GlassPoint Solar R&D Engineer interview questions

Had my final onsite interview preponed and got to know about the evening before via voicemail which was confirmed by Recruiters two hours before the interview next morning. Interviewer were pleasant to talk to and questions asked were more related to previous research experience. Got to know about rejection via automated company mail, the recruiter did not even bother to write about any feedback. Extremely unprofessional and frustrating recruiting experience