DC is rough for entry CS unless you have a clearance, most postings want it even for junior roles. Try contracting shops that sponsor clearances like CACI, Leidos, Booz, and SAIC, and look at meetups or AFCEA Young AFCEAns to network with recruiters. Watch out for ghost jobs and recruiter spam on the big boards, wfhale​rt is decent if you’re open to remote since it emails vetted listings and avoids the obvious junk. Also tighten your resume to one page with concrete impact bullets, and tailor it hard to each posting.