Principal Systems Security Engineer​/Senior ISSM

The Integrated Systems and Services (IAS) business area leads the design, integration and delivery of high-performance ISR and aviation systems. This position supports the U.S. Air Force’s Survivable Airborne Operations Center (SAOC) mission, developing the next‑generation airborne command post trusted by senior military leadership.

• Develop and execute the end‑to‑end cybersecurity posture, compliance governance and system accreditation for a multi‑classification defense program.
• Perform hands‑on technical security operations: vulnerability scanning, SIEM monitoring, STIG hardening, incident response and system monitoring.
• Lead the RMF/ATO strategy: author SSPs, SARs, POA/MPs, coordinate with DCSA/DOW/IC and government authorities, and brief program security status at formal USG reviews.
• Manage and mentor ISSO/ISSE staff, develop policies and procedures, and ensure ongoing compliance with NIST, ISO, DCSA and CMMC frameworks.
• Represent the program’s security posture to government stakeholders and authorizing officials, providing expert guidance and evidence to support authorization decisions.

• Bachelor’s degree in Systems Security, Network Engineering, Information Technology or related field (or 16+ years of related experience if no degree).
• 12+ years of IT security experience, with at least 8 years in a formal ISSM role and direct ATO package ownership.
• Deep expertise in cybersecurity principles and practices, including NIST 800‑53 Rev5, ISO
  27001, and RMF/ATO lifecycle management.
• Hands‑on proficiency with Nessus/Tenable, ELK Stack (Elasticsearch, Logstash, Kibana), Splunk SIEM, and DISA STIG application.
• Experience with DCSA DAAG requirements, CMMC Level2/3, PPSM creation, and classified system accreditation.
• Active U.S. Top Secret with SCI clearance and U.S. citizenship.

• Active CISSP, CISM, CASP+, or equivalent senior‑level security certification.
• IAM LevelIII or IAT LevelIII certification per DoD 8570/8140.
• Git Lab Certified Associate, Git Hub Advanced Security certification, or Red Hat Certified System Administrator.
• Experience with cross‑domain solutions (CDS), zero‑trust architecture, and enterprise Tenable Security Center deployments.
• Proficiency in IT project management (PMI/PMP) and JIRA for earned‑value tracking.

• Work primarily at a computer for extended periods.
• Participate in an on‑call rotation for incident response.
• Lift up to 25lbs occasionally.
• Work in an office or hybrid environment with occasional travel.

• Estimated starting salary: $ – $, adjusted for geographic differential.

• Annual incentive pay based on performance.

• Medical, dental and vision plans; 401(k) with 150% match up to 6%; life insurance; paid time off; tuition reimbursement; and more.

SNC is an Equal Opportunity Employer committed to an environment free of discrimination. Employment decisions are based on merit without regard to race, color, age, religion, sex, national origin, disability, veteran status or any other protected characteristic.