Oracle Senior 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.