I am not sure about long-stay-working visa permits for Ukrainians in Poland, but I know that for Czech republic, it can take up to several months to have all the burocracy in order.

I know this, because I work for a large multi-national, and my boss always complains when he has to deal with relocating people from non EU countries to Czech republic.

On the other hand, it happens reasonably often, in two years we hired several people from Armenia, Serbia, Russia, Ukraine ...

What about jobs in Poland, do they have Ruby or RoR projects that hiring?