System Administrator - ONI with Security Clearance

TENAX Technologies, LLC; Washington (District of Columbia); On-site; USD 110,000 - 160,000; 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 position supports critical systems and applications that enable DoD and IC missions. Responsibilities include administering Windows, Linux, and UNIX‑based servers; managing AWS services; monitoring performance; applying security

Qualifications

• U.S. Citizen.
• Active Top Secret (TS) clearance with eligibility for TS/SCI.
• Current DoD 8570/8140 IAT Level II or 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.
• Bachelor's degree in Computer Science, Information Technology, Systems Engineering, or related field.
• 5+ years of Systems Administration and/or Network Administration experience.
• AWS certification (Cloud Practitioner, Solutions Architect, SysOps Administrator, or equivalent).
• Linux certification (RHCSA, RHCE, Linux+, or equivalent).
• CCNP or equivalent networking certification.
• Experience supporting DoD, Navy, Intelligence Community, or Federal Government environments.
• Knowledge of virtualization, enterprise storage, backup and recovery solutions, and hybrid cloud architectures.

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.

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.
• Strong troubleshooting skills across servers, networks, storage, and applications.
• Bachelor's degree in Computer Science, Information Technology, Systems Engineering, or related field.
• 5+ years of Systems Administration and/or Network Administration experience.
• AWS certification (Cloud Practitioner, Solutions Architect, SysOps Administrator, or equivalent).
• Linux certification (RHCSA, RHCE, Linux+, or equivalent).
• CCNP or equivalent networking certification.
• Experience supporting DoD, Navy, Intelligence Community, or Federal Government environments.
• Knowledge of virtualization, enterprise storage, backup and recovery solutions, and hybrid cloud architectures.
• Why TENAX? At TENAX Technologies, you'll support mission-critical national security programs while working with modern technologies across cloud, cybersecurity, and enterprise infrastructure environments. You'll collaborate with experienced professionals in a dynamic team focused on innovation, operational excellence, and mission success. We are committed to investing in our employees through professional development, technical training, and opportunities for career growth and advancement. TENAX Technologies is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, protected veteran status, or any other characteristic protected by law.