How is the job situation in poland for Non EU members who want to work at language schools to teach English?
Practically non-existent. Forget about it, that ship sailed years ago. Any need can be met with EU-nationals and permanent residents, and wages have stagnated to the point where they are not at all attractive. You might not even break even. The situation is essentially the same everywhere in the EU. If there are any green pastures for TEFL teachers, the are in Asia, especially the richer Arabic countries.