Meta Software Developer interview questions

I did on-site initial screen. In which I answered almost three technical questions and had very good interactions with the interviewer. So I left feeling pretty positive, there was no followup after that for another week and a half. After touching base with the recruiter, they took another couple of days and was followed by a rejection email. Wish I would have gotten some sort of feedback, as I answered everything optimally and also had good feedback from interviewer and conversation afterwards.