Senior Information Systems Security Officer

We are hiring a Senior Level ISSO to support mission-critical Modeling, Simulation, and Analysis (MS&A) efforts for a premier defense/government contracting client. This is a permanent, onsite role requiring a high level of expertise in securing classified information systems., * Maintain system integrity, confidentiality, and availability for classified Information Systems (IS).

• Perform technical security operations: patching, upgrades, backups, and access control

management.

• Lead Risk Management Framework (RMF) efforts to sustain system accreditation and

Authorization to Operate (ATO).

• Perform vulnerability assessments and analysis; apply STIG best practices across network and

software environments.

• Manage documentation (SSP, RAR, SCTM) within systems like eMASS.

• Support security inspections, audits, and log generation.

Minimum 12+ years of relevant experience (10 years with a Master’s degree).

• Education: Bachelor’s degree in Computer Science, Cybersecurity, or related technical field.

• Clearance: Active TS/SCI Security Clearance is mandatory.

• Certifications: Must be compliant with DoD 8140.03 (IAM Level II or III, such as CISSP or CASP+)

Knowledge/Skills/Abilities:

• Proficiency in ACAS, Nessus, SCAP, and eMASS.

• Strong background in Unix, Windows, or Cisco network administration.

• Familiarity with Intelligence Community (IC) security standards or Special Access Programs (SAP)

Benefits Industry-leading benefits package including comprehensive medical, dental, and vision insurance.

• Robust retirement planning, including 401(k) and profit-sharing potential.

• Generous Paid Time Off (PTO) and paid holidays.

• Professional development support and training opportunities.

• (Additional voluntary plans available for life insurance, disability, and wellness initiatives)., + $150,000-200,000 per year

• $65,650-118,675 per year Looking for an opportunity to make an impact? At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers…, © 2026 Careerjet All rights reserved