This was for the Seoul branch, so I imagine this wouldn't be applicable to 99.99% of all potential Oracle applicants. I spent a day going through 5 on-site interviews with 5 engineers at this branch for the software engineer position. The interviews went well and none of the questions were difficult. After constant communication leading up to the interviews, I was ghosted completely despite numerous emails asking for an update. Afterwards, I received another email asking to be interviewed by another engineer for a different position. I accepted and that interview went well as well. I was able to successfully solve the binary search tree question completely. After a week, I asked for an update and was ghosted completely again. Completely unprofessional behavior. You're telling me that none of the 6 people that interviewed me couldn't have simply provided a courtesy email? I was in direct email contact with 3 of the engineers to set up the interview, and neither responded to any of my emails after the interviews. Oracle is a terrible company. Applying for Oracle, and especially the Seoul branch, is a waste of your time.