Information Systems Security Officer (ISSO) - Senior

Job Description

Position Summary
ECS is seeking an Information Systems Security Officer (ISSO) - Senior to support the Army National Guard (ARNG) Enterprise Network Operations and Cybersecurity Support (ENOCS) program. In this role, the ISSO supports Task 3 - Cybersecurity Operations Support by implementing and sustaining system-level security controls for assigned information systems and enclaves, maintaining required security documentation and continuous monitoring evidence, managing POA&Ms, and validating remediation actions to preserve an approved security posture throughout the system lifecycle. The ISSO works closely with system owners, engineers, SOC personnel, and Authorizing Officials to support assessments, inspections, authorization activities, and ongoing compliance across the ENOCS cybersecurity operations mission.

This position directly supports ARNG's mission to deliver secure DoDIN services and Defensive Cyberspace Operations - Internal Defensive Measures (DCO-IDM) for more than 120,000 users and approximately 141,000 endpoints across roughly 2,800 sites in 54 states and territories. The ISSO helps protect both classified and unclassified environments across the DoDIN-A(NG) area of responsibility, supporting Title 10 and Title 32 missions, mobilization readiness, domestic emergency response, and classified SIPRNet operations. The role operates within an enterprise cybersecurity environment that includes RMF and eMASS processes, continuous monitoring, USIEM-enabled visibility, and coordination with the NETCOM Global Cyber Center and DISA DCDC to maintain audit readiness, compliance, and resilient cyber defense.

Please Note: This position is contingent upon contract award.
Responsibilities

• Implement and sustain security controls for assigned information systems and enclaves in accordance with DoD and ARNG cybersecurity policy and RMF requirements.
• Develop, maintain, and update system security documentation, including System Security Plans (SSPs), control implementation artifacts, continuous monitoring evidence, and related authorization package materials.
• Track, manage, and update Plans of Action and Milestones (POA&Ms), validate remediation actions, and document control effectiveness to support ongoing authorization and compliance.
• Coordinate with system owners, engineers, SOC personnel, and Authorizing Officials to support security assessments, inspections, reviews, and authorization activities across the system lifecycle.
• Maintain eMASS records with required DoD artifacts, security plans, self-assessments, and supporting evidence to enable continuous assessment and audit readiness.
• Support continuous monitoring activities by collecting, organizing, and validating evidence aligned to approved risk thresholds and RMF requirements for assigned systems.
• Partner with cybersecurity operations teams supporting USIEM-enabled monitoring and incident workflows to ensure security findings, vulnerabilities, and control deficiencies are accurately reflected in system compliance documentation.
• Support security posture maintenance for systems operating in classified and unclassified environments, including ARNG enclaves supporting SIPRNet operations and broader DoDIN-A(NG) mission requirements.
• Coordinate with cybersecurity stakeholders and external organizations, including the NETCOM Global Cyber Center and DISA DCDC, as required to support compliance, reporting, and defensive cyber operations across the ARNG enterprise.

Required Skills

Required Qualifications
U.S. Citizenship is required

Security Clearance: Secret Eligible

Required Certifications: DCWF Work Role 722-Information Systems Security Manager - Intermediate proficiency; must hold ONE OR MORE of the following: GMON, SecurityX / CASP+, CCISO, CCSP, CGRC/CAP, CISSO, Cloud+, GCSA, GSEC, Security+, SSCP

Experience: 7+ years of experience in cybersecurity

Education: Bachelors degree or higher in Computer Science, Cybersecurity, Data Science, Information Systems, Information Technology, or Software Engineering

• Experience implementing and sustaining security controls for information systems in accordance with RMF requirements.
• Experience developing and maintaining SSPs, control implementation documentation, continuous monitoring evidence, and related security artifacts.
• Experience managing POA&Ms and verifying remediation activities to support compliant system operation and authorization readiness.
• Experience supporting eMASS package maintenance, self-assessments, and ongoing authorization activities.
• Experience coordinating with system owners, engineers, SOC personnel, and assessment stakeholders to resolve compliance findings and maintain audit readiness.
• Experience supporting security compliance for enterprise environments spanning multiple sites, enclaves, or geographically distributed operations.
• Ability to document security status clearly and maintain accurate records for inspections, reviews, and continuous monitoring activities.

Desired Skills

Desired Qualifications
Security Clearance: Active Secret (preferred)

• Experience supporting ARNG, Army, or other DoD cybersecurity operations within classified and unclassified network environments.
• Experience supporting systems within large-scale enterprise environments serving distributed users and endpoints across multiple states, territories, or regions.
• Familiarity with USIEM-supported monitoring environments and the integration of operational security findings into RMF and compliance workflows.
• Experience coordinating cybersecurity compliance or incident-related actions with organizations such as NETCOM, DISA, RCCs, or other DoD cyber mission partners.
• Experience supporting SIPRNet-connected or other classified enclave systems subject to continuous monitoring, inspection, and authorization requirements.

ECS Federal LLC is an equal opportunity employer and does not discriminate or allow discrimination on the basis any characteristic protected by law. All qualified applicants will receive consideration for employment without regard to disability, status as a protected veteran or any other status protected by applicable federal, state, or local jurisdiction law.

Everforth ECS is the federal segment of Everforth , a $4B global organization with over 10,000 employees. Our nearly 3,500 professionals deliver advanced technology solutions in data and AI, cybersecurity, and enterprise transformation, serving defense, intelligence, and federal civilian agencies.

Our work powers mission-critical outcomes, strengthens technology partnerships, and creates meaningful opportunities for our people. We are defined by a commitment to excellence in delivery, a culture of innovation, and an environment where talent can thrive and grow.

We value:

• Attracting and developing top talent and high-performing teams
• Fostering a culture that is engaging, accountable, and mission-driven