Information System Security Officer (ISSO), Senior

Peraton • Herndon, VA

1d • $104,000 - $166,000

About The Position

We are seeking a highly skilled and innovative Information System Security Officer (ISSO) to join our team in the greater DMV area, supporting the Army National Guard. 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.

Requirements

• Minimum of 8 years with BS/BA; Minimum of 6 years with MS/MA; Minimum of 3 years with PhD
• Clearance: Active TS/SCI clearance.
• Candidate must meet ONE of the following: Master’s degree or Ph.D. in Computer Science, Cybersecurity, Data Science, Information Systems, Information Technology, Software Engineering, or a related field; OR Relevant DoD/military training (examples: 4C‑FA26A; M09CHN1; A‑531‑0009; Information Systems Security Manager (Advanced) Playlist); OR Relevant professional certification or equivalent experience (examples: CISM, CISSP, CISSP‑ISSMP, FITSP‑M, GCIA, GCIH, GICSP, GSLC).
• Cybersecurity experience with at least 3 years performing ISSO or equivalent system security roles in DoD or large enterprise environments.
• Deep working knowledge of RMF/ATO processes, NIST SP 800‑53 controls, DISA STIGs/SRGs, vulnerability management, and eMASS evidence workflows.
• Proven ability to validate control implementations, manage POA&Ms, and coordinate remediation across engineering and operations teams.
• Strong documentation and briefing skills for audit readiness, accreditation packages, and senior leadership updates.

Nice To Haves

• Prior DoD/ARNG ISSO experience and familiarity with system authorization timelines and inspection readiness.
• Experience integrating continuous monitoring with SOC/CIRT workflows and automating evidence collection where feasible.

Responsibilities

• Manage system‑level cybersecurity programs: oversee RMF lifecycle activities, control implementation, continuous monitoring, and accreditation evidence.
• Review and validate security documentation, system security plans (SSPs), control implementation statements, POA&Ms, and configuration baselines to assess residual risk.
• Coordinate with system owners, engineers, ISSMs, assessors, and integrators to remediate control deficiencies and maintain authorization posture.
• Advise leadership on risk acceptance, compliance obligations, and remediation prioritization; prepare briefing materials for authorization and governance boards.
• Implement and monitor continuous monitoring processes: vulnerability scanning, configuration checks, patch status, and security telemetry integration.
• Support audit and inspection readiness by producing evidence packages, control test results, and remediation verification artifacts.
• Maintain documentation, control traceability, and change records to support eMASS/RMF workflows and accreditation requirements.
• Mentor and guide ISSO/technical staff on control implementation practices, evidence collection, and RMF procedures.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 5,001-10,000 employees