The process consisted of four interviews and a use case that I was asked to solve in advance. The first interview focused on the solution I prepared (code + plots); the second interview was more generic; the third interview was an assessment of my coding skills; the fourth interview was HR-related.
First interviewer: To my surprise, the interviewer was under-prepared and had not read the solution I provided. The definition of the use case was not clear to begin with, neither how they wanted me to analyse the data. I was disappointed to realise that I wasted my time to prepare for this part.
Second interviewer: The questions were focused on the interviewer's expertise rather than the role I applied for, which makes little sense. I assume the interviewer was not confident enough to touch knowledge areas beyond his/her expertise.
Third interviewer: The coding interview consisted of a couple of warm-up questions and some tasks. The interviewer was very polite.
Fourth interviewer: This was probably the unique worst HR interview I had in my career. The interviewer was *aggressive* and ignored completely my feedback. Instead, he/she reported his/her own biased perspective. Very unprofessional.
Overall experience: It's a company that it is still discovering its identify. The people working there are mainly of junior level which impacts the interviewing process. There is also little room for actual data science (even applied) in this company; thus the confusion about the advertised role. To sum it up, what I experienced I did not entice me to want to be part of this company.