If you who don't have either the residence permit nor a visa issued by another Schengen country or are not coverd by the visa-free movement, you need to apply for a visa to Poland before arrival.
https://bkm.pollub.pl/welcome-point/legal-matters/visa
General Info
If you wish to participate in Erasmus Staff Mobility for Teaching at LUT youare obliged to complete the Application Form and Staff Mobility for Teaching Agreement.
https://bkm.pollub.pl/exchange-staff/teaching
Projekt współfinansowany ze środków Unii Europejskiej w ramach Europejskiego Funduszu Społecznego, Program Operacyjny Wiedza Edukacja Rozwój 2014-2020 "NAZWA PROGRAMU" POWR.00.00.00-00-z000/00-00