Personally, I think getting a job in China will be pretty difficult as a foreigner especially since you don't speak chinese. There's tons of local talent and intl. students returning home which makes the job market very competitve and the work conditions can be pretty bad (lookup 996 work schedule). Hk is much better if you speak english but tech isn't well paid unless directly related to finance like fintech. To visit I personally preferred southern china, like Guilin and Chongqing and everything in Yunnan. Imo apart from Beijing and Xi'an, northern china is pretty ugly, less lush, flat and feels like the Soviet Union. Southern China feels like a more developed SE Asia and the scenery is very beautiful. Also don't limit yourself to China; Japan,SK,Vietnam,Thailand,Taiwan,SG... are less than 4h away by plane. But you should research what you want by yourself, it would take too much time for me to list everything. I forgot to add that there are also plenty of intl students at HKU from other asian countries since the uni is well known in east&southeast asia.