1784 - Network Security Engineer III

Sigma Defense Systems; 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

Employee Assistance Program (EAP)

401(k) Plan with Company Matching

160 Hours PTO

12 Floating Holidays

Educational Assistance

Highly Competitive Salary

Job summary

Sigma Defense Systems is seeking a Network Security Engineer III in San Diego, CA to enforce DoD cybersecurity policies, manage vulnerabilities, and automate configurations across CANES environments. Must be a US citizen with 5–10 years of experience and a Bachelor's degree.

Required certifications include Security+ CE or CISSP and OS certifications. Active Secret clearance or ability to obtain is required.

Qualifications

• 5–10 years of experience in network security.
• Must be a U.S. citizen.
• Bachelor's degree from an accredited college or university.
• Active Secret security clearance or higher (or ability to obtain).
• Certifications: Security+ CE or CISSP; OS certs (Linux/Windows/VMware/Cisco).

Responsibilities

• Enforce DoD cybersecurity policies (STIGs, RMF, NIST SP 800-53) across CANES systems.
• Hardening Windows/Linux systems, applications, network devices, and hardware.
• Lead vulnerability remediation and patch management efforts.
• Assist with log analysis, audits, and audit readiness tasks.
• Design, develop, and automate configurations on RHEL/Windows, SIEM/SOAR, and CANES platforms.
• Submit configuration updates via GitLab, GitHub, Spork/Spork+.

Skills

DoD policies

Vulnerability Mgmt

System hardening

Automation (GitLab)

Splunk/Sentinel

GitHub/Spork

SIEM/SOAR

Education

Bachelor's degree

Tools

ACAS

Trellix ESS

Spork/Spork+

NetIQ Sentinel

Splunk

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.

Requirements

• 5 - 10 years of experience.
• Must be a U.S. citizen.

Computer Programs/Software

• ACAS
• Trellix ESS
• Spork/Spork+
• NetIQ 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