For only a year they might not need a permit at all, regardless of the position. Sorry but I'm not 100% certain for the rules outside agriculture and language teaching. There's more info:The construction season started in Poland and many employers in our region try to employ Ukrainian workers without permit. One of the employers is threatened penalty in the amount of 3000 PLN. What can you do to hire an Ukrainian legally?
It turns out that the employment of an employee from the Eastern border for a specified period is not too complicated. More paperwork you need to get with the employment of a foreigner for a period of three years.
-There is no longer a police operation. It took labor inspection . If during the inspection of a particular employer the authority will determine that the company employs Ukrainian worker without a permit, it will be fined 3,000 zlotys - says David Baran of the District Labour Inspectorate in Rzeszów, Poland.
From another post:Obtaining work permit based on self-employment in Poland
My friend just obtained karta pobytu. He would like to get work permit based on self-employment. He's a non-EU citizen.
Is it possible for him? If so, what does he need to do?
If he posses "karta pobytu" he is eligible for establishing his own firm in Poland like every Polish citizen.
migrant info pl/conducting-business-activity-in-poland-by-foreigners.html
migrant info pl/conducting-business-activity-individually-self-employment.html