Northrop Grumman interview questions

Contact by a recruiter to set up an interview. The recruiter set me up for 9:30AM but send me confirmation email from 9:00AM. I wasted 30 minutes sitting in Team call. It was a red flag and feel like the team is incompetent. The salary i got was $18k less than other aerospace company. They did not want to negotiate. Overall bad experience and bad employee. I declined the offer.