Computer Security Systems Specialist
Company: By Light Professional IT Services
Location: Fort Belvoir
Posted on: January 27, 2026
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Job Description:
By Light Professional IT Services LLC readies warfighters and
federal agencies with technology and systems engineered to connect,
protect, and prepare individuals and teams for whatever comes next.
Headquartered in McLean, VA, By Light supports defense, civilian,
and commercial IT customers worldwide. Position Overview The
program delivers end-to-end EFIS&T services—including survey
and design through installation, security, and testing. This work
spans NIPR and SIPR networks, Wi-Fi, VoIP, ISP/OSP infrastructure,
and voice modernization across all CONUS Army installations. We’re
looking for a Computer Security Systems Specialist to design,
document, and implement cybersecurity controls for Army enterprise
networks. You’ll ensure systems are engineered and configured to
meet DoD, Army, and DISA security requirements, and you’ll support
fielded systems through assessment, approval, and operational
deployment. You’ll work closely with engineering teams, program
leadership, and cybersecurity authorities to deliver secure,
compliant systems ready for operational use. Responsibilities
Design and plan security measures to protect systems and networks
in accordance with DISA STIGs/SRGs, IAVAs, and DoDI 8100.04
Research, maintain, and manage cybersecurity artifacts, including:
STIG checklists Approved operating system versions POA&Ms
Hardware and software inventories Test, training, implementation,
and transition/migration plans Installation team checklists Align
security controls with NIST 800-53 and CIS Benchmarks Provide
required cybersecurity artifacts to the GENM-A ISSM for review and
approval Develop and deliver system and network diagrams (topology,
physical, logical, data flow) in support of CDRL requirements
Support vulnerability assessments, penetration testing, and
implementation of IDS/IPS solutions Configure and validate security
controls, including firewall rules and access control lists
Required Experience/Qualifications Bachelor’s degree in
Cybersecurity, Information Assurance, or a related IT field Four
(4) additional years of relevant experience may be substituted in
lieu of a degree 10 years of cybersecurity or information assurance
experience, including 2 years leading cyber or IA personnel or
teams Meets DoD 8570 IAT Level III certification requirements
Preferred Experience/Qualifications Certifications and/or
experience in Zero Trust architectures Special
Requirements/Security Clearance Active TS/SCI at the time of
application Travel up to 25%, as required Physical Demands Ability
to lift up to 30 lbs By Light recognizes that our strength is our
people. We support every employee as an individual to build strong
teams across the enterprise. Our benefit package includes: Medical,
Dental & Vision Coverage Wellness Program 401(k) Matching
Disability (Short Term & Long Term) Employee Assistance Program
Life Insurance Education & Training Generous Leave Policy (11
Federal Holidays, PTO, and Military Leave)
Keywords: By Light Professional IT Services, Annandale , Computer Security Systems Specialist, IT / Software / Systems , Fort Belvoir, Virginia
