ISSO — Mission Systems Security Lead (TS/SCI)

Peraton; Herndon (VA); Hybrid; USD 135,000 - 216,000; Full time

Job summary

Peraton's Space & Intelligence Sector seeks a mid-to-senior Information System Security Officer (ISSO) in Herndon, VA to lead security for IC systems, ensuring RMF compliance and continuous operation with program staff.

You will work hands-on with system owners, engineers, and government representatives to maintain security posture, perform accreditation tasks, and implement ICD 503 controls across OS, access, and logs. Strong collaboration and clear documentation are essential.

Qualifications

• Active TS/SCI with Polygraph.
• Bachelor's degree with 8+ years of relevant experience; Master's with 6+ years or 4+ years in lieu of a degree.
• Experience supporting Assessment and Authorization (A&A) activities and 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 800-53, DIA policies, and DoD cybersecurity requirements.
• Strong writing and system security documentation skills.
• Ability to communicate effectively with technical and non-technical personnel.

Responsibilities

• Act as the security lead for assigned systems, interfacing with Customer security teams and program leadership.
• Maintain RMF artifacts (SSP, SCTM, POA&M, IRP) and update them as the system evolves.
• Track vulnerabilities and coordinate patching to close findings on schedule.
• Manage continuous monitoring activities including scanning, log review, security reporting, and compliance checks.
• Support accreditation and re-accreditation activities with the team.
• Validate and oversee implementation of technical controls across system components (OS hardening, access control, auditing, configuration management).
• Provide security guidance on system changes, new integrations, or capability deployments.
• Work with users, admins, and developers to ensure changes meet Customer security expectations.
• Maintain situational awareness of program risks and communicate mitigations to leadership.

Skills

TS/SCI with Polygraph

A&A experience

Security documentation

Effective communication

Education

Bachelor's degree in related field

Master's degree preferred

Tools

Xacta

Splunk

AWS

Google Cloud

Linux (RHEL/CentOS)

Job description

Peraton's Space & Intelligence Sector seeks a mid-to-senior Information System Security Officer (ISSO) in Herndon, VA to lead security for IC systems, ensuring RMF compliance and continuous operation with program staff.

You will work hands-on with system owners, engineers, and government representatives to maintain security posture, perform accreditation tasks, and implement ICD 503 controls across OS, access, and logs. Strong collaboration and clear documentation are essential.