Long process and lots of work (presentation) only to be ghosted in the end by all 5 people that interviewed me both individually and on a panel, and the recruiter too.

Only got to the hiring manager interview. I applied online and then the recruiter reached out to schedule the initial screen, last minute (the same day) contacted me saying they need to reschedule. 2nd try was a go and had my initial screen where she walked me through the process and asked all the basic questions (why Apollo, experience). I then got scheduled for the interview with the hiring manager. This one got rescheduled again last minute. After speaking with the hiring manager got an automated rejection email saying nothing actually valuable or concrete about why they rejected me. I thought the conversation with the hiring manager went really well, in my opinion, but that's not how they saw it. I really would want to see companies treat their candidates with a bit more respect, after putting in hours of preparation and at least provide a concrete reason for their rejection.