Systems Administrator

Systems Engineer

Marathon TS is seeking an experienced Systems Administrator to support the design, implementation, security, and maintenance of enterprise infrastructure and industrial control system (OT/ICS) environments.

Responsibilities:

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

Requirements:

• Bachelor's degree with 5+ years of relevant experience, associate's degree with 8+ years, or high school diploma/GED with 10+ years.
• Experience in systems administration or systems engineering, preferably supporting enterprise or OT/ICS environments.
• Hands-on experience with virtualization, Windows Server, networking, backups, and system recovery.
• Knowledge of cybersecurity compliance, security hardening, STIGs, vulnerability management, and system patching.
• Familiarity with industrial control system networking and security concepts.
• Strong troubleshooting, documentation, communication, and technical leadership skills.
• Active CompTIA Security+ certification or an approved higher-level certification, such as CASP+ or CISSP.
• Ability to support on-site activities and flexible schedules as required.

Preferred Qualifications:

• Experience with OT/ICS cybersecurity, SCADA, ACAS/Tenable, RMF, or NIST security frameworks.
• Familiarity with enterprise backup and storage platforms, endpoint security tools, centralized logging, PowerShell, and virtual desktop infrastructure.
• Experience supporting secure or isolated computing environments.