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 researches I performed. Another part is mainly on the reason why I select Rakuten. At last the career plan is also needed. The second interview is about programming experience. But skill details are not needed. He focused on what kind of problems I met and how I went through. The third one is rather simple just like chatting, about salary and working position. Both Japanese and English are ok.