" \u003cdiv class=\"ja-job-details\"\u003e \u003ch2 class=\"title\"\u003eSystems \u0026amp; Infrastructure Administrator\u003c/h2\u003e \u003cdiv class=\"meta\"\u003e \u003cul class=\"classifications\"\u003e \u003cli data-id=\"20361\"\u003e Security \u003c/li\u003e \u003cli data-id=\"20362\"\u003e Security Analyst \u003c/li\u003e \u003cli data-id=\"20363\"\u003e US - Remote \u003c/li\u003e \u003cli data-id=\"20364\"\u003e Contract \u003c/li\u003e \u003c/ul\u003e \u003cp class=\"date-posted\"\u003e 23/10/2026 \u003c/p\u003e \u003c/div\u003e \u003cdiv class=\"description\"\u003e \u003cstrong\u003eJob Title:\u003c/strong\u003e Systems \u0026amp; Infrastructure Administrator (Cyber Range / OT \u0026amp; IT)\u003cbr\u003e \u0026nbsp;\u0026nbsp;\u003cbr\u003e \u003cstrong\u003ePosition Overview\u003c/strong\u003e 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.\u003cbr\u003e \u0026nbsp;\u0026nbsp;\u003cbr\u003e \u003cstrong\u003eKey Responsibilities\u003c/strong\u003e\u003cbr\u003e \u003cul\u003e \u003cli\u003e\u003cstrong\u003eNetwork Engineering \u0026amp; Infrastructure:\u003c/strong\u003e Design, implement, and maintain virtualized and physical network infrastructure (VLANs, firewalls, routers, VPNs, micro-segmentation, and Purdue Model network architecture).\u003c/li\u003e \u003cli\u003e\u003cstrong\u003eWindows Ecosystem Administration:\u003c/strong\u003e Deploy and manage Active Directory, Domain Controllers, DNS, DHCP, Group Policy (GPOs), Exchange/O365 simulations, and Windows Server/Desktop endpoints across multiple subnets.\u003c/li\u003e \u003cli\u003e\u003cstrong\u003eOT/ICS Systems Integration:\u003c/strong\u003e 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).\u003c/li\u003e \u003cli\u003e\u003cstrong\u003eLinux Systems Administration:\u003c/strong\u003e 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).\u003c/li\u003e \u003cli\u003e\u003cstrong\u003eTesting Management \u0026amp; Automation:\u003c/strong\u003e 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.\u003c/li\u003e \u003c/ul\u003e \u0026nbsp;\u0026nbsp;\u003cbr\u003e \u003cstrong\u003eQualifications \u0026amp; Requirements\u003c/strong\u003e\u003cbr\u003e \u003cul\u003e \u003cli\u003e\u003cstrong\u003eExperience:\u003c/strong\u003e 5+ years of hands-on experience in Systems Administration, Network Engineering, and Windows Support.\u003c/li\u003e \u003cli\u003e\u003cstrong\u003eSystems Expertise:\u003c/strong\u003e Strong proficiency in Windows Server Administration (Active Directory, GPO, PowerShell) and Linux Administration (Bash scripting, service management).\u003c/li\u003e \u003cli\u003e\u003cstrong\u003eNetworking Skills:\u003c/strong\u003e Solid understanding of routing, switching, firewall configuration, network packet analysis (Wireshark), and industrial network segmentation.\u003c/li\u003e \u003cli\u003e\u003cstrong\u003eOT/ICS Familiarity:\u003c/strong\u003e Familiarity with OT/SCADA concepts, HMI software, PLC communication protocols, and industrial security standards (NIST SP 800-82, IEC 62443).\u003c/li\u003e \u003cli\u003e\u003cstrong\u003eVirtualization \u0026amp; Cloud:\u003c/strong\u003e Experience managing hypervisors (VMware vSphere/ESXi, KVM, Proxmox) and containerization platforms (Docker).\u003c/li\u003e \u003c/ul\u003e \u0026nbsp;\u0026nbsp;\u003cbr\u003e \u003cstrong\u003ePreferred Qualifications\u003c/strong\u003e\u003cbr\u003e \u003cul\u003e \u003cli\u003eRelevant certifications: CompTIA Linux+, MCSA/MCSE, CCNA, GICSP (Global Industrial Cyber Security Professional), or GRID.\u003c/li\u003e \u003cli\u003eMSFT Certifications\u003cbr\u003e \u0026nbsp;\u0026nbsp;\u003c/li\u003e \u003c/ul\u003e \u003c/div\u003e \u003cdiv class=\"apply\"\u003e \u003ca class=\"back-link\" href=\"#\" title=\"Back to search results\"\u003eBack to search results\u003c/a\u003e \u003cinput type=\"button\" class=\"ja-button\" data-job-id=\"568651\" value=\"Apply Now\" title=\"Apply Now\" /\u003e \u003c/div\u003e \u003c/div\u003e "