Oracle Software Engineer interview questions

Interview process consisted of two technical interviews and HR round. Before commencement of interview there was one written coding round consisting of four questions out of which any three need to be attempted.This round was zero elimination round.

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.