Northrop Grumman Software Developer interview questions

A recruiter reached out to me and had a phone screening with him. After that it took about a week to get the official followup interview confirmation. They sent me an email with a bunch of information about preparing. When I actually got to campus for the interview their instructions on where to go were really poor and no one was able to help. When I finally found where I was supposed to go I went into the back office with two managers and they talked really briefly about my background. They seemed kinda disinterested from the beginning and the entire interview lasted maybe 15 minutes. I tried my best to talk about my past experience and current projects I've been working on, but it really didn't seem to matter to them.