1784 - Network Security Engineer III

SIGMA DEFENSE; San Diego (CA); On-site; USD 120,000 - 150,000; Full time

Benefits offered by this job

Dental and Vision Insurance

Medical Insurance (HSA, FSA, DFSA)

Life and AD&D coverage

EAP

401(k) Plan with Company Matching

Paid Time Off (PTO) 160 hours

12 Holidays

Educational Assistance

Highly Competitive Salary

Job summary

Sigma Defense is hiring a Network Security Engineer III to join our team in San Diego, CA. You will enforce DoD cybersecurity policies across CANES environments and drive hands-on hardening, vulnerability management, and automation using GitLab/GitHub and Spork/Spork+.

The role requires 5–10 years of experience, US citizenship, and the ability to obtain/maintain an active Secret clearance or higher. Certifications such as Security+ CE or CISSP are preferred.

Qualifications

• Bachelor's degree from an accredited college or university.
• 5-10 years of experience in network security or DoD environments.
• Must be a U.S. citizen; ability to obtain/maintain active Secret clearance or higher.

Responsibilities

• Implement and enforce DoD cybersecurity policies (STIGs, RMF, NIST SP 800-53) across CANES systems.
• Design, develop, implement and troubleshoot vulnerability remediation and mitigations.
• Lead hardening of Windows/Linux systems, applications, and network devices within CANES.
• Coordinate patch management, vulnerability scanning, and incident response activities.
• Maintain security documentation, artifacts, and baseline reports.

Education

Bachelor's degree

Tools

ACAS

Trellix ESS

Spork/Spork+

NetIQ Sentinel

Splunk

ArcSight/Sentinel

Job description

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+.

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.

• 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.

• 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