Seems like Europe is a "maybe" >>35428210 and Canada is a "yes" >>35427290
I also looked it up on LinkedIn. Out of 148 employees marked as working in engineering on LinkedIn, only 14 are based outside the US - and all 14 are in Canada.
Some older comments in Who is hiring? Threads say "continental US preferred", and "US timezone preferred", but these comments are a few years old - although the data on LinkedIn seems to imply that this is still the case.