GDIT bought out an existing subcontractor who I was previously working for, and prior to transition I was offered an opportunity to a lateral promotion. Because the promotion wasn't a direct promotion for my existing position, I had to go through the entire application and interview process as if I were a new hire.
It starts by submitting a resume and a cover letter online on the GDIT careers website, which is publicly accessible. I located the exact position that I wanted, and my resume was partially imported automatically in to their application tracking system (ATS). After spending about 30 minutes filling in details of my resume in the ATS, I was able to upload my cover letter and submit my application for the position. Normally I would be contacted by a recruiter at this point for pre-screening and to schedule an onsite interview, but since I was already working onsite, the GDIT site lead and later my soon-to-be supervisor interviewed me on the spot three days later to assess my interpersonal and technical skills. I continued with my regular duties for about two or three more days until the GDIT site lead interviewed me one more time. After a brief 5-minute conversation about my future intents (continuing education, if I plan on sticking around, was I looking at any other jobs, etc.), he offered me the position and we negotiated salary and benefits. The next day I was presented with an offer letter containing my salary, benefits, and a starting date, which I signed and gave back. I started as a new employee at GDIT two weeks later, only because I was required to give my current employer a two-week notice of voluntary separation (yet another contract requirement). If I didn't have to give a mandatory two-week notice, I could have started immediately.