During the first stage of the interview, I was asked to develop a piece of working software live, and then iteratively add features to it. I took a strategy to make things time-effective and to not over-engineer the solution. I had been asking some specific questions that I was basing my design and code on. At the end, I didn't pass this phase because my solution didn't match the key. According to the feedback, I was rejected because of the simplifications that I made and was specifically asked about them. I wouldn't mind being rejected if I hadn't asked about these things specifically.