One hour interview involving puzzles, basic Machine Learning concepts. 3 Puzzles were asked which I managed to answer. 2 were straightforward. Third was tricky and needed interviewee's assistance. Initially couple of questions on why Data Science and all ? Then asked me to explain some simple machine learning concepts : Supervised vs Un-supervised learning, Difference between bias and variance. 3 puzzles. A coding question was used to screen people before interviews. 10 of us were called for the same based on our solution to coding problem. (Pseudo Code was enough)