Only a single round face to face talk with team head. Everything was causal. You are suggested to talk more how your previous experience could be related to your position. Everything is casual. I was wearing an T-shirt with a jeans, plus converse to attend the interview and It just fine. The interviewer was very nice and willing to explain your job duties clearly and patiently. Interview was conducted by native English speaker. Despite a Hong Kong company, most of the staff are Westerns.