Pros
Large company so there may be good teams to be found. I can only speak for my experience and other teams I interacted with. Efforts have been made to be perceived as a "tech company who happens to do government contracts" though mostly insincere. It's definitely still very much a "government contractor who happens to do software." Low technical bar for hiring so it could be a good stepping stone for early career folks or "lifer" types who just want to do the minimum and grind away until retirement. Looks ok on the resume in the DC area. You will relate to every Dilbert cartoon you come across.
Cons
Low technical bar, zero focus on culture -- Mostly mediocre unmotivated coworkers. Culture of doing the bare minimum to "meet requirements." -- Mediocre results for clients. Most teams are best described as boring people doing boring work in a boring place. Strictly hierarchical decision making process where technology choices are made by non-technical upper management who don't understand the implications of their decisions. Poor software development practices. Upper management talks about "agile" and "devops" but these are not done in practice. Arbitrary deadlines. Management believes stressed out employees is the ultimate sign of productivity. Management is considered a quasi-retired position which serves as a reward for loyalty/tenure. Most middle managers therefore lack management/leadership skills and simply serve as yes-men for their bosses. "but we've always done it that way" "it's already been decided" are unofficial company mottos. Frustrating environment if you take pride in your work/craft due to above issues. You will relate to every Dilbert cartoon you come across. Poor tech resources. Tiny old monitors, mediocre computers, IT resources such as VPNs are slow and unreliable.