Linux Systems Administrator

At Areté, we are on the forefront of utilizing innovative solutions, with great minds from all backgrounds, to help solve the nation's most complex security challenges. We strive for an inclusive, collaborative team environment that approaches differences as opportunities for innovation and excellence. As an employee‑owned company, we foster an atmosphere that propels diverse career opportunities and professional growth.

Discover your future with us.

We are seeking a mid‑level Linux System Administrator to support multiple Department of Defense (DoD) programs focused on the design, installation, and configuration of cyber‑compliant prototype and low‑volume production systems and networks. This role primarily supports the build, hardening, and deployment of local and fielded systems in direct support of the Warfighter. The ideal candidate will possess strong technical expertise with Red Hat Enterprise Linux (RHEL), experience working within DoD cybersecurity compliance frameworks, and the ability to support systems of varying complexity.

This is a hands‑on, on‑site position supporting mission‑critical programs with opportunities for collaboration, travel, and direct customer engagement. This is an exempt, non‑supervisory, full‑time position based in our Tucson, AZ office.

We have an impressive range of benefits, programs, and perks that we offer:

• Design, build, configure, and validate local, fielded, prototype, and low‑volume production systems in support of multiple DoD contracts.
• Install, secure, and maintain Red Hat Enterprise Linux (RHEL) systems across development, lab, and operational environments.
• Implement and validate cyber‑compliant configurations, including:
  • DISA STIG application and remediation
  • RMF control implementation and sustainment
  • SCAP and ACAS vulnerability scanning and mitigation
• Support the design, installation, and configuration of systems and networks of varying complexity.
• Collaborate with IT staff, Cyber Security teams, systems engineers, and program personnel to ensure system security and mission readiness.
• Prepare systems and associated documentation for customer acceptance, deployment, and fielding activities.
• Troubleshoot system, network, and security issues in lab and deployed environments.
• Travel occasionally to customer sites, field locations, or integration events.
• Provide limited after‑hours support during critical build, deployment, or maintenance windows.
• Develop and maintain technical documentation, system build procedures, and compliance artifacts.
• Other duties, as assigned.

• Bereavement
• Paid Time Off (PTO)
• Paid Parental Leave

• Company‑funded 5% contribution to your 401(k) retirement plan
• Company‑funded 5% contribution to your Employee Stock Ownership Plan
• Continuing Education Assistance

• Medical Insurance
• Dental & Vision Insurance
• Life Insurance and Long‑Term Disability (LTD)
• Vision Reimbursement

• Creativity and innovation in solving challenges
• Integrity and responsibility in all actions
• Collaboration across teams and specialties
• Responsiveness in fast‑paced environments
• Passion for national security and excellence

• 3‑5 years of experience as a Linux System Administrator supporting production, lab, or deployed systems.
• Strong hands‑on experience with Red Hat Enterprise Linux (RHEL) administration.
• Experience implementing DoD cybersecurity compliance requirements, including DISA STIGs, RMF, SCAP, and ACAS.
• Experience building, configuring, or deploying systems used in mission‑critical or fielded environments.
• Understanding of networking fundamentals (DNS, routing, firewalls, VLANs, SSH).
• Experience with scripting or automation (e.g., Bash, Python).
• Ability to collaborate effectively with IT, Cyber Security, engineering, and program teams.
• Willingness and ability to travel occasionally.
• Willingness to provide limited after‑hours support as required by program needs.
• Must be able to obtain and maintain a Top Secret (TS) security clearance.
• U.S. Citizenship required due to DoD contract and clearance requirements.
• Able to obtain a…