I was contacted by a recruiter for a senior manager job. I had initial phone interview. During the interview the interviewer was very complimentary about my technical/development background and he told me that my experience is very good as a principal engineer. He then asked me if I would be open to that position. After that, I they arranged for phone interview for Principal engineer position

The interview process is focused as usual on leadership principals. There are plenty of materials available online. Make sure to map you experience to each principal. Try using ChatGPT to prepare for the interviews as well.