AFAICT the general rule is that monoglot English speakers are assigned to Poland by their companies. English speakers who arrive here on their own are not necessarily in demand unless they speak Polish as well. I don't know of any company has ever successfully implemented an English only policy for Polish employees (and I've known of a couple that tried and failed) and an English only speaker is generally going to be a burden rather than an asset.
FWIW I work as as a teacher but also need Polish to function in my workplace (which teaches a number of languages).
