Ancestry Data Science interview questions

A recruiter contacted me to have an interview. The first step of the interview was to talk with the senior director (my eventual supervisor). The interview started with him giving me an overview of what ancestry.com does. Next we delved into my dissertation research and giving him excepts about how my research can benefit the company. Next we talked about the what big and complex data sets I used and how I handled them. The 2nd round was a coding round. This was very different from what I have encountered. The interviewer emailed me a question paper (1 problem) and called to clarify if I had any questions. The aim was to write a piece of code with an hour and email him back the code with test cases. Next they flew me over to SF. There I was scheduled to have 5 rounds of interviews out of which 1 person did not appear. With the other 4 I mainly talked about my research and some "tricky" DM/ML questions. I was informed that I will have 1 more round of telephonic screen with the person whom I was scheduled to have an onsite interview. The last TPS was again a heavy coding interview (google docs) where I was made to solve 2 questions.