Oracle Software Engineer Senior interview questions

It have three rounds of interview .all three were technical. No hr interview happened for me.First interview was covering java and spring concept.second interview covered data structures and bit of system design and the third interview again data structures programing and some java concepts

Tech Screen + 5 rounds of onsite. Did not make through the tech screen. The problem is a variation of n-queen but complex. Even though the interviewer was happy with how I performed and also gave a soft yes directly in the interview, I was letter rejected, the possibility being that the role was filled as I postponed this for a long time.