What will be the requirement to get the EU blue card -Poland if non EU resident applying from other countries ..
According to this, you need a work permit or binding job offer before you can apply for the card:-
apply.eu/BlueCard
According to Wiki:
"Acquisition of Blue Card has the following requirements. The applicant must have a work contract or binding job offer[14][15] with a salary of at least 1.5 times the average gross annual salary paid in the Member State. A Blue Card acquirer must present a valid travel document (and in specific cases a valid residence permit or a national long-term visa) and documents proving the relevant higher professional qualification.[16]"