You hire people remotely, but they have to speak polish?
I mean, I'm italian (from Italy, not NY :p), and I would only require English because it's just the main language in tech in the current period of time.
Since you're hiring and working remotely doesn't this severely restrict your hiring pool?
This might be a bit controversial (purely my opinion, not company's) but I think that you'd rather either go full monty and employ 100% multicultural crew or rather stick to a 100% monocultural group. Why? For easier communication.
I recall a situation, working at my previous work, where we hired one guy from South America. His tech side was impeccable, his English needed some brushing up, he's really amiable yet the main problem was people not always switching to English with him around. Not out of malice, some people weren't that comfortable with Eng.
/ EOT ;)
I am Greek/Italian, with a good command of both langs, but talking about development or even IT any other language than (my poor) English it's cumbersome.