I applied online and got a call from HR. It was rescheduled 3 times, and the 4th time, the interview was taken. It was the first technical round. Basically, problem-solving skills along with hands-on coding were the main focus. I was asked to write code and finally asked to copy-paste all the code in the chat for audit.

1. Custom Implementation of Re-Entrant Lock.
2. Design Tiny URL.
3. Design Parking Lot.
4. Zig-Zag Traversal of Tree.
5. Vertical Traversal of Tree.
6. Two LinkedList are sorted and we need to merge them, and the final LinkedList should be in sorted order. Time Complexity should be less than O(n log n).