Very involved process. I first did a fair online coding test on codility. It was a question involving overlapping rectangles, min maxing, basic math etc. You can use any language you like. After that, Rakuten asked me to submit a video answering a list of questions. Did not have a webcam or the time to submit the video so I stopped the interview process after that.
Interview questions [1]
Question 1
The coding question was the intersecting rectangles and 5 prerecorded questions that are also posted here.