Interviewed twice by the same person multiple years a part. Was a very similar format and interviewer felt uninterested in interviewing me. Not sure what else to add here. This was for a support data Scientist role a few years ago.
Interview questions [1]
Question 1
Design an experiment to understand YouTube changing product. What KPIs? What design?
It was all good, the interviewer was very nice. Technical questions were a bit challenging but overall it was good. The hiring manager was looking for some hands on experience
Back to back interview.
[1]. Mainly ask ML concepts, e.g., how to develop a classifer for youtube video; they will also ask some statistical concepts
[2] Coding for both python and sql
Applied at PhD level so I had two back to back technical interviews. One all stats concepts and the other talking over a hypothetical experiment design and walking through my thought process.