The entire process took about 1 month. It depends on what position you apply for. They may get the full time trainers as the interviewers. Technical questions are expected. The interview session will take about an hour at most. I was asked 3 techical questions during the interview. Other than that, the interview process is fairly standard.

Formal and professional. It was a zoom online meeting and there were 2 interviewers. One was the hiring manager and the another is the HR. The interview lasted 30 minutes.