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# Systems & Infrastructure Administrator

- **Company:** Infinite Ranges
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Proxmox, Microsoft Windows, Active Directory, Domain Controllers, Bash Shell, Ubuntu (Operating System), Cloud Computing, Communications Protocols, Cyber Security, Dynamic Host Configuration Protocol, Debian Linux, Linux, Domain Name System (DNS), Ethernet, VMware ESX Servers, Health Information Management, Supervisory Control and Data Acquisition (SCADA), Hyper-V, Networking Hardware, Intrusion Detection Systems, Network Packet, Virtual Private Networks (VPN), Kernel-Based Virtual Machine, Linux System Administration, Linux Servers, Windows Servers, Modbus, Network Architecture, Routing, Network Segmentation, Windows PowerShell, Red Hat Enterprise Linux, Ansible, Server Administration, Security Information and Event Management, Software Systems, Database Engines, Systems Integration, Wireshark, Virtual Local Area Networks, Virtualization Technology, VMware VSphere, Web Applications, Network Routers, Computer Network Technologies, Office365, Firewalls (Computer Science), Containerization, Operational Systems, Comptia Linux+, Firewall Services Module, Terraform, Network Server, Blue Team (Cyber Security), Docker, Win CC
- **Published:** October 22, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=1b6f8e80b07eb401

## About the Role

Position Overview We are seeking a versatile Systems Administrator to architect, deploy, and maintain an isolated, high-fidelity testing environment. In this role, you will build and support a hybrid infrastructure that mirrors enterprise enterprise IT and Operational Technology (OT) networks. You will be responsible for configuring core networking, enterprise Windows Active Directory environments, Linux services, and simulated ICS/SCADA components used for cybersecurity training, testing, and red/blue team exercises., * Experience: 5+ years of hands-on experience in Systems Administration, Network Engineering, and Windows Support.

 * Systems Expertise: Strong proficiency in Windows Server Administration (Active Directory, GPO, PowerShell) and Linux Administration (Bash scripting, service management).
 * Networking Skills: Solid understanding of routing, switching, firewall configuration, network packet analysis (Wireshark), and industrial network segmentation.
 * OT/ICS Familiarity: Familiarity with OT/SCADA concepts, HMI software, PLC communication protocols, and industrial security standards (NIST SP 800-82, IEC 62443).
 * Virtualization & Cloud: Experience managing hypervisors (VMware vSphere/ESXi, KVM, Proxmox) and containerization platforms (Docker)., * Relevant certifications: CompTIA Linux+, MCSA/MCSE, CCNA, GICSP (Global Industrial Cyber Security Professional), or GRID.
 * MSFT Certifications

## Description

* 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.