Retweet someone from your list might just be applying to study in Germany without your knowledge.
As an international students, you are allowed to take up part time employment along with ur studies
1. You can work for a total of 120 full or 240 half days in a year as a student. However, might vary. If your university is in a city which has high unemployment rates, or more manpower, you will get a work permit of more than 120 days.
A. Teaching/Graduate/Research Assistants at the University. This jobs are open to research scholars and pay decent enough cash. You have to be really good and apply early to get one. These jobs are advertised on the University notice boards and with department