Northrop Grumman Software Engineer IV interview questions

I was contacted by HR. I already had a general profile with NGC. They added the position to my profile and called me to complete it by answering a few background questions. After that she set up a phone interview for two groups. The phone interview was a conference call.

Short phone interview with HR. Followed by a 3 hour technical on site interview and 30 minute interview by the hiring manager. The HR interview was a screen. Met with 3 engineers on the hiring team. Some technical questions relevant to my resume, other questions are your expected algorithm tests. Meeting with manager was solely for the salary negotiation.