Wealthy foreigners managing their local businesses should stay in their outsiders' enclaves and not fraternize with the locals; they're likely to end up beaten to a pulp or worse.
There's a whole subclass of foreign bums; people who somehow got to Shanghai but ran out of money. They have enough to get by for a while, but not enough to leave. They hang around tea houses looking disheveled. Their eventual fate is not good.
A consultant can fly in, install a computer network, make $50K in a week, and fly out. The medical system is completely broken; there aren't enough ambulances or hospitals. Don't get sick there.
Welcome to the gold rush!