Remote Systems & Infrastructure Admin - OT/ICS

Infinite Ranges; Illinois; On-site; USD 90,000 - 120,000; Part time

Job summary

Infinite Ranges seeks a versatile Systems Administrator to design, deploy, and maintain a high-fidelity remote testing environment mirroring enterprise IT and OT networks for cybersecurity training and red/blue team exercises.

You will configure Windows Active Directory, Linux servers, OT/ICS components, and virtualization platforms (VMware, Proxmox, Hyper-V) while automating with Terraform, Ansible, and Packer.

Qualifications

• 5+ years of hands-on experience in Systems Administration, Network Engineering, and Windows Support.
• Strong proficiency in Windows Server Administration (Active Directory, GPO, PowerShell) and Linux Administration (Bash scripting, service management).
• Solid understanding of routing, switching, firewall configuration, network packet analysis (Wireshark), and industrial network segmentation.
• Familiarity with OT/SCADA concepts, HMI software, PLC communication protocols, and IEC 62443/NIST SP 800-82.
• Experience managing hypervisors (VMware vSphere/ESXi, KVM, Proxmox) and containerization platforms (Docker).

Responsibilities

• Network Engineering & Infrastructure: Design, implement, and maintain virtualized and physical network infrastructure (VLANs, firewalls, routers, VPNs, micro-segmentation, and Purdue Model network architecture).
• Windows Ecosystem Administration: Deploy and manage Active Directory, Domain Controllers, DNS, DHCP, Group Policy (GPOs), Exchange/O365 simulations, and Windows Server/Desktop endpoints across multiple subnets.
• OT/ICS Systems Integration: Deploy, configure, and maintain Operational Technology environments, including SCADA servers, HMIs, PLCs (physical or emulated), and industrial protocols (Modbus, DNP3, Ethernet/IP, IEC 60870-5-104).
• Linux Systems Administration: Provision and maintain Linux servers (RHEL, Ubuntu, Debian) hosting supporting range services, database engines, web applications, and security monitoring tools (e.g., SIEM, IDS/IPS).
• Testing Management & Automation: Utilize virtualization platforms (VMware vSphere/ESXi, Proxmox, Hyper-V) and infrastructure-as-code (Terraform, Ansible, Packer) to quickly deploy, snapshot, reset, and tear down training range scenarios.

Skills

Systems Administration

Network Engineering

Windows Support

Linux Administration

Scripting & Automation

Tools

VMware vSphere/ESXi

Proxmox

KVM

Docker

Packer

Terraform

Ansible

Job description

Infinite Ranges seeks a versatile Systems Administrator to design, deploy, and maintain a high-fidelity remote testing environment mirroring enterprise IT and OT networks for cybersecurity training and red/blue team exercises.

You will configure Windows Active Directory, Linux servers, OT/ICS components, and virtualization platforms (VMware, Proxmox, Hyper-V) while automating with Terraform, Ansible, and Packer.