Information Systems Security Manager; ISSM

Position is contingent upon contract award and funding.

Entarian is seeking an experienced Information System Security Manager (ISSM) responsible for ensuring the cybersecurity posture, compliance, and accreditation of assigned information systems in accordance with applicable government and organizational requirements. The ISSM serves as the cybersecurity authority for assigned systems, providing strategic oversight of security engineering, risk management, and compliance activities throughout the system lifecycle. This role serves as the primary interface between technical teams, Information System Security Officers (ISSOs), system owners, engineering organizations, and the Authorizing Official (AO), ensuring cybersecurity requirements are effectively integrated into system design, development, implementation, and sustainment.

The ideal candidate will have demonstrated experience supporting large-scale defense or space environments involving space systems, ground infrastructure, mission operations, communications networks, cloud environments, or enterprise information technology capabilities.

• Exercise cybersecurity management authority over assigned information systems, ensuring security requirements are effectively implemented, maintained, and continuously monitored throughout the system lifecycle.
• Lead and manage the complete Risk Management Framework (RMF) lifecycle, including system categorization, security control selection and implementation, assessment, authorization, continuous monitoring, and ongoing risk management.
• Oversee and coordinate Interim Authorization to Test (IATT), Authorization to Operate (ATO), Authorization to Connect (ATC), and other authorization activities, ensuring timely development, submission, and maintenance of accreditation packages.
• Develop, maintain, and review System Security Plans (SSPs), Security Assessment Reports (SARs), Plans of Action and Milestones (POA&Ms), security policies, procedures, continuous monitoring documentation, and other RMF artifacts.
• Provide technical oversight, mentorship, and quality assurance for Information System Security Officers (ISSOs) supporting day‑to‑day cybersecurity operations.
• Serve as the primary cybersecurity liaison with the Authorizing Official (AO), Security Control Assessor (SCA), system owners, and government stakeholders, providing clear communication regarding system risk, compliance status, vulnerabilities, and authorization recommendations.
• Conduct and oversee cybersecurity risk assessments, vulnerability assessments, security impact analyses, remediation planning, and POA&M management to reduce organizational risk.
• Coordinate with system administrators, network engineers, software developers, systems engineers, cloud engineers, and mission partners to ensure security controls are effectively implemented and maintained.
• Review proposed system changes, architecture modifications, software releases, and technology insertions to evaluate cybersecurity impacts and maintain accreditation.
• Support cybersecurity engineering activities throughout system design, integration, testing, deployment, and sustainment.
• Prepare for and support cybersecurity audits, inspections, assessments, and compliance reviews conducted by government organizations and external assessors.
• Support incident response activities, cybersecurity investigations, and reporting requirements while ensuring appropriate documentation and corrective actions are completed.
• Develop and deliver cybersecurity awareness guidance and training for system users and technical personnel.
• Prepare executive‑level cybersecurity briefings, risk assessments, compliance reports, and technical recommendations supporting senior government decision‑makers.

Salary range: $ - $

• Active Top Secret security clearance with SCI eligibility.
• Bachelor's degree in Cybersecurity, Information Technology, Computer Science, Engineering, or a related technical discipline. Equivalent experience may be considered.
• Minimum fifteen (15) years of experience supporting cybersecurity, information assurance, or information system…