Phone then Takehome assignment then onsite. Met with founders, software engineers and data scientist person. The process is pretty rigorous and requires a strong coding background. Details: Takehome exam with very messy data that had very high cardinality. Even the hold out set may have categories that your train set has not seen yet. A lot of observation of the data is necessary. After that, you go on site and get 3 software coding interviews. Pretty heavy duty coding questions. E.g. find all possible ways to evaluate the multiplication of 4 numbers in a N by N matrix. Also, map reduce and deep recursion problem.