Oracle Senior Software Developer interview questions

I have gone through 4 rounds of interview. Got selected and got offer letter but they took much time for the BGV. Meanwhile I resigned and rejected 4 offers as I decided to join Oracle. After 2 months, they asked my first company current address details which was closed. I said the same and provided all the documents they asked. Still they rejected my offer after 2 months.

I found out about the job through a referral and fast-tracked through to the onsite stage. The bulk of the interview was 4 hours of dehumanising, humiliating and frustrating whiteboard coding exercises conducted by different members of the team that was hiring. There was very little focus on the company and what it is like to work there or cordial interaction; just gruelling hours of back-to-back writing on a whiteboard.