Walmart Data Scientist interview questions

Applied through the website. Got contacted by HR after 1 week. Asked general questions about the resume. Introduced to a particular group called customer promises which mostly works on OR problems. Got a phone interview after 1 week. The interviewer asked very difficult questions which have little relation to OR. Really difficult to communicate with the interviewer during the interview, especially he asked about geometric problems and we didn't have a whiteboard on which we can share illustrative figures. The same thing happen when I introduced him a DP algorithm, really hard to do that by just talking , without a whiteboard.