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# Information System Security Officer

- **Company:** Mantech International Corporation
- **Location:** Fairmont, WV, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Cyber Security, Linux, Information Security Management, Office Suite, Security Software, Service Pack, Software Vulnerability Management
- **Published:** July 15, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9030186/information-system-security-officer

## About the Role

seeks a motivated, career and customer-oriented to join our team in ., * 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.

:

 * 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.

 * Must be a U.S citizen with a current/active Top Secret clearance.

 * Must be able to remain in a stationary position 50% and constantly operate a computer and other office productivity machinery, such as a calculator, copy machine and computer printer.

## Description

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.

 * 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.


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