I was contacted by the recruiter on LinkedIn. - A first technical interview with a data scientist (DS): coding test + knowledge test (regression algorithm) - a homework, made of 2 exercises (time series analysis + software development) The technical interviewer was very nice and the discussion sounded like a conversation between two DS (and not like a test given by a teacher to a student) so it gave me a good impression. Unfortunately I was very disappointed by the way I was treated after returning the homework. I was told there was no time limit and that there would be another interview with a DS to discuss more about the 1st exercise (time series analysis). Instead, I did not have that chance and was rejected after having returned the homework for the main reason that the analysis was not "thorough enough" for the examiner. Since it is supposed to be not limited in time, they could have simply asked me if I could "dig" a bit more... (I decided to return the homework when I considered I had answered the questions, knowing that I was not supposed to spend too much time on it.) Anyway, considering that I spent several evenings to work on it (since I have a family and a job that keep me quite busy), I really think this is a lack of respect and consideration to not even let the candidate defend his work with the examiner. In addition, the homework itself let me some bad impression of the company, notably regarding the 1st exercise (time series analysis): - The questions were not clear at all (even the recruiter felt he had to explain them even before sending the homework). - No effort was made obviously for the presentation (instructions given in a simple text file, without any formatting... It didn't look professional at all and you could wonder if they expect the same quality from you...). - The exercise was quite scholar (with several oriented questions) and did not reflect the real daily work of a data scientist.