What to look for
The grounds may be related, for example, to Polish origin, the Card of the Pole, certain family circumstances or protection. Long-term employment does not in itself mean the right to permanent residence: for some foreigners, the appropriate procedure would be the status of long-term resident in the EU.
Practical difference
Do not confuse the indefinite validity of the permit with the validity of the issued card. Before filing, find your specific case in the official instructions and gather the evidence for it. Application and issuance of plastic - separate stages.