Network Security Subject Matter Expert I

Sigma Defense

Sigma Defense Systems is a leading technology company serving the Department of Defense (DoD), providing tactical communications systems and services for digital modernization since 2006. Through our acquisitions of SOLUTE in January 2022 and Sub U Systems in May 2022, we have expanded our software and communications hardware solutions to better support JADC2, C5ISR, SATCOM, and DEVSECOPS for customers in the Army, Navy, Air Force, Marine Corps, and Space Force. Through a combination of hardware, software, and industry expertise, we provide a complete portfolio of solutions and services that accelerates information collection and sharing for faster decision making and better mission outcomes.

Why would you work for us? Quite simply, the work we do is meaningful and stimulating. We promote initiative and independent thought; we encourage direct client engagement to ensure we are delivering what the customer wants; and our engineers and scientists are working on cutting-edge projects that move the state-of-the-art closer to the people who need them. If you’re looking for technical challenges and an opportunity to take a leadership role in an environment that encourages you to excel, then WE are your destination.

We are a company of innovative professionals thriving in a highly motivating work environment that fosters creativity and independent thinking. If you are a motivated individual with a desire to support our service men and women, now is a great time to join Sigma Defense!

Discover your next mission with Sigma Defense – Find and follow us at Sigma Defense Systems LLC: Overview LinkedIn and visit Sigma Defense A Leading Technology Company for more information.

Equal Opportunity Employer/Veterans/Disabled: Sigma Defense Systems is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

We are seeking a Network Security Subject Matter Expert I to work on-site at March AFB in Riverside County, California with experience in FMV Network Security Sustainment and Development.


Personnel Clearance Level:

  • Possess or have the ability to obtain an active DoD issued Secret security clearance. A clearance will be sponsored for the right candidate.

Education Requirements:

  • Bachelor’s Degree from an accredited college or university in IT, Networking or Security.

Mandatory Certifications:

  • Comptia Security+,
  • Comptia Network+

Programs/Software Experience:

  • CISSP experience is preferred.
  • Kubernetes, open-source tools, and DoD Platform One experience is mandatory.

Essential Job Duties:

  • Provide accreditation support – work with Information Assurance (IA) personnel to evaluate and determine the appropriate Risk Management Framework (RMF) accreditation approach for any updates and/or changes to the existing accreditation package.
  • Support continuous monitoring using established vulnerability management processes.
  • Conduct manual DISA-directed Security Technical Implementation Guidelines (STIG) on a quarterly basis.
  • Develop Plans of Actions and Milestones (PoA&Ms) to mitigate findings from the STIG review.
  • Provide updated security artifacts based on changes to the network baseline.
  • Provide updated information and/or documentation to the Government Technical Point of Contact (TPOC).
  • Provide engineering sustainment to ensure network architecture is up to government-approved baseline standards.
  • Responsible for exploring / implementing new innovative technologies to enhance the GC2 capabilities for the enterprise, such as Infrastructure-as-Code, Kubernetes, and the USAF’s Platform One microservices or equivalent cloud technologies for efficient on-premises use.

Salary Range: $140,000 – $170,000 annually.


  • Dental and Vision Insurance
  • Medical Insurance to Include an HSA Plan and HRA Plan Which Features a $6,000 Health Reimbursement
  • Life and A&D coverage
  • Employee Assistance Program (EAP)
  • 401(k) Plan with Company Matching Contributions
  • 160 Hours of Paid Time Off (PTO) with Carry-Over up to 240 hours
  • 12 (Floating) Holidays
  • Educational Assistance
  • Highly Competitive Salary

To help us track our recruitment effort, please indicate in your cover/motivation letter where ( you saw this job posting.