Information System Security Officer (ISSO)

Peraton's Space & Intelligence Sector is looking for a mid-to-senior Information System Security Officer (ISSO) to join a diverse development team at our Herndon, VA, office. In this role, you will support IC systems and ensure they remain compliant, accredited, and operational within the customer's security requirements. This role is hands-on and embedded with the program, working directly with system owners, engineers, and the government to maintain security posture and keep mission systems running without interruption.

Responsibilities include:

Act as the security lead for assigned systems, serving as the direct interface with the Customer's security team(s) and program leadership.
• Maintain RMF and ICD 503 artifacts (SSP, SCTM, POA&M, IRP, etc.) and update them as the system evolves.
• Track vulnerabilities, coordinate patching and remediation with team, and ensure findings are closed on schedule.
• Manage continuous monitoring activities, including scanning, log review, security reporting, and compliance checks.
• Support accreditation and re-accreditation activities; prepare documentation and coordinate actions with team.
• Validate and oversee implementation of technical controls across system components (OS hardening, access controls, audit, configuration management).
• Provide security guidance on system changes, new integrations, or capability deployments.
• Work with users, administrators, and developers to ensure changes meet Customer security expectations before being implemented.
• Maintain situational awareness of existing and potential program risks and communicate impacts and required mitigating actions to leadership.

Required Qualifications:

• Active TS/SCI with Polygraph
• Bachelor's degree with 8+ years of relevant experience; Master's degree with 6+ years of relevant experience or 4+ years of relevant experience in lieu of a degree
• Experience supporting Assessment and Authorization (A&A) activities and the assosciated information assurance processes and documentation using RMF
• Experience supporting Intelligence Community or DoD mission systems
• RMF and Xacta experience
• Active DoD IAT Level I Certification
• Solid understanding of ICD 503, RMF, NIST SP 80053, DIA policies, and DoD cybersecurity requirements
• Strong writing and system security documentation skills
• Ability to communicate effectively with technical and nontechnical personnel
• Ability to take direction and work productively as a part of a team

Desired Qualifications:

• Background with cross-domain environments, classified networks, or cloud-based systems in the intelligence community
• Experience working with Splunk
• Experience supporting programs with tight operational timelines and rapid change cycles
• Experience working with AWS/Google cloud-hosted information systems or applications
• Experience working with Redhat or CentOS Linux operating systems
• Experience working in a DevSecOps environment

Peraton is a next-generation national security company that drives missions of consequence spanning the globe and extending to the farthest reaches of the galaxy. As the world's leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies. Peraton operates at the critical nexus between traditional and nontraditional threats across all domains: land, sea, space, air, and cyberspace. The company serves as a valued partner to essential government agencies and supports every branch of the U.S. armed forces. Each day, our employees do the can't be done by solving the most daunting challenges facing our customers. Visit peraton.com to learn how we're keeping people around the world safe and secure.