10-12k? When iOS developers with just a few years experience are clearing 10-15k here in Krakow?
As i checked there is no such background like me so i can not find a specific salary for now.
People with these skills/experience are rare and get snapped up pretty quick, but you'll find jobs will be in the major cities. You're looking at 20k/month net if not more, particularly if you're willing to work in Warsaw. Check out what's being advertised on LinkedIn and talk to some of the IT recruiters.