Applied online and was contacted by recruiter to set up a phone interview for a position that was different than what I applied for. Interviewer did not seem to know anything about me (hadn't looked at my resume as far as I could tell), or seem to know what position I was interviewing for, and at first seemed to be accusing me of applying for the wrong job. He didn't seem interested finding out either, and instead just started asking some vague questions in a mildly aggressive way. They jumped back and forth between topics, so I was never sure what exactly I was supposed to be talking abut. He kept interrupting my answers after a sentence or two (possibly just because I wasn't answering the question he wanted answered, but that was because his questions were so vague). This was a technical interview with a coding component, which he presented as optional - I had been told this would be a part of it but putting it as optional made it pretty clear he'd already decided to pass on me. I said I'd do it (for the experience) and while what was expected of me was now clearer, he continued to interrupt me when I spoke and eventually I asked him in he wanted to me continue and he said no.
Overall it seemed very unprofessional - this guy shouldn't be interviewing people or he should get some training or preparation before doing so. I felt like I had to be on the defensive from the minute he started talking to me. It doesn't seem like a good sign for the company if this is how a typical interview is conducted, and based on this it is not a place I would want to work (or at a minimum, not a person I'd want to work with). I don't expect to hear back from them and that's probably better for all involved.