Edit: OTOH, this is no reason to go with a bang - releasing some pressure is just not worth it.
What makes you think Google is better?
Google pays decently, but the work isn't interesting unless you have social access. Being in an Eastern European satellite office, you're not going to get the machine learning work. You're going to get the stuff that California, Seattle and New York don't want to do.
I'm sure there are Polish companies that offer real work; OP would do better at one of those than in some multinational's branch office. The problem is that most corporations are still pretty colonial and you don't get high-quality work unless you're in the main office.
Statements from friends who work there plus knowledge from seminars they sometimes organize with Warsaw University. Example (Polish language warning :-) ): http://students.mimuw.edu.pl/SR/rok12-13/Google.html
Short translation of the above link: cluster management, availability management, load balancing. OS-level things, definitely not maintenance of a legacy ticketing system for "real" devs in California.
The only thing that matters at Google is your rank and your "calibration score". That, and nothing else, determines what projects are available to you. If you're willing to spend 5+ years playing politics and trading favors in order to get promo story you need, then you can get something passably interesting.