Avoid working for local companies in Poland unless you like low pay. Just find yourself a nice remote gig (there's plenty of them if you know how to find them) and live like the top .001% of the country or whatever. There's a good reason why being a "digital nomad" is becoming more and more popular.

Healthcare starts at ~$130/mo if you manage to not pay for the retirement fund scam (rarely possible), goes up to like $350/mo if you run your own company (not 100% sure, I can thankfully avoid it). The income tax is 19%.