The interview process went from Engineer -> HR -> Co-founder (Taiwan) -> Co-founder (US), and it was also very long, taking about a month in total. You can develop patience and improve your question-answering skills throughout the process, such as how to build an automated architecture like Google's.

After passing four rounds, the response I received was that the company was not confident it could work on automated testing, so they decided not to hire me. But the whole series of questions beforehand, as well as the managers in each round, were all asking about these things—so how could they not be confident enough to support working on this area?? I really don't understand. It seems that even the so-called Co-founders don't know what they want to do or what they are looking for. So... if you're going for an interview... just leave it to fate.