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 & Vision Insurance

Health Insurance (HSA/FSA)

Life/AD&D

EAP

401(k) Match

PTO 160h

Floating Holidays 12

Educational Assistance

Competitive Salary

Job summary

Sigma Defense in San Diego, CA seeks a Network Security Engineer III to enforce DoD cybersecurity policies across CANES environments, with hands-on vulnerability management and configuration automation via GitLab/GitHub/Spork.

The role requires 5–10 years of experience, U.S. citizenship, and a Bachelor's degree. Responsibilities include patch management, log analysis, audit readiness, and coordinating incident responses within a CANES context.

Qualifications

• 5–10 years of experience in network security or DoD environments.
• U.S. citizenship required.
• Bachelor's degree from an accredited college or university.

Responsibilities

• Implement and enforce DoD cybersecurity policies (STIGs, RMF, NIST SP 800-53) across CANES systems.
• Design, develop, implement and troubleshoot vulnerabilities and mitigations for CANES system.
• Lead efforts to harden Windows/Linux systems, applications, network devices, and hardware within 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.
• Design, develop, and automate configurations on RHEL 7+ and Windows (Win2019/2020+).
• SIEM/SOAR platforms (Splunk, Sentinel, ArcSight) engineering work.

Education

Bachelor's degree

Tools

ACAS

Trellix ESS

Spork/Spork+

NetIQ Sentinel

Splunk

ArcSight

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