Sigma Defense
1773 - System Administrator
$115K–$135K
March Air Reserve Base, California · Full-time · Posted Oct 27, 2026
- Experience
- 3–7 years of relevant experience.
- Education
- Bachelor's degree from an accredited college or university in Information Technology or a related field of study.
About the job
Administers secure Windows and RHEL systems and server infrastructure, maintaining patches, system availability, and compliance in support of Department of War operations.
What you'll do
- Install, configure, maintain, and troubleshoot Windows and RHEL systems, including physical and virtual servers.
- Perform OS patching and maintenance; support DISA STIG implementation, system baselines, backups, and recovery.
- Support secure CDS operations and coordinate approved system changes with cybersecurity and network engineering teams.
What they ask for
- Experience administering Windows Server and/or RHEL systems and supporting server operating systems.
- Experience with virtualization technologies such as VMware ESXi, OS patching, and maintenance.
- Security+ certification is required.
- Must be a U.S. citizen; must possess or be able to obtain an active TS/SCI clearance or higher.
Nice to have
- RHCSA, Network+, Linux+, or Server+ certification.
- Experience with secure or air-gapped Department of War environments, CDS, FMV, DISA STIGs, RHEL administration, or storage and disaster recovery.
Pay
$115,000 - $135,000 annually (base salary)
Tools
Windows Server, Red Hat Enterprise Linux (RHEL), VMware ESXi, Bash, PowerShell, Ansible, Cross Domain Solution (CDS), DISA Security Technical Implementation Guides (STIGs)
Model-written summary · the original posting is authoritative