, such as Germany: https://handbookgermany.de/en/permanent-eu-residence-permit
If you have any further questions, please let us know. Best, Barbara