{"id":3424198,"url":"https://alion.io/job/sigma-defense-systems-1784-network-security-engineer-iii","title":"1784 - Network Security Engineer III","company":{"id":685779,"name":"Sigma Defense Systems","domain":"sigmadefense.com","url":"https://alion.io/company/sigmadefense","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workable","truth_index":{"grade":"A","score":100,"open_postings":18,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":13,"computed_at":"2026-10-29T05:49:05Z"}},"role":"Security","role_family":"Security","seniority":"middle","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["San Diego, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":120000,"max":150000,"currency":"USD","period":"year","gross":null,"usd_annual":150000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"GitHub","optional":false},{"name":"GitLab","optional":false},{"name":"Linux","optional":false},{"name":"SIEM","optional":false},{"name":"Splunk","optional":false},{"name":"VMWare","optional":false},{"name":"Windows","optional":false}],"status":"live","first_seen_at":"2026-10-28T21:50:34Z","employer_posted_date":"2026-10-28","last_verified_at":"2026-10-29T14:48:25Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"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+.\nEqual 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.\nRequirements\n5 - 10 years of experience.\nMust be a U.S. citizen.\nComputer Programs/Software:\nACAS\nTrellix ESS\nSpork/Spork+\nNetIQ SIEM Sentinel\nMandatory Certifications:\nSecurity+ CE or CISSP\nAt minimum one of the following operating system/platform certifications:\nLinux\nWindows\nVMware\nCisco\nPersonnel Clearance Level:\nCandidate must possess or have the ability to obtain an active Secret security clearance or higher.\nEducation Requirements:\nBachelor's degree from an accredited college or university.\nEssential Job Duties (not all-inclusive):\nImplement and enforce DoD cybersecurity policies (STIGs, RMF, NIST SP 800-53) across CANES systems.\nDesign, Develop, implement and troubleshoot solutions for vulnerabilities within the CANES system\nLead efforts to harden Windows/Linux systems, applications, network devices, and various hardware within the CANES environment.\nAssist with IAVM compliance, log analysis, and audit readiness tasks.\nPerform patch management, system scanning, and incident response coordination.\nMaintain system documentation, cybersecurity artifacts, and baseline reports.\nSupport system validation during test events, site assessments, and production installations.\nDesign, develop, and automate configurations on the following platforms:\nRHEL expertise/Admin (RHEL 7+ ideal)\nWindows expertise/Admin (Win2019/2020 -> 2025+\nSIEM/SOAR, (ArcSight/Splunk/Sentinel etc. Sentinel & Splunk experience Preferred!)\nACAS (engineering, not just user experience)\nESS (Trellix) Engineering (not admins)\nSubmit configuration updates via GitLab/GitHub, Spork/Spork+.\nSalary Range: $120,000 - 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