Four rounds of VO, each lasting 45 minutes. Each round starts with chatting, self-introduction, and BQ, then the remaining time is spent on a Codility question. The first round asked about Connect Four. Then, trapping rainwater. The third round was about Yiwu’s original question. The fourth round asked about overlapping time for two people. After the interview, received an email notification of passing on the second Wednesday after the interview.