Systems Administrator

TIAG; Port Hueneme (CA); On-site; USD 105,000 - 115,000; Full time

Job summary

TIAG seeks a Systems Administrator / Security Engineer to lead hands-on administration, maintenance, and security hardening across IT/OT at Port Hueneme, CA. You will own vulnerability management, RMF/ATO activities, and DISA STIG compliance to sustain Authority to Operate in DoD environments.

The role emphasizes proactive risk reduction, incident prevention, and collaboration with ISSOs and project teams to ensure mission readiness of enterprise servers, workstations, and deployable assets.

Qualifications

• Bachelor's degree in Information Technology, Computer Science, Cybersecurity, or related field.
• 5+ years in systems administration, infrastructure operations, or cybersecurity within federal/military DoD environments.
• Hands-on experience configuring Windows, Linux, and macOS platforms.

Responsibilities

• Administer, configure, monitor, and troubleshoot enterprise Windows, Linux, and macOS systems and devices.
• Maintain deployable hardware packages and expeditionary capabilities for readiness baselines.
• Execute vulnerability scans with ACAS, Nessus, and SCAP Checker and drive remediation across IT/OT.
• Harden environments per DISA STIGs, baselines, and patch requirements; support RMF/ATO artifacts.
• Develop security diagrams and provide technical leadership to cross-functional teams.

Skills

Systems administration

Security engineering

Vulnerability assessment

DISA STIGs

RMF/ATO processes

Windows/Linux/macOS

Education

Bachelor's Degree in IT/CS/Cybersecurity

Tools

ACAS

Nessus

SCAP Compliance Checker

eMASS

VRAM

STIG Viewer

Job description

Job Details

Job Location: Port Hueneme, CA 93043, Position Type: Full Time, Salary Range: $105,000.00 - $115,000.00 Salary/year, Travel Percentage: None

TIAG is now hiring a Systems Administrator / Security Engineer to serve as a key technical authority driving the hands‑on administration, maintenance, and security hardening across a converged Information Technology (IT) and Operational Technology (OT) environment at Port Hueneme, CA.

In this role, the Systems Admin/Engineer will take end‑to‑end ownership of maintaining operational continuity, visibility, and resilience for enterprise servers, workstations, virtualization platforms, OT/ICS hardware, and specialized deployable assets such as fly‑away kits.

This position requires a full‑time, onsite schedule (M-F) during standard business hours in support of mission‑focused Navy and Department of Defense (DoD) environments. The ideal candidate brings an authoritative, proactive mindset to systems administration, vulnerability management, and defense compliance. The Systems Administrator/Engineer will need to possess deep expertise executing ACAS and Nessus vulnerability scans, implementing DISA STIGs, and supporting Risk Management Framework (RMF) execution to achieve and maintain Authority to Operate (ATO) status.

As a collaborative thought partner to project leads, Information System Security Officers (ISSOs), and client leadership, they will resolve complex technical issues, mentor junior team members, and ensure system readiness across diverse IT/OT infrastructure.

Positions Responsibilities include:

• 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 independent vulnerability scans using ACAS, Nessus, and SCAP Compliance Checker, prioritizing and validating technical remediation across IT/OT systems.
• Harden operating environments, OT/ICS components, and specialized endpoints in alignment 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 within eMASS and VRAM.
• Perform routine system hygiene, account management, endpoint maintenance, asset tracking, and log reviews to ensure continuous compliance and operational readiness.
• Develop security architecture diagrams and control-to-component traceability, while providing technical leadership and mentoring to cross‑functional team members.

Qualifications: Required Skills and Qualifications

• Active Secret Security Clearance (with Top Secret eligibility).
• 5+ years of progressive experience in systems administration, infrastructure operations, or cybersecurity engineering within a federal, military, Navy, or DoD/DoW environment.
• 5+ years of hands‑on experience configuring, maintaining, and troubleshooting Windows, Linux, and macOS platforms.
• Demonstrated experience independently running, analyzing, and remediating vulnerability scans using ACAS, Nessus, or comparable tools. -Proven track record 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 proficiency troubleshooting hardware, OS, network, access, and configuration issues through final resolution.
• Bachelor’s Degree in Information Technology, Computer Science, Cybersecurity, or a related technical discipline (or equivalent professional experience).

Preferred Qualifications

• DoD 8140/8570 IAT Level II Certification (e.g., CompTIA Security+, CySA+, SecurityX, or CISSP).
• Hands‑on experience supporting Operational Technology (OT), Industrial Control Systems (ICS), or industrial networks.
• Direct experience configuring, maintaining, and validating deployable IT packages or expeditionary fly‑away kits.
• Advanced 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.

TIAG is an equal opportunity employer and federal contractor or subcontractor. Consequently, the parties agree that, as applicable, they will abide by the requirements of 41 CFR 60-1.4(a), 41 CFR 60-300.5(a), and 41 CFR 60-741.5(a) and employment decisions shall be based solely on merit and without regard disability, or protected veteran status, or any other characteristic protected by local, state, or federal laws, rules, or regulations. TIAG takes proactive steps to employ and advance in employment qualified individuals without regard to disability or protected veteran status. The parties also agree that, as applicable, they will abide by the requirements and may be subject and required to take action pursuant to the following laws and accompanying regulations:

The Vietnam Era Veterans Readjustment Assistance Act of 1974, as amended (and its implementing regulations at 41 C.F.R. 60-300); Section 503 of the Rehabilitation Act of 1973, as amended (and its implementing regulations at 41 C.F.R 60-741); and Executive Order 13496 (and its implementing regulations at 29 C.F.R. part 471, Appendix A to Subpart A).