Northrop Grumman interview questions

Received email from HR to respond to email if interested in job. I did not actually apply to the job. I had spoken with an hiring manager at a career fair and believe through his referral, I was able to get an interview in the functional area that I wanted. However, I was disappointed that HR did not call me to schedule an interview but rather sent an email. I could have missed the email. After interview was scheduled, I was told that 2 people would interview me (senior manager and junior employee). When I arrived for the interview, only the junior employee interviewed me. I was told that the senior manager was otherwise engaged in more urgent matters. The interview was okay. Some questions were more challenging than others and I didn't adequately prepare to answer certain questions. After the interview, I contacted HR to know a brief time line of when I can expect to hear an answer. HR pushed me off for 2 weeks or so and I never heard back.

Submitted my resume for the position a year previouse. Recieved a phone call out of the blue a year later asking me if I was interesded in the systems engineer job. I said yes. I talked to the manager for a half hour and then scheduled a sit down interview and a presentation for an hour in front of 30 people. It went well and I recieved an offer the next day.