Secure Systems Administrator – Windows & RHEL (TS/SCI Eligible)

Sigma Defense Systems LLC; March Air Reserve Base (CA); On-site; USD 115,000 - 135,000; Full time

Benefits offered by this job

Dental and Vision Insurance

Medical Insurance incl HSA, FSA, andDF

Life and AD&D coverage

Employee Assistance Program (EAP)

401(k) Plan with Company Matching

160 Hours of Paid Time Off (PTO)

12 (Floating) Holidays

Educational Assistance

Highly Competitive Salary

Job summary

Sigma Defense Systems LLC in California at March Air Reserve Base seeks a System Administrator to maintain secure Department of War information systems by administering Windows and RHEL environments, performing routine maintenance and patching, and ensuring reliable, mission-ready operations.

You will work with engineering and cybersecurity teams to uphold secure, stable infrastructure, support DISA STIGs, CDS and FMV systems, and help coordinate system changes while documenting procedures and

Qualifications

• 3-7 years of relevant experience.
• Experience administering Windows Server and/or RHEL 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.
• Must be a U.S. citizen.

Responsibilities

• Install, configure, maintain, and troubleshoot Windows and RHEL systems.
• 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.
• Troubleshoot hardware, operating system, and application issues.
• 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.

Skills

Windows Server

RHEL

VMware ESXi

Patching

Networking concepts

DISA STIGs

CDS

FMV systems

Security clearance

System administration

Education

Bachelor's degree in Information Technology

Tools

Bash

PowerShell

Ansible

Job description

Sigma Defense Systems LLC in California at March Air Reserve Base seeks a System Administrator to maintain secure Department of War information systems by administering Windows and RHEL environments, performing routine maintenance and patching, and ensuring reliable, mission-ready operations.

You will work with engineering and cybersecurity teams to uphold secure, stable infrastructure, support DISA STIGs, CDS and FMV systems, and help coordinate system changes while documenting procedures and