Senior Information System Security Officer

General information

Requisition # R66912 Locations USA-WV-Fairmont Posting Date 04/01/2026 Security Clearance Required Top Secret Remote Type Onsite Time Type Full time

Description & Requirements

Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we’ve been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now—unleash your potential with MANTECH!

MANTECH seeks a motivated, career and customer-oriented Senior Information System Security Officer (ISSO) to join our team in Fairmont, WV.

In this critical full-time role, you will be responsible for the overall cybersecurity posture of a large-scale government enterprise. As a senior member of the team, you will serve as the principal advisor on all matters related to information systems security and compliance, ensuring that a government cybersecurity center maintains authorization to operate (ATO) and maintains a strong security posture against evolving threats.

 Responsibilities include but are not limited to:

• Lead the preparation of documentation and coordination with government and technical staff for annual A&A’s performed by government assessors.
• Lead the development, maintenance, and oversight of system security plans (SSPs) and other RMF documentation required for system accreditation and authorization to operate (ATO).
• Conduct continuous monitoring and internal audits to ensure compliance with government security standards and policies.
• Advise and assist system administrators and engineers in the implementation and management of security controls.
• Oversee the vulnerability management program, ensuring security patches and vulnerability mitigations are implemented in a timely manner.
• Collaborate with the Cybersecurity Operations Center (CSOC) and other security teams during incident response efforts, providing expertise on system security and controls.
• Develop and update security policies, procedures, and training materials to promote a culture of security awareness.

 Minimum Qualifications:

• 5+ years of experience as an ISSO or in a similar cybersecurity role, with a strong background in government or DoD environments.
• In-depth knowledge of Windows and Linux operating systems, networking, and common cybersecurity tools.
• Continuous monitoring and internal auditing experience.

Preferred Qualifications:

• Professional certifications such as CISSP, CISM, or Security+ are preferred.
• Extensive experience with the NIST Risk Management Framework (RMF) and other security control standards preferred.

Clearance Requirements:

• Must have a current/active Top Secret clearance.

Physical R