Senior Information System Security Officer

Peraton Corporation; Washington (District of Columbia); On-site; USD 112,000 - 179,000; Full time

Job summary

Peraton is seeking a Senior Information System Security Officer (ISSO) to lead RMF/ATO activities for complex boundary systems and mentor junior staff. You will partner with internal teams to implement scalable compliance patterns and brief leadership on risk trends and readiness.

Responsibilities include writing risk decisions, maintaining SSPs and artifacts, and overseeing continuous monitoring, vulnerability management, and configuration compliance. Top Secret/SCI eligibility is required.

Qualifications

• Requires active Top Secret clearance with SCI eligibility.
• 12+ years with a BS/BA or 10+ years with an MS/MA; 4 years may substitute for a BS.
• 8+ years in information security/compliance for DoD/IC or government systems with RMF deliverables.
• Ability to write risk decisions and packages for assessor/AO review.
• Strong knowledge of NIST SP 800-53 and mapping to implementations.
• Experience with vulnerability and configuration compliance workflows.

Responsibilities

• Lead or co-lead RMF/ATO efforts for complex boundary systems.
• Mentor junior ISSOs and shape security playbooks.
• Perform risk analysis and author formal leadership recommendations.
• Drive security engineering outcomes with internal teams on compliant patterns.
• Brief senior stakeholders on security posture, risks, and readiness.
• Support the system security lifecycle across development, operations, and modernization.
• Execute and maintain RMF activities: evidence collection, POA&M management, continuous monitoring.
• Maintain SSP, control narratives, diagrams, and contingency artifacts.
• Operate continuous monitoring: vulnerability management, patching, and risk acceptance.
• Review changes for security impact and validate configurations after upgrades.
• Support incident response and post-incident lessons learned.
• Ensure least privilege governance: account management and access reviews.
• Translate security requirements into actionable guidance for engineering.

Skills

RMF knowledge

Risk analysis

Security leadership

Mentorship

Communication of risk

ATO/SSP coordination

Education

BS/BA in related field

MS/MA in related field

Tools

Splunk

ACAS

Nessus

Job description

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, systemic risk trends, remediation burn-down, and authorization readiness
• Act as the Senior ISSO supporting the system security lifecycle across development, operations, and modernization
• Execute and maintain RMF activities (e.g., control implementation oversight, evidence collection, assessment support, POA&M management, continuous monitoring)
• Maintain security authorization artifacts (e.g., SSP, control narratives, diagrams, inheritance/leverage controls, CM plan, incident handling plan, contingency artifacts, user/admin procedures)
• Operate continuous monitoring: vulnerability management, config compliance, patching coordination, scan result triage, risk acceptance, and remediation verification
• Review and approve security-relevant changes through configuration/change control and validate security configurations after major upgrades
• Support incident response and reporting: participate in investigations, coordinate containment actions, preserve evidence, and contribute to post-incident lessons learned
• Ensure least privilege/access governance: account management oversight, privileged access workflows, periodic access reviews, and audit compliance requirements
• Translate security requirements into implementation guidance that engineering teams can operationalize (clear, testable, and automatable where possible)

Qualifications

• Requires active Top Secret clearance with SCI eligibility
• Min 12 years with BS/BA, Min 10 years with MS/MA; may consider 4 additional years experience in lieu of BS degree.
• 8+ years of experience in information security/compliance supporting DOD/IC or government systems, including ownership of major RMF deliverables and ATO events for complex systems
• Demonstrated leadership experience coordinating across security, engineering, and customer stakeholders
• Ability to provide mentorship and direction to team members
• Proven ability to write risk decisions and packages that stand up to assessor/AO scrutiny
• Deep understanding of continuous monitoring at scale (recurring evidence, metrics, audit readiness, remediation governance)
• Hands-on experience executing RMF tasks and maintaining authorization artifacts (SSP, POA&M(s), continuous monitoring evidence)
• Strong working knowledge of NIST SP 800-53 controls and how they map to technical implementations and procedures
• Experience with vulnerability and configuration compliance workflows
• Ability to communicate risk clearly to both technical engineers and non-technical leadership
• One or more active/current certifications such as: CISSP, CISM, SecurityX, Security+, and etc.

Preferred Qualifications

• Experience with SAP assessments and authorizations
• Experience securing or assessing different platforms (applications, databases, operating systems, hardware, and etc )
• Experience with SCRUM methodologies
• Experience with Splunk and/or other auditing compliance tools.
• Experience with ACAS, Nessus, and/or other vulnerability scanners
• Experience with data protection requirements relevant to sensitive environments

Peraton Overview

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.

Target Salary Range

$112,000 - $179,000. This represents the typical salary range for this position. Salary is determined by various factors, including but not limited to, the scope and responsibilities of the position, the individual’s experience, education, knowledge, skills, and competencies, as well as geographic location and business and contract considerations. Depending on the position, employees may be eligible for overtime, shift differential, and a discretionary bonus in addition to base pay.

EEO

Equal opportunity employer, including disability and protected veterans, or other characteristics protected by law.

Job Summary

Requisition ID: 2026-169350 Position Category: Cyber Security Clearance: Top Secret/SCI