Work Permit type A is for a foreigners who work on the territory of Poland for an employer whose headquarters, place of residence or a department, institute or a another form of organized activity is located on the territory of Poland. The foreigners also have to legally resides in Poland. They need a visa, a Schengen visa, a temporary residence permit, on the basis of visa-free travel.
So, how to apply for permit? The employer applies for a work permit for a foreigner. A foreigner can perform only this work which is specified in the permit. If they want to change job they need new permit. Exception is when the same employee gives them different kind of work. In that case permit stays valid.
If your documents are in a foreign language, they have to be translated to Polish by a sworn translator.
Documents added to the application needs to be submitted in the original or officially certified for compliance with the originals (exceptions are identity card and passport).
Work permit type A will be issued if salary for work won’t be lower than the general salaries of employees in a similar position or other employees having similar job.
Your employer is applying for your permit, so you don’t have any additional costs.