1773 - System Administrator
Salary$115k – $135k
LocationMarch Air Reserve Base, California, United States
Work modeon-site
Typefull-time
SeniorityMid
Experience3–7 yrs
DepartmentSIS (SDSAFP, SDSAP)
Company size501–1,000 people
PostedOct 2, 2026 · 1w ago
Verified live19h ago
At a glanceSummarised by Seekless from the posting.
3-7 years of relevant experience
Experience administering Windows Server and/or RHEL systems
Experience installing, configuring, maintaining, and troubleshooting server operating systems
Experience with virtualization technologies such as VMware ESXi
Experience performing operating system patching, maintenance, and lifecycle support
Basic understanding of networking concepts and enterprise infrastructure
Experience supporting secure or air-gapped Department of War environments
Experience with Cross Domain Solution (CDS) technologies
Experience with Full Motion Video (FMV) systems, platforms, or supporting infrastructure
Experience implementing or maintaining DISA Security Technical Implementation Guides (STIGs)
Experience maintaining secure Windows and/or RHEL system baselines
Experience administering RHEL in physical or virtualized environments
Experience with storage, backup, and disaster recovery solutions
Security+ is required
Experience with Bash, PowerShell, Ansible, or other scripting and automation tools
Candidate must possess or have the ability to obtain an active TS/SCI security clearance or higher
Bachelor's degree from an accredited college or university in Information Technology or related field of study
RHCSA is preferred
Network+ is preferred
Linux+ is preferred
Server+ is preferred
Must be a U.S. citizen
Skills
Windows Server
RHEL
VMware ESXi
Bash
PowerShell
Ansible
DISA STIGs
Cross Domain Solution (CDS)
Full Motion Video (FMV)
Benefits
Dental insurance
Vision insurance
Medical insurance
Life insurance
Employee assistance program
401(k)
PTO
Holidays
Educational assistance
About the role
Sigma Defense is seeking a System Administrator to join our team at March Air Reserve Base. This position plays a key role in maintaining secure Department of War information systems by administering Windows and Red Hat Enterprise Linux (RHEL) environments, performing routine maintenance and patching, and ensuring reliable system operations. The Systems Administrator works closely with the engineering and cybersecurity teams to maintain secure, stable, and mission-ready infrastructure supporting Department of War operations.
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
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3-7 years of relevant experience.
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Experience administering Windows Server and/or RHEL systems.
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Experience installing, configuring, maintaining, and troubleshooting server operating systems.
•
Experience with virtualization technologies such as VMware ESXi.
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Experience performing operating system patching, maintenance, and lifecycle support.
•
Basic understanding of networking concepts and enterprise infrastructure.
•
Experience supporting secure or air-gapped Department of War environments.
•
Experience with Cross Domain Solution (CDS) technologies.
•
Experience with Full Motion Video (FMV) systems, platforms, or supporting infrastructure.
•
Experience implementing or maintaining DISA Security Technical Implementation Guides (STIGs).
•
Experience maintaining secure Windows and/or RHEL system baselines.
•
Experience administering RHEL in physical or virtualized environments.
•
Experience with storage, backup, and disaster recovery solutions.
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Must be a U.S. citizen.
Mandatory Certifications:
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Security+ is required.
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RHCSA is preferred.
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Network+ is preferred.
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Linux+ is preferred.
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Server+ is preferred.
Computer Programs/Software:
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Experience with Bash, PowerShell, Ansible, or other scripting and automation tools.
Personnel Clearance Level:
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Candidate must possess or have the ability to obtain an active TS/SCI security clearance or higher.
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Clearance may be sponsored for the right candidate.
Education Requirements:
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Bachelor’s degree from an accredited college or university in Information Technology or related field of study.
Essential Job Duties (not all-inclusive):
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Install, configure, maintain, and troubleshoot Windows and RHEL systems.
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Perform routine operating system patching, software updates, and system maintenance.
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Maintain physical and virtual server infrastructure.
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Configure and maintain user accounts, storage, system services, and server resources.
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Troubleshoot hardware, operating system, and application issues.
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Support implementation of DISA STIGs and approved system configuration changes.
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Maintain system documentation, configuration baselines, and standard operating procedures.
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Support system backups, recovery operations, and disaster recovery activities.
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Support secure Cross Domain Solution (CDS) operations and associated system administration activities.
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Coordinate with cybersecurity and network engineering personnel to implement approved system changes and maintain secure, reliable system operations.
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Support testing, integration, and implementation of approved hardware and software changes.
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Monitor system health, investigate operational issues, and resolve problems to maintain system availability and performance.
Salary Range: $115,000 - $135,000 annually.
Benefits
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Dental and Vision Insurance
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Medical Insurance to Include HSA, FSA, and DFSA Plans
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Life and AD&D coverage
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Employee Assistance Program (EAP)
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401(k) Plan with Company Matching Contributions
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160 Hours of Paid Time Off (PTO)
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12 (Floating) Holidays
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Educational Assistance
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Highly Competitive Salary