Information Systems Security Officer

General information Requisition # R67220 Locations USA-VA-Stafford Posting Date 04/20/2026 Security Clearance Required Secret Remote Type Onsite Time Type Full time Description & Requirements Shape the future of defense with MANTECH! Join a team dedicated to safeguarding our nation through advanced tech and innovative solutions. Since 1968, we've been a trusted partner to the Department of Defense, delivering cutting-edge projects that make a real impact. Dive into exciting opportunities in Cybersecurity, IT, Data Analytics and more. Propel your career forward and be part of something extraordinary. Your journey starts now—protect and innovate with MANTECH! MANTECH seeks a motivated, career and customer-oriented

INFORMATION SYSTEMS SECURITY OFFICER

to join our team in

STAFFORD, VA.

Responsibilities include but are not limited to: Assist the Department of War and USMC with the development and execution of assessment and authorization (A&A) efforts. Prepare, review, and update authorization packages (IATT/ATO) to maintain the security posture of mission-critical systems. Manage and track Plans of Action and Milestones (POA&Ms) within ISSO responsibility to ensure timely remediation of findings from audits. Conduct continuous monitoring activities for authorization boundaries and notify the ISSM of changes affecting the system's authorization. Coordinate hardware, software, and firmware modifications with the ISSM and AO/DAO prior to implementation. Monitor system recovery processes to ensure security features are properly restored and audit records are accurately collected and reviewed.

Minimum Qualifications:

Bachelor's degree in Cybersecurity, Information Assurance, or a related field with 5+ years of progressively responsible experience in information systems security. A total of 10 years' experience without a degree. Proven experience accrediting IT systems against U.S. Government standards such as

NIST SP 800-53, CNSSI

1253, and DISA STIGs. Hands-on experience supporting system accreditation and authorization tasks using eMASS. Possess active foundational cybersecurity certifications such as CompTIA Security+ or CySA+. Demonstrated ability to perform ISSO duties including the execution of cybersecurity self-inspections and the review of system assessment plans.

Preferred Qualifications:

Possess advanced technical certifications such as CompTIA PenTest+ or Cisco Certified Network Associate (CCNA). Experience managing secure network infrastructures and enterprise firewall policies in DoD environments. Self-starter with excellent people skills who can collaborate across teams to drive organization-wide security improvements.

Clearance Requirements:

Must have a current active SECRET security clearance with the ability to obtain and maintain a TS/SCI with SAP clearance eligibility.

Physical Requirements:

Must be able and willing to perform occasional manual labor and warehouse duties, with the ability to lift up to 50 pounds. Must be able to remain in a stationary position 50% of the time. MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation. If you need a reasonable accommodation to apply for a position with MANTECH, please email us at careers@mantech.com and provide your name and contact information.