I work for the sister airline for Tianjin, but not Tianjin itself.
1. Parc is good. Work for no other.
2. Study your #$@% off for the sim. You will have multiple emergencies simulating missile strikes. They want to see if you can get it on the ground.
3. If they are like my airline, they give you a Chinese tax certificate. Pmail me for details. You should owe no tax in the US, legally.
4. Any other questions, please pmail me.
It is a great gig for a Rj guy from the states, or anywhere else.