System Administrator - ONI

TENAX Technologies; Washington (District of Columbia); On-site; USD 90,000 - 120,000; Full time

Job summary

TENAX Technologies is seeking a Systems Administrator to support mission-critical Navy programs in the Washington, DC area. The selected candidate will administer, maintain, and secure enterprise infrastructure across on-premises, hybrid, and AWS cloud environments.

This role supports critical DoD and IC missions, ensuring availability, security, and compliance while documenting systems and enabling modernization efforts through migrations and cloud initiatives.

Qualifications

• Experience administering Windows, Linux, and UNIX-based servers and networks.
• Experience managing AWS cloud infrastructure, services, networking, and security.
• Experience with system monitoring, patch management, and performance tuning.
• Experience implementing DISA STIGs and cybersecurity compliance requirements.
• Active Top Secret clearance with TS/SCI eligibility.
• Current DoD 8570/8140 IAT Level II or III certification or equivalent.
• Minimum 3 years of enterprise systems administration experience.

Responsibilities

• Administer and maintain Windows, Linux, and UNIX-based servers and enterprise systems.
• Manage AWS cloud infrastructure, services, networking, and security.
• Monitor system performance, troubleshoot, and resolve server/storage/network/application issues.
• Implement security patches, system hardening, and DISA STIG compliance.
• Support system modernization, migrations, upgrades, and cloud initiatives.
• Ensure system availability, integrity, confidentiality, and compliance with cybersecurity requirements.
• Maintain technical documentation and support operational and maintenance activities.

Skills

Windows Server

Linux

UNIX

AWS Cloud

Security patching

DISA STIGs

Documentation

Troubleshooting

Job description

About the Role

TENAX Technologies is seeking a Systems Administrator to support mission-critical Navy programs in the Washington, DC area. The selected candidate will administer, maintain, and secure enterprise infrastructure across on-premises, hybrid, and AWS cloud environments. This position supports critical systems and applications that enable Department of Defense (DoD) and Intelligence Community (IC) missions.

Responsibilities

• Administer and maintain Windows, Linux, and UNIX-based servers and enterprise systems.
• Manage AWS cloud infrastructure, services, networking, and security.
• Monitor system performance, perform troubleshooting, and resolve server, storage, network, and application issues.
• Implement security patches, system hardening, and DISA STIG compliance.
• Support system modernization, migrations, upgrades, and cloud initiatives.
• Ensure system availability, integrity, confidentiality, and compliance with cybersecurity requirements.
• Maintain technical documentation and support operational and maintenance activities.

Required Qualifications

• U.S. Citizen.
• Active Top Secret (TS) clearance with eligibility for TS/SCI.
• Current DoD 8570/8140 IAT Level II or IAT Level III certification (Security+, CySA+, SSCP, CND, GSEC, CISSP, CASP+/SecurityX, GCIH, or equivalent).
• Minimum 3 years of experience administering enterprise systems and networks.
• Experience supporting Linux (RHEL, Ubuntu, or similar) and Windows environments.
• Experience administering and supporting AWS cloud environments.
• Experience with system monitoring, patch management, configuration management, and performance tuning.
• Experience implementing DISA STIGs and cybersecurity compliance requirements.