Oracle Application Developer interview questions

The interview process was basically divided into three rounds. Two of them technical and one HR. The technical rounds were majorly focused on Data Structure and algorithm. They also asked lots of questions about the projects that you have done. They expect almost all questions to be answered correctly. Another aspect of the interview is the number of puzzles that they ask. I was asked to solve and explain around 3-4 puzzles. Those who couldn't solve one of them or solved 1 of them were eliminated. Every round is an elimination round.