Varies, depending on location and experience. Min 2700 PLN, max 8500 PLN, average 5691 PLN per month.
If you are completely new on Polish IT market, then hire a "body shop" to make you a team. There is couple of businesses of such profile. I believe in Wroclaw SMTSoftware do such a job, also maybe PowerMedia.
So you need professional headhunter, because IT people rather don't look for work at state job agencies.
I think that firm like SMT could build you a team. They did that for example for Microsoft Bing project.
You could also try to post your offer on sites like praca.pl or praca.money.pl, etc.
Anyway, I know a guy who have worked in that Bing project but some time ago went into Android thing. There is also another guy who for many years was working in Symbian, but since a year moved into Android. But I doubt any of them would work for salary posted by boletus. You can PM me with details of your offer, and some credentials, then maybe I can move it forward...