It seems there weren't any.

First, please note that the following experience occurred at the end of 2015, so it may not be accurate now.

Around September, HR proactively contacted me for an interview. Because I wanted to receive my year-end bonus from my current company, I replied that the earliest I could start working at the new company would be early the following year, and there was no further news for the time being. In November, HR contacted me again. Since she seemed very sincere, I decided to schedule a Skype call to talk first.

We originally arranged to have the Skype call at 7 p.m., so I rushed home in a hurry, but they ended up coming online about half an hour late. Not only did the interviewer come online late, but HR also did not come on first to say hello. Two young engineers, one man and one woman, interviewed me via Skype. They did not seem particularly prepared; it felt as though they had just been pulled in after finishing a meeting. This may be my personal bias, but I felt their tone was full of arrogance. They asked about the work and contributions from my previous job, including some technical details. It ended after about half an hour.

Perhaps we all felt that we did not have much to talk about. I was also rather dissatisfied with their overall attitude. After that, the process went silent, and I couldn't be bothered to ask about the follow-up.