No. An invitation is a document that entitles a foreigner to apply for a visa. This document does not legalize the stay or work of a foreigner.
Employment of a Foreigner
An application for extension of a work permit must be submitted not earlier than within 90 days and not later than within 30 days before the expiry of the validity of the permit.
If the residence and work permit relates to work for the same employer and the same position as indicated in the work permit, the work permit will expire by virtue of law on the day the temporary residence and work permit is issued.
An employer within 7 days notifies the Governor who issued the work permit in writing of the following circumstances:
No, unless we are dealing with a transfer or transformation of the employer.
The application requires the PKD symbol related to the performance of work by a foreigner and indicated by the entrepreneur in the following registers: the CEIDG (Central Register and Information on Economic Activity) and the KRS (National Court Register). This applies to both the employer and the employer-user.
The decision is repealed. In order for you to work legally for a new user-employer, your employer must obtain a new work permit.