I am a non-EU resident of Poland, and have 2 jobs.
One is where I am employed 1/5 of the week (part time contract) and where my ZUS etc gets paid. Since the beginning of the year, I do not have minimum wage from this place.
The second job is on the basis of umowa zlecenie, where my ZUS was so far not being paid because it was unnecessary.
Has it now become necessary to have my ZUS paid by this second employer because I no longer earn minimum wage from any one job?
Depends on few factors - type of work, type of ZUS coverage etc - get a Polish speaker to talk you through the examples in the ZUS guide on umowa zlecenia
Or ask the HR dept of the second business. Or ask an accountant for clarity.