The conversation with the HR responsible was very nice and professional. She asked about data science in general and why I am looking for another job, etc. However, the conversation with the IT person was not that good. Most of the question were not related (it seems they were from his field). Before the interview, I checked to whom I am going to discuss and I found that he is an IT Engineer at the company (basically lower in the hierarchy than the offered position). This did not cause any problem to me but at the interview, the interviewer was surprisingly very offensive.