3 rounds of interview with the team members and one final board interview with a technical question. This process took around 3 weeks to finish and I never heard back even after telling me that HR would reach out.

Probably one of the worst interviewers I've experience in my life. I've interviewed with spaceX, Apple, and Facebook and none come to as bs as Resideo. For a position that's supposed to be a grad student's position. The interviewer was aggressive from the beginning and asked questions about topics one may not have studied in over three years. After asking some technical questions, he kept getting into more irrelevant things such as "give us an example where it is used", "how does it work", "when will you use it". Note this might sound easy because you are reading it but during a live interview, out of anything that could be throw at you, the most random questions were thrown at me.