What do I need to qualify for the Researcher residence permit in Germany?

The core requirement for the Researcher (Forscher) residence permit is a hosting agreement, or an equivalent contract, with a research institution to conduct a defined research project. The institution can be any body that carries out research, from a university to a corporate research department.

This hosting agreement is what distinguishes the researcher route from an ordinary work permit: it ties your stay to a recognised research project and host. Securing that agreement with the institution is therefore the essential first step before you apply.