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:
ⓘ 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!