System Administrator (Onsite in Denver, CO)

Position Summary The Systems Administrator is responsible for maintaining, supporting, and improving the organization’s Windows‑based IT infrastructure. This role provides day‑to‑day administration of servers, workstations, user accounts, Microsoft services, backups, security controls, and network connectivity. The ideal candidate has strong Windows systems experience, practical networking knowledge, and a service‑oriented approach to supporting business operations. Key Responsibilities Administer and support Windows Server environments, including Active Directory, Group Policy, DNS, DHCP, file services, print services, and server roles. Manage user accounts, groups, permissions, shared drives, and access controls. Support Microsoft 365 services, including Exchange Online, Teams, SharePoint, OneDrive, and Entra ID/Azure AD. Maintain Windows workstations, laptops, and server operating systems through patching, updates, configuration, and troubleshooting. Monitor system performance, availability, backups, and capacity. Assist with endpoint management, imaging, deployment, antivirus/EDR tools, and device configuration. Maintain documentation for systems, configurations, procedures, and support processes. Participate in system upgrades, migrations, hardware refreshes, and infrastructure improvement projects. Support basic to intermediate network administration, including switches, VLANs, wireless access points, firewalls, VPNs, and routing. Troubleshoot LAN/WAN connectivity issues, network performance problems, and end‑user access issues. Assist with network cabling, port configuration, IP addressing, DNS/DHCP troubleshooting, and device connectivity. Work with vendors, ISPs, and internal teams to resolve network outages or service issues. Help maintain network documentation, diagrams, device inventories, and configuration records. Apply security best practices for Windows systems, user access, privileged accounts, endpoint protection, and patch management. Monitor alerts, logs, and system events to identify and respond to issues. Support backup, disaster recovery, business continuity, and incident response activities. Assist with audits, access reviews, vulnerability remediation, and policy enforcement. Provide escalated support for help desk tickets related to systems, applications, access, hardware, and networking. Troubleshoot issues with Windows desktops, printers, mobile devices, remote access, and line‑of‑business applications. Communicate clearly with end users, vendors, and team members. Participate in after‑hours support, maintenance windows, or on‑call rotation as needed. Required Qualifications 3+ years of experience in systems administration, desktop support, network support, or a related IT role. Strong experience with Windows Server and Windows desktop operating systems. Hands‑on experience with Active Directory, Group Policy, DNS, DHCP, file permissions, and user administration. Working knowledge of Microsoft 365 administration. Practical networking knowledge, including TCP/IP, VLANs, routing, switching, wireless, firewalls, and VPNs. Experience troubleshooting hardware, software, operating system, and network issues. Familiarity with backup systems, endpoint protection, monitoring tools, and patch management. Ability to document procedures, configurations, and troubleshooting steps. Strong problem‑solving skills and the ability to manage multiple priorities. Preferred Qualifications Experience with virtualization platforms such as VMware, Hyper‑V or Nutanix. Experience with Azure, Entra ID, Intune, or hybrid Microsoft environments. Familiarity with PowerShell scripting and automation. Experience with firewall platforms, managed switches, wireless controllers, or SD‑WAN. Experience with ticketing systems and IT asset management tools. Certifications such as CompTIA Network+, Security+, Microsoft Certified: Windows Server Hybrid Administrator, Azure Administrator, or equivalent experience. Physical and Work Requirements Ability to lift and move IT equipment as needed. Ability to work at desks, network closets, server rooms, and job sites or branch locations when required. May require occasional evening or weekend work for maintenance, upgrades, outages, or project work. May require participation in an on‑call rotation. Core Competencies Strong technical troubleshooting Customer service mindset Clear written and verbal communication Ownership and accountability Attention to detail Ability to prioritize and follow through Willingness to learn new technologies Team‑oriented approach #J-18808-Ljbffr RK Mechanical, Inc.