Senior ISSO: Lead RMF/ATO for Complex Systems

Peraton; United States; On-site; USD 135,000 - 216,000; Full time

Job summary

Peraton is seeking a Senior ISSO to support our customer onsite in Annapolis Junction, MD. The role leads RMF activities, mentors junior ISSOs, and coordinates ATO/reauthorization for complex systems.

You will work across development, operations, and modernization, driving security engineering outcomes, producing SSPs and POA&Ms, and briefing senior leadership on risk trends and authorization readiness. Active TS/SCI clearance required.

Qualifications

• Requires active Top Secret clearance with SCI eligibility.
• BS/BA with 12+ years or MS/MA with 10+ years (or 4 additional years in lieu).
• 8+ years of information security/compliance experience supporting DoD/IC or government systems.
• Proven leadership coordinating across security, engineering, and customer stakeholders.
• Experience writing risk decisions and RMF deliverables that withstand assessor/AO review.
• Deep understanding of continuous monitoring at scale and RMF tasks.

Responsibilities

• Lead or co-lead ATO/reauthorization efforts for complex boundary systems.
• Mentor junior ISSOs and shape security operations playbooks.
• Perform risk analysis and author formal recommendations to leadership.
• Drive security engineering outcomes by partnering with internal teams on scalable compliance patterns.
• Brief senior internal and customer stakeholders on security posture and remediation progress.
• Act as Senior ISSO supporting the system security lifecycle across development, operations, and modernization.
• Execute RMF activities: control implementation oversight, evidence, POA&M, and continuous monitoring.
• Maintain security artifacts (SSP, control narratives, diagrams, etc.).
• Operate continuous monitoring: vulnerability management, config compliance, patching, scan triage, and remediation verification.
• Review and approve security changes through change control and validate configurations after upgrades.
• Support incident response and post-incident lessons learned.
• Ensure least privilege governance and periodic access reviews.

Skills

Leadership

Mentorship

Risk communication

RMF knowledge

Education

BS/BA in a relevant field

MS/MA in a related field

Tools

Splunk

ACAS

Nessus

Job description

Peraton is seeking a Senior ISSO to support our customer onsite in Annapolis Junction, MD. The role leads RMF activities, mentors junior ISSOs, and coordinates ATO/reauthorization for complex systems.

You will work across development, operations, and modernization, driving security engineering outcomes, producing SSPs and POA&Ms, and briefing senior leadership on risk trends and authorization readiness. Active TS/SCI clearance required.