System Administrator

The Keller Group is partnering with a well-established, Arizona-based organization to hire a Systems Administrator to own and support core IT infrastructure across security, server environments, virtualization, and network systems. This is a hands‑on, infrastructure-focused role—not a traditional help desk position—where you’ll work closely with leadership to maintain a stable, secure environment and act as a key resource for systems administration and escalation across the business. This is a fully onsite position, so all candidates must be in the Greater Phoenix Area. We’re looking for someone who is experienced, direct, and comfortable taking ownership of systems and driving solutions end‑to‑end in a fast‑moving environment. What You’ll Do Own Core Systems + Network Operations Manage and maintain Windows server environments and core infrastructure Monitor performance, reliability, and system uptime Troubleshoot complex issues across systems, networking, and user environments Support Microsoft 365 + Active Directory Administer Microsoft 365 (users, permissions, policies, security settings) Manage Active Directory and user access controls Support endpoint and identity‑related troubleshooting Manage Network + Security Minded Configure and support network components including firewalls, VLANs, VPNs, routing, and switching Support server security tools, patch management, and standard best practices Ensure systems meet security and compliance expectations Extra emphasis on virtualization support (Proxmox, Hyper‑V, VMWare, etc.) Support Industry Software + End Users Provide support for AutoCAD and related workstation environments Assist with troubleshooting software performance and access issues Provide onsite technical support for daily employee needs Documentation + Process Improvement Maintain clear documentation for system configurations and procedures Recommend improvements for stability, security, and efficiency What You Bring Bachelor's degree in Computer Science, Information Systems or relevant field. 5-8+ years of progressive experience with hands‑on infrastructure ownership AutoCAD experience preferred Expertise with Windows Servers, Server Management, Azure, Virtualization, and Microsoft 365 Advanced networking knowledge (firewalls, VLANs, VPNs, routing/switching) Comfortable supporting various offices and remote employees Solid grasp of troubleshooting skills and hands‑on firewall experience (SonicWall knowledge is a plus) Clear, professional communicator who's comfortable working independently Able to work in office (Monday‑Friday) Why You’ll Love It Competitive salary (DOE) with potential bonus opportunity. Strong benefits package. Stable organization with long‑term growth. Supportive, collaborative office environment with direct access to leadership. #J-18808-Ljbffr The Keller Group