Cancelled interview 3 times, and asked to schedule a 4th. Once or even twice is understandable for any reason, beyond that shows disrespect for the candidate's time. Refused to provide a salary range for the role.

I was notified that the whole process would be five rounds. My first interview was with a recruiter, than two interviews with the hiring manager, a panel interview, and the fifth would be with the head of product. The second interview with the hiring manager was a whiteboarding session where I was required to write out the Product Life Development Cycle.