[sebg]

The 2nd part of the third link (huyenchip's book) has "The second part consists of over 200 knowledge questions, each noted with its level of difficulty -- interviews for more senior roles should expect harder questions -- that cover important concepts and common misconceptions in machine learning." That you can find some good questions to think if it would apply to your company and the goals you'd want the newly hired data scientists to be able to answer.