In the beginning, they will briefly introduce their company. And then they will ask you some working experience, answer in Cantonese is ok. Try to take the initiative to ask more questions. It requires the skills for handling high traffic website and security problem.

First round: online interview with hr and team leads (around 30 mins). Second round: on-site interview > technical task > meet the team leads, they will ask more deeply about technical questions based on your resume