The phone interview process involved introducing myself, talking about our current work, a coding question, and 5 minutes at the end for asking questions to the interviewer. Very standard format. The coding question was very easy, and I solved it. However, the interviewer wasn't communicative at all from the start. They only introduced themselves in a sentence or two, and after I explained my projects, they asked me really dumb questions about my past projects by picking random keywords from my explanation (I suspect they were zoned in/out when I was talking). In the coding question it was as if I was talking to a wall. I solved the question completely with the output matching their test case output etc, talked about the space/time complexity, and performed optimizations on my own. However, the interviewer didn't give any input at all, and their interaction was extremely limited. It's frustrating to do everything correctly and be rejected because the person on the other end was aloof, zoned out, and disinterested. That's an hour of time I'll never get back.