I've been contemplating for a while, how much does it make sense to move to Shenzhen for a while to understand how production works. How important is it to speak Mandarin ? Are there companies hiring, where I could get a glimpse into that?

Of course like many others I'm spoiled by SF salaries, however I've noticed that there are huge numbers of valley hardware startups and crowfundings and most of them fail when it comes to actual production.

Ps. I'll probably get this when I'm home, but am curious if any of these questions are answered there.