Did an onsite for Google L4 a little while ago this year.
3 YOE

Coding #1
https://leetcode.com/problems/find-leaves-of-binary-tree/
Followed-up with an LC hard variation

Coding #2
Variation of https://leetcode.com/problems/koko-eating-bananas/

Coding #3
Variation of https://leetcode.com/problems/minimum-area-rectangle/

Coding #4
Variation of https://leetcode.com/problems/course-schedule-ii/