First they send you a calendar request, BUT it doesn't work if you don't e-mail them directly. It looks like they have an inefficient recruitment process because the interview was very difficult to coordinate. The recruiters ( because I was talking to 2 different person from the same company) re-schedule the interview several times, like they do not have experience doing it.

First, scanning interview with HR recruiter, who will went through your CV briefly and advise about the processes. After that you will then with Hiring manager. If you passed this, you will need to meet with Team member(s) and Crossed-team member(s) to ensure the fit. If you are applying for a role with specific language, you may need to meet with another person to test on your language capability.