Information Systems Security Manager, Senior

Nexagen Networks • Fort Detrick, MD

1d • $120,000 - $170,000

About The Position

As the Information Systems Security Manager (ISSM) , you will join a high-performing team dedicated to excellence, innovation, and mission-critical support. At Nexagen, you will play a vital role in protecting sensitive systems and ensuring cybersecurity compliance across DoD environments. With outstanding benefits and strong growth opportunities, you will thrive in a collaborative and forward-thinking environment while contributing directly to national security missions. Leverage over two decades of industry expertise to drive secure, compliant, and resilient solutions across diverse government sectors. Nexagen Networks is a trusted partner to the Department of Defense (DoD) and other federal agencies, including the Army, Air Force, Marine Corps, Navy, and DHS. With more than 20 years of industry expertise, we deliver exceptional lifecycle professional services spanning Research and Development, Cloud Engineering, Digital Modernization, Systems and Software Engineering, DevSecOps, ITSM, Cybersecurity, Satellite Communication (SATCOM), RMF-FedRAMP, Logistics, Training, Exercises, COMSEC, and IT/Networking. Nexagen Networks is seeking a skilled Information Systems Security Manager (ISSM) to plan, direct, and oversee cybersecurity activities supporting mission-critical DoD systems. This role is responsible for managing cybersecurity risk, supporting system authorization and accreditation efforts, and ensuring compliance with DoD security policies and standards. The ISSM will work closely with engineering, program management, and government stakeholders to maintain the confidentiality, integrity, and availability of information systems operating in regulated environments. The ideal candidate will possess strong cybersecurity leadership experience, a deep understanding of security controls and assessment processes, and the ability to operate effectively across complex enterprise environments.

Requirements

• Current and active DoD Top Secret clearance
• 4–6 years of professional cybersecurity experience
• Strong knowledge of hardware and software installation, testing, and operations
• Experience with Active Directory, Group Policy, and Domain Name System (DNS)
• Hands-on experience with Assured Compliance Assessment Solution (ACAS)
• Understanding of Host Based Security System (HBSS)
• Knowledge of IP networking, switches, and network security fundamentals
• Experience implementing and interpreting Security Technical Implementation Guides (STIGs)
• Excellent written and verbal communication skills
• Strong analytical and problem-solving abilities
• Ability to reprioritize tasks quickly and clearly communicate the impact of change
• Quick learner who is creative, resourceful, and capable of working independently and as part of a team

Nice To Haves

• Bachelor’s degree in a related field
• Prior DoD experience or military training
• DISA certification for Assured Compliance Assessment Solution (ACAS)

Responsibilities

• Perform vulnerability and risk assessment analysis to support Wideband Control software, cybersecurity audits, system accreditation, and program protection activities
• Conduct technical evaluations of information system designs with a focus on security controls and accreditation requirements
• Monitor, evaluate, and maintain systems and procedures to safeguard information systems, networks, and databases
• Interpret, assess, and apply Security Technical Implementation Guides (STIGs)
• Perform duties as an Assured Compliance Assessment Solution (ACAS) administrator
• Review subsystem cybersecurity documentation to ensure compliance and accuracy
• Support ongoing RMF activities and continuous monitoring efforts

Benefits

• At Nexagen, we believe in taking care of our team from day one. We offer comprehensive benefits including health, dental, and vision insurance, generous paid time off, a matching 401(k), and a variety of support programs.
• Professional development opportunities and additional perks are provided to ensure you thrive both personally and professionally.
• Benefits begin on your first day of employment.
• Nexagen supports continuous learning through training and educational reimbursement, celebrates achievements, and fosters a collaborative environment where your contributions directly impact customer success and mission outcomes.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level