Very unprofessional and impolite ways, first round is phone screening, then 3 individual ones half hour each, for the last one the interviewer did not even show up, so I waited and someone came to apologize after 15min waiting. Some interviewer came into chat without any introduction and left without notification, they don't like smiling and don't greet people or be a nice way to start the chat.

I had four half-hour panel interviews and one presentation. The first interviewer was a senior director. The two interviewers in the panel were junior biostatisticians. The interviewers in the third and fourth panels were mid-senior level biostatisticians.