Applied online and received a call a week later. I didn't mention the role beforehand and thought it was for the platform core team, but it ended up being a DevOps interview.

The first and second round interviewers were very professional and had okay knowledge. They were not that proficient in Java.

For the third round with the manager, I didn't answer one question, which was my mistake. However, for the other two questions, I answered with three to four variants. He seemed to be expecting a specific answer he already knew.

Keep track of the maximum element in a stack for all elements inserted and then popped.

Given an array containing elements only of 1, 2, or 3, and an array size of 'n' with numbers in the range of 1-3, how to efficiently sort it?

Intersection of two linked lists: find whether they intersect and, if so, their intersection point.

Reverse a linked list.

Print valid balanced parentheses for a given number.