Senior ISSO: Information Security Officer (Top Secret/SCI)

Peraton; Corridor North (MD); On-site; USD 104,000 - 166,000; Full time

Job summary

Peraton is seeking an Information System Security Officer (ISSO) to support our customer onsite in Annapolis Junction, MD. This role requires TS/SCI eligibility and hands-on RMF, ATO, and continuous monitoring experience.

You will translate security requirements for engineering teams, maintain artifacts, and coordinate with ISSMs, PMs, and ISO. The position offers growth in certifications and a mission-focused environment.

Qualifications

• Active Top Secret clearance with SCI eligibility.
• 5 years with BS/BA; 3 years with MS/MA; 4 additional years of experience may be considered in lieu of degree.
• Security+ or equivalent certification (DoD 8570 IAM Level II).
• Experience with SAP assessments and authorizations.
• 3+ years experience with Authority to Operate (ATO) process, continuous monitoring, POA&Ms, Security Authorizations (SA), NIST 800-37, NIST 800-53 Rev4/ Rev5.
• Experience with SCAP, STIGs, and other compliance tools.
• Proven written and verbal communication skills, and the ability to work well with team members.

Responsibilities

• Assist the Information System Security Manager (ISSM) with information assurance efforts and systems across numerous environments.
• Perform ISSO roles and responsibilities as prescribed by the JSIG and other applicable regulations.
• Execute and maintain RMF activities (control implementation oversight, evidence collection, assessment support, POA&M management, continuous monitoring).
• Maintain security authorization artifacts (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).

Skills

Written and verbal communication

SCRUM methodologies

Experience with auditing tools

Team collaboration

Education

BS/BA

MS/MA

Tools

Splunk

ACAS

Nessus

Job description

Peraton is seeking an Information System Security Officer (ISSO) to support our customer onsite in Annapolis Junction, MD. This role requires TS/SCI eligibility and hands-on RMF, ATO, and continuous monitoring experience.

You will translate security requirements for engineering teams, maintain artifacts, and coordinate with ISSMs, PMs, and ISO. The position offers growth in certifications and a mission-focused environment.