Oracle Developer interview questions

I emailed a manager for Internal transfer. He replied back and set up a Phone interview with one of the Principal engineers. But eventually had 2 phone interviews. The first interview was with the manager and second with the principal engineer. I had to schedule interview 2-3 times because the Principal engineer couldn't come up with a time. Also, one time, we set up a time but the engineer never called. We had to setup again. Apart from that, overall a positive experience. Will apply again after some months.

5 interviews with diff teams. Describe projects - qs like tail recursion, linked list, dynamic memory allocator, C , Java etc. Flew me in and paid for hotel and food. 2 day stay. Sent a limo or i had the option to rent a car and they will pay for it. Interview was easy and i was interviewing at ex Sun Microsystems branch so i am not sure if this applies to standard Oracle.