Oracle Sr. Software Engineer interview questions

I was asked to start with an overview of my past experience. This was a technical interview, so the next step was a coding challenge followed by some questions about how the implemented algorithm could be extended. I performed reasonably, not spectacularly. To be honest I did not expect to be ghosted by such a large tech company, but that's what happened. I followed up after six days with their internal recruiter, got no apology but only the briefest of messages saying they will ask around about it. Sixteen days later I asked to at least confirm that I was rejected. Response again had no apology but just stated they were waiting to hear back from the other people. That was two months ago. I don't mind failing the interview but was a bit gobsmacked at the lack of professionalism from such a major player.

Coding interview - data structure related. The problem was related to how well you apply object oriented programming. The problem was given and you have to code at real time and explain why chose the particular solution