It was a phone interview. The interviewer started with telling me something about his team. The he asked questions about my resume and the projects that I did before. Then he asked me to do a monte carlo simulation and asked me to code the simulation over the phone. The question was not too difficult, but given that we only had 30 minutes in total, it was a little bit rush for me. He told me I could choose any language, and I chose to write the code in R. But he seemed to be not very familiar with R . I do not know why we did not use the coderpad. Coding over the phone is not very efficient. The interviewer seems to be in a rush. Usually the last part is to ask the interviewer questions, but he said we ran out of time and hung up the phone without letting me ask questions.