Rakuten Software Engineer interview questions

I applied the job on a HR company from Singapore. The application has many phases including programming test, video Interview, face to face interview and the final offer meeting. I did not pass the face to face interview. The programming test was a two-dimension math problem. The video interview has provided the question for you. It's easy. If you passed above phases, you'll contact to do a technical interview. The interviewer asked my understandings about web, db, load balance... and the specific job I wanna do in this company. I thought I didn't do well in this interview.

1. CV Screening 2. Online coding test and recorded interview 3. Onsite interview