3 interviews.

The first is about 1 week after sending my entry sheet. All the interviews are by Skype, and the employer is likely to ask you about the research you performed. Another part is mainly on the reason why you selected Rakuten. Lastly, your career plan is also needed.

The second interview is about programming experience, but skill details are not needed. The interviewer focused on what kind of problems you met and how you went through them.

The third one is rather simple, just like chatting, about salary and working position.

Both Japanese and English are okay.

Researches? Why select Rakuten? Programming experience.