Senior OT/ICS Systems Administrator & Security

Marathon TS; Charleston (SC); On-site; USD 90,000 - 120,000; Full time

Job summary

Marathon TS in Charleston, SC seeks an experienced Systems Administrator to design, implement, secure, and maintain enterprise infrastructure including OT/ICS environments. You will work across Windows servers, virtualization platforms, and network services to keep systems resilient.

The role requires strong troubleshooting, documentation, and collaboration with technical teams to support deployments, upgrades, testing, and incident response while aligning with cybersecurity standards.

Qualifications

• Minimum: 5+ years in systems administration or engineering in enterprise or OT/ICS environments.
• Hands-on with virtualization, Windows Server, networking, backups, and recovery.
• Knowledge of cybersecurity, patching, STIGs, vulnerability management and compliance.

Responsibilities

• Design, configure, maintain, and troubleshoot Windows and virtualized computing environments.
• Support VMware vSphere/ESXi or Hyper-V, Windows Server, Active Directory, and network services.
• Manage backups, storage, recovery, and disaster recovery procedures.
• Implement security configurations, patching, vulnerability remediation, and compliance requirements.
• Support network infrastructure, including TCP/IP, VLANs, firewalls, and segmentation.
• Develop and maintain technical documentation, system diagrams, tests, and procedures.
• Coordinate with teams to support deployments, upgrades, testing, and commissioning.
• Provide technical guidance and resolve complex infrastructure issues.

Skills

Virtualization

Windows Server

Networking

Backups & DR

Security hardening

Vulnerability management

Documentation

Technical leadership

PowerShell

Education

Bachelor's degree

Associate degree

High school diploma

Tools

VMware vSphere/ESXi

Microsoft Hyper-V

Active Directory

Job description

Marathon TS in Charleston, SC seeks an experienced Systems Administrator to design, implement, secure, and maintain enterprise infrastructure including OT/ICS environments. You will work across Windows servers, virtualization platforms, and network services to keep systems resilient.

The role requires strong troubleshooting, documentation, and collaboration with technical teams to support deployments, upgrades, testing, and incident response while aligning with cybersecurity standards.