I worked at ManTech full-time (More than 10 years)
One of the best experience during my time at ManTech is being promoted. In addition, I had some great supervisors and manger.
The least thing I liked is the salary increases diminished over the years. Corporate made the decision not to give large increases.
I applied online. I interviewed at ManTech (Arlington, VA) in July 2017.
Received an email from a recruiter about 3 weeks after applying online. Had a phone interview with two managers and then an in person interview shortly after. That part went great and I was really interested in the job. Mantech made an offer and then rescinded the same day because they did not want to negotiate on paid time off. They offered 14 days to start, which is far less than I receive now. Mantech also wanted me to commit to the job and not consider any other offers while they waited on their customer to process a background investigation, which would have taken months. I offered two months of commitment in exchange for more time off. My skill set is hard to find and with a high level security clearance I do receive multiple unsolicited offers every week. I'm not willing to sit around and wait for free on contingent offers when someone else might have a vacant funded position that can start within a normal two week time period.
Reasons for Declining
Mantech would not negotiate on time off and their offer wasn't the best.