It was pretty demanding. You have to complete a series of technical and behavioral interviews with the professor you will work with. The process was very conversational so there wasn't great pressure on you if you really don't know the answer to a question they asked.
Interview questions [1]
Question 1
What's your greatest obstacle encountered while doing research and how did you solve it?
I applied online. I interviewed at Nanjing University (Nanjing, Jiangsu) in Jan 2017
Interview
Project discussion on my previous work. We went through my CV, and the projects I have worked on, plans for future, why research, why Nanjing University. Any teaching experience. Written test, oral test, a mock class.