Cyber System Administrator: IT/OT Security & RMF Expert

Unity Technologies Corporation; Columbus (OH); On-site; USD 90,000 - 130,000; Full time

Job summary

UnityTec in Columbus, OH seeks a Cyber System Administrator to administer, secure, and maintain IT and OT/ICS systems, ensuring compliance with federal cybersecurity standards and supporting RMF assessments. You will implement secure configurations, manage lifecycles, and keep documentation current in coordination with engineering and cybersecurity teams.

The role covers applying DISA STIGs, DoD 8140.03, privileged access management, and collaboration with asset owners across IT and OT

Qualifications

• Required DoD-style security certifications (IAT/SA level) such as Security+ CE, CySA+, CASP+, or equivalent.
• Bachelor’s degree in information systems, CS, cybersecurity, engineering, or related field.
• At least 3 years of hands-on system administration experience (Windows and/or Linux) in enterprise or DoD environments, including virtualization (VMware).
• Experience implementing or supporting DISA STIGs, vulnerability remediation, and secure baselines.
• Understanding RMF, NIST SP 800-53, and basic network security concepts (TCP/IP, VLANs, 802.1x/port security).
• Preferred: DoD or customer environments, OT/ICS experience, Zero Trust familiarity.

Responsibilities

• System Administration & Lifecycle Maintenance: Install, configure, patch, backup, and upgrade servers, OT/ICS components; manage maintenance tasks.
• Cybersecurity Compliance & Security Controls Implementation: Apply DISA STIGs and NIST requirements; document exceptions with cybersecurity teams.
• RMF Support & Accreditation Artifacts: Provide technical evidence for RMF assessments and ATC decisions.
• Privileged Access Management & DoDM 8140.03 Requirements: Manage privileged accounts and required training; support workforce reporting.
• OT/ICS/Facilities Systems Support: Install, configure, patch, backup, test OT/ICS and facility IoT systems with engineers and asset owners.
• Secure Network Configuration & Communications Controls: Implement secure networks (VLANs, 802.1X, port security) and secure wireless/cell connectivity.
• Architecture Documentation & Configuration Management: Maintain as-built architecture and PERA alignment.

Skills

IAT/SA-level certifications

RMF/NIST knowledge

Zero Trust familiarity

Network security concepts (VLANs, 802.

Education

Bachelor’s degree in information systems, computer science, cybersecurity, engineering, or related field

Tools

VMware

Windows Server

Linux

Job description

UnityTec in Columbus, OH seeks a Cyber System Administrator to administer, secure, and maintain IT and OT/ICS systems, ensuring compliance with federal cybersecurity standards and supporting RMF assessments. You will implement secure configurations, manage lifecycles, and keep documentation current in coordination with engineering and cybersecurity teams.

The role covers applying DISA STIGs, DoD 8140.03, privileged access management, and collaboration with asset owners across IT and OT