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1773 - System Administrator

Sigma Defense

Responsibilities

  • Perform routine operating system patching, software updates, and system maintenance.
  • Maintain physical and virtual server infrastructure.
  • Configure and maintain user accounts, storage, system services, and server resources.
  • Support implementation of DISA STIGs and approved system configuration changes.
  • Maintain system documentation, configuration baselines, and standard operating procedures.
  • Support system backups, recovery operations, and disaster recovery activities.
  • Support secure Cross Domain Solution (CDS) operations and associated system administration activities.
  • Coordinate with cybersecurity and network engineering personnel to implement approved system changes and maintain secure, reliable system operations.
  • Support testing, integration, and implementation of approved hardware and software changes.
  • Monitor system health, investigate operational issues, and resolve problems to maintain system availability and performance.

Requirements

  • 3-7 years of relevant experience.
  • Experience administering Windows Server and/or RHEL systems.
  • Experience installing, configuring, maintaining, and troubleshooting server operating systems.
  • 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 administering RHEL in physical or virtualized environments.
  • Experience with storage, backup, and disaster recovery solutions.
  • Must be a U.S. citizen.

Preferred

  • Experience with Bash, PowerShell, Ansible, or other scripting and automation tools.

Description

![](https://workablehr.s3.amazonaws.com/uploads/photos/31138/1086fb6ad7158f1f135e80f620c1cef3.jfif)

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

  • Experience with virtualization technologies such as VMware ESXi.
  • 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.

Mandatory Certifications

  • Security+ is required.
  • RHCSA is preferred.
  • Network+ is preferred.
  • Linux+ is preferred.
  • Server+ is preferred.

Personnel Clearance Level

  • Candidate must possess or have the ability to obtain an active TS/SCI security clearance or higher.
  • _Clearance may be sponsored for the right candidate._

Education Requirements

Bachelor's degree from an accredited college or university in Information Technology or related field of study.

Essential Job Duties (not all-inclusive)

  • Install, configure, maintain, and troubleshoot Windows and RHEL systems.
  • Troubleshoot hardware, operating system, and application issues.
  • Salary Range: $115,000 - $135,000 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

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