Oracle Sr Software Engineer interview questions

Submitted through internal referral. Target school+high GPA (3.9+). Direct onsite interview. Before the interview, recruiter provides some teams to select and rank. On the onsite interview, talked to different managers in different teams. All questions are simple and standard. Got an offer the second business day. The recruiter is very responsible and efficient. The overall experience is very positive.

No Offer letter after clearing 6 hectic rounds 1. Written test 2. 3 technical rounds - F2F 3. 1 Telephonic round- Skype 4. 1 Managerial round one of the waste interview process i have ever seen ;6 rounds for 3yr exp guy and each round of min. 1 hour are you kidding me ?, what i noticed is questions asked are 90% same in all the rounds then what is use of 3 technical rounds just time waste. After clearing all the rounds ,i dint get offer from them Just for sake of 25k they rejected and selected other guy who accepted for less offer without asking me for salary negotiation