Northrop Grumman Associate Systems Engineer interview questions

I applied online to a number of jobs on the Northrop website, and I also received an internal referral from a alumnus of my university. I was then selected for a phone interview a couple weeks after submitting my application. The phone interview was pretty brief. They asked me a couple questions regarding my experiences in some of the engineering skills they listed in the job posting. After this they opened the rest of the interview for me to ask questions for them. I asked them a number of questions. A couple days later I got a call from the recruiter with an offer.