If your potential professional is in possession of a visa or residence permit for the purpose of seeking employment, he or she is entitled to perform trial work of up to ten hours per week. This allows you to get to know the applicant better during a trial workday and to assess the profile of the international professional.
If you wish to employ an international professional with a job-seeking visa and sign an employment contract with her or him, she or he can apply for a residence permit for qualified employment at the relevant Foreigners’ Authority in Germany without leaving the country first. It is important to note that the qualification of the international professional must correspond to the employment.
Federal Employment Agency (BA)