Northrop Grumman Software Engineer interview questions

I was interviewed by two people. I basically talked about the experiences on my resume. I got a call about an offer, but they low-balled me about $20K lower than my current salary. Other companies were able to offer me about $10K to $15K more than my current salary. I kindly declined the offer. I suggest salary increases for potential employees. Software engineers in this area are highly sought after and other companies will most likely offer higher salaries.