First, they will shortlist you based on your resume. After that, there will be an online test of 1 hour with two LeetCode-type questions. After you pass that, there will be a technical round. In the technical round, there will be two managers who will ask you questions about your experience and projects. After that, they might ask you to solve two or three LeetCode-type questions, and this interview will take 1 hour. After that, there will be a final interview where they ask you why you want to join Rakuten. I have given the final interview; I got rejected, and I don't know why. They don't give feedback, which I consider bad.

Medium LeetCode. Why do you want to work at Rakuten? Etc.