Information Systems Security Officer

Great Hill Solutions, LLC seeks a highly motivated Information Systems Security Officer (ISSO) to join our Orlando-based technical team supporting the National Cyber Range Complex (NCRC). The NCRC plays a critical role in enhancing the resilience of DoD systems and the effectiveness of U.S. cyber operations by delivering full-spectrum test and evaluation, workforce training, and mission rehearsal events. As the NCRC continues to evolve as a best-of-breed cyber range, the ISSO will contribute directly to ensuring secure facilities, tools, and expertise for some of the most demanding test, training, and mission rehearsal requirements in the Department of Defense. As a key member of the cybersecurity team, the ISSO will act as a security liaison across multiple domains-including physical, personnel, information, cyber, operations, Anti-Terrorism/Force Protection, law enforcement, communications, and technical security-while working closely with the Information Systems Security Manager (ISSM) to ensure compliance, readiness, and secure mission execution.

Responsibilities include, but are not limited to :

• Provide direct support to the ISSM on activities such as Assessment & Authorization (A&A), execution of Continuous Monitoring Plans, and facilitation of Security Controls Assessments.
• Administer and monitor Risk Management Framework (RMF) steps and activities throughout the system lifecycle to maintain an appropriate security posture.
• Implement cybersecurity programs, policies, and procedures for assigned systems.
• Maintain working knowledge of current and upcoming events, system functions, policies, safeguards, and security measures.
• Serve as a subject matter expert (SME) in DoD, DIA, and RMF core concepts and processes.
• Coordinate with applicable stakeholders across the enterprise to ensure security compliance and readiness.
• Maintain Authorization to Operate (ATO) packages for assigned systems within the designated A&A System of Record (e.g., eMASS, XACTA 360, Keystone).
• Review and analyze audit logs (e.g., Splunk, Windows EVTX, Linux syslogs) to detect potential anomalies or threats.
• Perform validation checks to ensure CM-approved software and antivirus definitions are installed on assigned systems.
• Conduct compliance/vulnerability scans and manual checks to identify and mitigate risks.
• Execute ISSO-specific tasks as outlined in program security plans.
• Implement account management processes, issuing credentials, and enforcing least-privilege principles.
• Deliver cybersecurity education, training, and awareness to system users as required by the ISSM

• Active Top Secret clearance with SCI eligibility.
• Bachelor’s degree in Cybersecurity, Information Systems, or related discipline, and/or 8+ years of relevant experience (additional experience may substitute for degree).
• Minimum of 5 years of extensive experience in cybersecurity, information assurance, and RMF processes.
• DoD 8570.0 and DoDD 8140.01 IAT Level II certification or higher.
• At least 2 years of experience conducting IT application, system, or network reviews and providing DoD cybersecurity policy and technical guidance.

Desired Skills:

• Certification aligned to DoDM 8140.03 / DoD Cyberspace Workforce Framework.
• Familiarity or background with some of the following technologies:
• Zero-trust requirements / concepts.
• VMWare (vSphere, vCenter, NSX, ESXi)
• RHEL (Ansible, Kubernetes, StackRox, OpenShift)
• AWS / Azure cloud technologies and containerization
• F5 BIG-IP, Cisco networking, and distributed technologies
• STIG and IAVA implementation
• NetApp storage technologies
• Dell Blade Servers

At Seneca, our team of talented individuals is what makes us successful. To support our team, we provide a balanced mix of benefits and programs. Your total rewards package includes competitive pay, benefits, and perks, flexible work-life balance, professional development opportunities, and performance and recognition programs. We offer a comprehensive benefits package that includes medical, dental, vision, life, and disability, voluntary benefit programs (critical illness, hospital, and accident), health savings and flexible spending accounts, and retirement 401K plan. One of our fundamental principles at Seneca Holdings is to offer competitive health and welfare benefits to our team members, providing coverage and care for you and your family. Full-time employees working at least 30 hours a week on a regular basis are eligible to participate in our benefits and paid leave programs. We pride ourselves on our collaborative work environment and culture, which embraces our mission of

Great Hill Solutions, LLC is part of the Seneca Nation Group (SNG) portfolio of companies. SNG is Seneca Holdings’ federal government contracting business that meets the mission-critical needs of federal civilian, defense, and intelligence community customers. Our portfolio comprises multiple subsidiaries that participate in the Small Business Administration 8(a) program. To learn more about SNG, visit the website and follow us on LinkedIn .