What your contract type does to your residence permit
A single permit in Poland names an employer, a position and a salary. Change the contract and you change what the permit was granted for.
Tag
Employer-Change
The single permit against a separate work permit
Poland lets you legalise work and residence in one case or two. The route you are on decides who files, what it costs, and what a job change does to you.
Your employer changed mid-application. What you must report
A job change with a Poland residence application still pending is not the problem the 15-working-day rule solves. That rule belongs to permit holders.