> Warsaw is generally more expensive than other cities in Poland, so you don't need to limit yourself to one city in your search

Yep! Krakow, Lodz, and the other various cities have become cost effective and built hiring pipelines as well.

You see this all over the CEE and India as well, such as Czechia (Brno, Ostrava), Romania (Cluj thanks to the Transylvanian government, Timisoara) and India (BLR/Pune/Hyd/Gurgaon to Tier 2/3 cities)