The technical assessment was a comprehensive exercise in machine learning. After the technical assessment I was interviewed by two senior data scientists. Both of them were very respectful and their questions were very precise, to the point and comprehensive. It was a very interesting data science discussion. After passing me to the next stage the recruiter told me that they have already filled-up the position I was applying for (why were they interviewing me if the process was already closed?) but she mentioned that they would like me for a different team. The next interview should have been with the lead data scientist of that team. Unfortunately, the lead could not attend and it was replaced by another team lead from a different team. From the beginning, the team lead was clearly annoyed that he had to perform the interview. One of the first thing he highlighted was that his team "has too many people already" and that he was not looking for more scientists (remember that I should have been interviewed for a different team, not for his team, but he clearly did not get the memo). He questioned every single detail of my CV, unfortunately the questions were not very well prepared. When I highlighted that his assumption about one of the jobs was erroneous, he completely dismissed my comment and proceeded to ask a question under the erroneous assumption anyways. Also, he was more concerned about rearranging his hair in front of the camera than listening to my responses. He even questioned my level of education asking about the benefit of a postgraduate education, since he had a lower one. He was completely unprofessional, unprepared and uninterested. A person like him can not be part of a recruiting process. After finalizing this meeting the recruiter told me that they will not proceed with the recruiting process due to some lack of knowledge. I have mentioned this lack of knowledge at the beginning of the recruiting process (3 interviews ago) and at the end I was rejected due to not having it, it was a joke. I felt a complete lack of professionalism and respect towards the job candidates from Ayden recruiter and Data science lead.