First round was primarily behavioral, asked about projects and scalability.
-More examples: why microsoft, tell me about a failure, etc.

Second round: Similar, but not exact to --> https://leetcode.com/problems/valid-parentheses/
-Problem had more constraints, such as no numbers, and any amount of characters in between parenthesis

Third round: Implement the String.split() function from scratch.
-Follow up: have it match multiple character patterns
-Follow up: what would you do if you wanted to move this method to production?
Answer: Testing, write JUnit tests
-Follow up: write 4 JUnit tests (java)

Results: I passed every question almost flawlessly, explained myself well, asked clarifying questions, seemed to get along with everyone, but unfortunately did not receive an offer. No explanation was given. I believe this was an interview for Cloud Platform group