Recruiter, Hiring Manager, then pair interview from potential teammates. When asking about my background and experience, the hiring manager specifically asked about my experience with NServiceBus & Terraform, which I noted I didn't have any of, but I am always happy to get/have to learn something new and useful quickly. During the pair interview, many questions were asked and problems given, and I excelled at all, though towards the end, one of the interviewers asked about my experience with NServiceBus & Terraform... to which I said the same as before, I'm always happy to get/have to learn new things quickly. Later rejected, seemingly inexplicably at first. When I dug later, I was told that it was my lack of NServiceBus & Terraform experience which was the deciding factor. Something the hiring manager knew from day one, and yet they decided to waste my time for 2 hours regardless.