Four rounds of phone interviews, each with positive and timely feedback, followed by a full day of seven group interviews. I felt these interviews were mixed, from the candidate perspective. A couple were disengaged, several were highly engaged, and a couple were arrogant. I followed up with a thank you note to the hiring manager, and I never heard a thing from her or HR again. I invested 1.5 days of my life talking to them, and they couldn’t be bothered to close the loop in any fashion. Unprofessional.