Uber Senior Software Developer interview questions

The whole process is not professional. The interviewer didn't call at first time as scheduled, and no recruiter follows me up until I asked. The phone interview asked two technical questions and coding on shared document. I resolved questions and still got rejected and they refuse to share the feedback. There was less communication during the interview and the interviewer was doing something else. It feels like a teacher is watching you are doing an exam, instead of communicating ideas.