Mercury Systems Software Engineer interview questions

Applied online and received an email from a recruiter a month or two later asking for interview availability. Responded within the same day, but the recruiter failed to check their email, and emailed me a week later asking if I had received their email about requesting an interview time. Responded same day and scheduled an interview for a few days after. Recruiter explained the role and asked a few questions regarding experience, then went over the next steps if the department manager was interested in moving forward. The recruiter gave me his word he would keep me in the loop (if or if not my application was to move forward) within 2 business days, but never heard back from said point of contact.

Scheduled an interview with Mercury, only for them to be absent during it because of a calendar mistake on their part. Rescheduled interview and had a regular screening call. Asked for updates and got a chance to schedule an interview with a manager. Day of the scheduled interview,they sent an email asking to push back the interview by an hour, to which I accepted and received an updated interview meeting link time. At the new interview time using the updated meeting link I was left again in an empty meeting room. When asked for an explanation, they said they'll see what went wrong with no resolution of rescheduling another interview. Overall it was a negative experience and disrespectful for an applicant's time to be wasted like this.