Information Systems Security Officer; ISSO

Posted October 02, 2026

Position: ISSO

Clearance: TS/SIC

Salary Range: $120,000 - $135,000

Job Description:

The Mission Essential Group, LLC (MEG) is a premier service provider of information management solutions for complex, mission-critical needs. MEG has earned a reputation as an innovator and pioneer. Headquartered in Fairfax, VA, MEG employs professionals in offices located throughout the United States and around the world. MEG offers a competitive benefits package including a competitive salary; medical, dental, vision, life and disability insurance;

paid time off; and retirement benefits.

MEG is a leading provider of Information Management system engineering, software development, information assurance, system sustainment and is the primary provider of technical support for the Integrated Broadcast Service (IBS) Enterprise. IBS is the worldwide Department of Defense (DoD) joint program for transporting intelligence, surveillance & reconnaissance (ISR) and targeting data to all levels of tactical and strategic operational users.

IBS provides global, 24/7, dissemination of time sensitive Indications & Warning and Force Protection data to Joint Warfighters and Collaborating Nation partners conducting military operations around the world. MEG serves a vital role in supporting the IBS Enterprise, providing continuity in skills crucial to support military operations. MEG integrates the talents and skills of team members to form an IBS Enterprise Support Services Team to provide world-class IBS customer support.

MEG provides innovative software tools, technical services, and rapid development of solutions to support end user requirements. As such our systems and products require are high level of quality and configuration management to ensure they meet and/or exceed customer expectations.

The ISSO serves as a key contributor to the organization's cybersecurity program, supporting the implementation of security controls, Risk Management Framework (RMF) activities, continuous monitoring, and Assessment and Authorization (A&A) efforts. This hands-on position requires a strong understanding of information assurance principles, cybersecurity best practices, and federal and DoD regulatory requirements to ensure the confidentiality, integrity, and availability of mission-critical information systems.

The position is located at the company's headquarters in Fairfax, Virginia.

Duties and Responsibilities:

• Support Assessment and Authorization (A&A) activities, including RMF package development, security control implementation, assessment, validation, continuous monitoring, vulnerability management, POA&M tracking, and Authority to Operate (ATO) processes using eMASS and/or Xacta.
• Verify that system changes, upgrades, and modifications that may impact the security posture or authorization status of information systems are identified, documented, and communicated to appropriate stakeholders.
• Serve as the primary liaison between system owners, Information System Security Managers (ISSMs), engineers, assessors, and other cybersecurity stakeholders.
• Ensure the day-to-day implementation, oversight, continuous monitoring, and security compliance of multiple information systems.
• Lead and facilitate meetings with technical and functional subject matter experts to identify, document, validate, and track cybersecurity and compliance requirements.
• Conduct vulnerability assessments and security scans using tools such as Nessus, SCAP Compliance Checker, and other approved scanning solutions.
• Ensure appropriate protective and corrective actions are implemented and tracked when security incidents, vulnerabilities, or compliance deficiencies are identified.
• Perform risk assessments and assist with the identification, analysis, and mitigation of cybersecurity risks.
• Support the installation, configuration, and maintenance of hardware and software within secure computing environments.
• Apply security patches, updates, and configuration changes to maintain system compliance and reduce cybersecurity risk.
• Conduct cybersecurity investigations and develop reports, findings, recommendations, and corrective action plans as required.
• Develop and maintain Security Control Traceability Matrices (SCTMs) to map security requirements to DoD and NIST security controls.
• Research emerging technologies, cybersecurity threats, vulnerabilities, and industry best practices to support continuous improvement of…