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Information System Security Officer (ISSO)

https://www.roberthalf.com Logo

Robert Half

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Location:
United States , Costa Mesa

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Category:
IT - Administration

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Contract Type:
Not provided

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Salary:

Not provided
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Job Description:

We are seeking a cleared Information System Security Officer (ISSO) to support classified systems operating within the DoD Risk Management Framework (RMF) and JSIG environments. This role is highly documentation‑focused and centered on ATO support, continuous monitoring, audit readiness, and compliance across multiple classified networks. The ISSO will primarily support the ISSM and may assume ownership of smaller ATO efforts based on workload and system scope. This role will be a 3–6-month contract to hire opportunity!

Job Responsibility:

  • Serve as the ISSO for multiple classified systems, supporting RMF lifecycle activities under ISSM direction
  • Create, update, and submit security authorization artifacts for: New hardware and software extensions
  • RMF updates and control changes
  • Support and maintain ATO packages, including initial authorizations, renewals, and extensions
  • Monitor and assess 3–5 classified networks, averaging ~1 hour per network for compliance and security reviews
  • Execute and document continuous monitoring activities using approved security tools
  • Participate in and support routine audits, inspections, and DoD compliance submissions
  • Partner with IT and engineering teams to ensure controls, scans, and audit activities are executed correctly
  • Conduct vulnerability scanning on a recurring schedule
  • Support systems currently partially complete within the NIST RMF lifecycle
  • Participate in regular stakeholder syncs with ISSM, IT, security teams, and government representatives
  • Operate within a classified, air-gapped environment supporting a mixed operating system infrastructure

Requirements:

  • Active TS/SAP clearance
  • Candidates with frequent international travel or foreign relationships may experience delays during SAP read-on
  • Strong working knowledge of: JSIG
  • NIST RMF processes
  • Hands-on experience with: Security audits
  • Vulnerability scanning
  • Security tools used in continuous monitoring
  • ATO experience
  • Experience supporting ATO packages required
  • Some level of ATO ownership acceptable
  • Must be able to execute independently without significant coaching
  • Strong documentation skills with a high attention to detail
What we offer:
  • medical, vision, dental, and life and disability insurance
  • 401(k) plan

Additional Information:

Job Posted:
May 04, 2026

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