Systems Administrator

TIAG • Port Hueneme, CA

21d • $105,000 - $115,000 • Onsite

About The Position

TIAG is hiring a Systems Administrator / Security Engineer to provide hands-on administration, maintenance, and security hardening across a converged IT and OT environment at Port Hueneme, California. The role owns operational continuity, visibility, and resilience for enterprise servers, workstations, virtualization platforms, OT/ICS hardware, and deployable assets such as fly-away kits. The position supports mission-focused Navy and Department of Defense environments on a full-time, onsite schedule, Monday through Friday, during standard business hours.

The Systems Administrator / Security Engineer performs vulnerability management and defense compliance, including ACAS and Nessus scanning, implementation of DISA STIGs, and support for Risk Management Framework (RMF) execution to achieve and maintain Authority to Operate (ATO) status. The role collaborates with project leads, ISSOs, and client leadership to resolve complex technical issues, mentor junior team members, and ensure readiness across varied IT/OT infrastructure.

Requirements

• Active Secret security clearance with Top Secret eligibility.
• At least 5 years of progressive experience in systems administration, infrastructure operations, or cybersecurity engineering in a federal, military, Navy, or DoD/DoW environment.
• At least 5 years of hands-on experience configuring, maintaining, and troubleshooting Windows, Linux, and macOS platforms.
• Demonstrated ability to independently run, analyze, and remediate vulnerability scans using ACAS, Nessus, or comparable tools.
• Experience applying DISA STIGs, security baselines, system hardening, and patch management across enterprise networks and hardware.
• Direct experience supporting technical RMF and ATO artifact generation, control implementation, and remediation tracking.
• Strong troubleshooting skills across hardware, operating systems, networks, access, and configuration through final resolution.
• Bachelor’s degree in Information Technology, Computer Science, Cybersecurity, or a related technical discipline, or equivalent professional experience.

Nice To Haves

• DoD 8140/8570 IAT Level II certification, such as CompTIA Security+, CySA+, SecurityX, or CISSP.
• Hands-on experience supporting Operational Technology (OT), Industrial Control Systems (ICS), or industrial networks.
• Experience configuring, maintaining, and validating deployable IT packages or expeditionary fly-away kits.
• Familiarity with DoD compliance management tools, including eMASS, VRAM, STIG Viewer, and SCAP Compliance Checker.
• Knowledge of NIST SP 800-53 and CNSSI 1253 security controls and architecture traceability.

Responsibilities

• Administer, configure, monitor, and troubleshoot enterprise Windows, Linux, and macOS systems, servers, workstations, network devices, security appliances, and virtualized platforms.
• Maintain deployable hardware packages and expeditionary capabilities, including fly-away kits, peripherals, operating systems, security controls, and readiness baselines.
• Execute and analyze vulnerability scans using ACAS, Nessus, and SCAP Compliance Checker, and prioritize and validate remediation across IT/OT systems.
• Harden operating environments, OT/ICS components, and specialized endpoints in accordance with DISA STIGs, security baselines, and patching requirements.
• Support RMF and ATO processes by implementing security controls, generating control narratives, producing technical evidence, and managing data in eMASS and VRAM.
• Perform routine system hygiene, account management, endpoint maintenance, asset tracking, and log reviews to maintain compliance and operational readiness.
• Develop security architecture diagrams and control-to-component traceability.
• Provide technical leadership and mentor cross-functional team members.
• Collaborate with project leads, ISSOs, and client leadership to resolve complex technical issues and ensure system readiness.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level