I'm from the Netherlands, which is parttime king of the world.
I haven't worked in a fulltime software development job for almost two decades now. Never has it been a problem. Never was my parttime requirement the reason to not hire me. I don't even consider fulltime an option.
I'm very surprised at how people here react to this idea. Untill you pointed out it may be cultural thing.
Another reason for me to not even consider working for a US tech company.