1, through a wealth of professional headhunters in China to introduce foreigners to employment
2, to find your friend's local professional international headhunters to find China's relevant job information.
3, through some of the friends in China's introduction, directly find just the right demand for units to hire your foreign friends.
(You can ask your friend to keep an eye on the foreigner employment websites of some big talent companies to look for information.)
But in my experience, if a foreigner is looking for a Chinese company abroad, the interview or other details will require a lot of negotiation with the interviewer. Relatively speaking, it is slightly more difficult than for foreigners living in China.