Permanent residence in Germany can be obtained if you fulfill certain criteria. However, here we will cover only a couple of them that could be relevant if you plan to work at CISPA.
For more information regarding permanent residence/settlement permit, please check the website content prepared by the Federal Government of Germany, here
Here are some of the various cases regarding acquiring the settlement permit:
You have a Blue Card
You have been working in Germany with a Research Residence Permit
You have completed your MSc or BSc in Germany and have been working already:
You are a highly qualified professional (Usually for faculty members)
ⓘ Disclaimer
If you know now in which way you want to acquire your settlement permit, you can apply to the local Immigration Authority. They will inform you regarding the exact documents required!