Senior Information System Security Officer
Washington, DCFull-time$112k–$179kPosted Aug 6, 2026
Responsibilities
Peraton is seeking a Senior ISSO to support our customer onsite in Washington D.C.
Key responsibilities include:
- 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
Required 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&Ms, 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.