There was only one interview (face-to-face) with the head of the division for the position I applied for. The questions asked of me were very thorough. The interviewer would refer to my CV during the interview and would ask me to explain in detail for the information I included in my CV.
I was also tested on my technical knowledge which would be relevant to the job on the spot. It did felt like I was sitting for an examination at one point, and other times, it felt like a tutoring session whenever I couldn't answer the technical questions.
The interviewer was accommodating, willing to answer enquiries I had, and was kind enough to explain things that I do not understand.
The interview took more than an hour.