1784 - Network Security Engineer III
- Salary
- $120,000 - $150,000 annually
- Level
- Senior
Not stated in the posting: work type, visa.
Open. First seen 28 October 2026.
About the role
Sigma Defense is seeking a Network Security Engineer III to join our team in San Diego, CA. This position supports the enforcement of DoD cybersecurity policies (STIGs, RMF, NIST SP 800-53) across CANES environments while leveraging expertise in ACAS, Trellix ESS, NetIQ Sentinel, and Splunk. This role requires hands-on system hardening, vulnerability management, and configuration automation via GitLab, GitHub, and Spork/Spork+.
Sigma Defense's standard text
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.
Requirements
- 5 - 10 years of experience.
- Must be a U.S. citizen.
Computer Programs/Software:
- ACAS
- Trellix ESS
- Spork/Spork+
- NetIQ SIEM Sentinel
Mandatory Certifications:
- Security+ CE or CISSP
- At minimum one of the following operating system/platform certifications:
- Linux
- Windows
- VMware
- Cisco
Personnel Clearance Level:
- Candidate must possess or have the ability to obtain an active Secret security clearance or higher.
Education Requirements:
- Bachelor's degree from an accredited college or university.
Essential Job Duties (not all-inclusive):
- Implement and enforce DoD cybersecurity policies (STIGs, RMF, NIST SP 800-53) across CANES systems.
- Design, Develop, implement and troubleshoot solutions for vulnerabilities within the CANES system
- Lead efforts to harden Windows/Linux systems, applications, network devices, and various hardware within the CANES environment.
- Assist with IAVM compliance, log analysis, and audit readiness tasks.
- Perform patch management, system scanning, and incident response coordination.
- Maintain system documentation, cybersecurity artifacts, and baseline reports.
- Support system validation during test events, site assessments, and production installations.
- Design, develop, and automate configurations on the following platforms:
- RHEL expertise/Admin (RHEL 7+ ideal)
- Windows expertise/Admin (Win2019/2020 -> 2025+
- SIEM/SOAR, (ArcSight/Splunk/Sentinel etc. Sentinel & Splunk experience Preferred!)
- ACAS (engineering, not just user experience)
- ESS (Trellix) Engineering (not admins)
- Submit configuration updates via GitLab/GitHub, Spork/Spork+.
Salary Range: $120,000 - $150,000 annually.
Benefits
- Dental and Vision Insurance
- Medical Insurance to Include HSA, FSA, and DFSA Plans
- Life and AD&D coverage
- Employee Assistance Program (EAP)
- 401(k) Plan with Company Matching Contributions
- 160 Hours of Paid Time Off (PTO)
- 12 (Floating) Holidays
- Educational Assistance
- Highly Competitive Salary
What this role asks for
Particular to this role
GitHub · GitLab · SIEM · Splunk
Rare in Sigma Defense's other 37 open postings.
Standard for security roles
Cybersecurity
Common in security postings at any company.
87% of this description is written for the role. The rest is Sigma Defense's standard text, folded away below.
Compared with Sigma Defense's other open jobs.
The team: IMS (IMSENG, IMSPRG, IMSNM, IMST&R)
This role is one of 12 open in IMS (IMSENG, IMSPRG, IMSNM, IMST&R). 11 were posted in the last 30 days.
WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS
Cybersecurity (7 of 12), Linux (6 of 12), Cisco (5 of 12), Python (5 of 12), VMware (5 of 12), Ansible (3 of 12), PowerShell (3 of 12)
OTHER ROLES ON THIS TEAM
- 1785 - Network Security Engineer II posted Oct 28
- 1519 - Systems Engineer III posted Oct 27
- 1742 - Junior System Administrator posted Oct 27
- 1778 - Web Developer posted Oct 27
- 1760 - Application Developer posted Oct 27
- 1520 - Network Engineer I - III posted Oct 27
- 1335 - Systems Engineer III posted Oct 27
- 1655 - Senior Software Developer posted Oct 21
- 1699 - Network Engineer IV posted Oct 21
- 1783 - IT Program Manager posted Oct 20
- 1751 - Senior Systems Analyst: Training Technical Assessment SME posted Sep 15
From the team and dates on Sigma Defense's own job board.
See Security Engineer salaries in the United States →
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