System Administrator III - Windows/macOS

About the Opportunity

The Systems Administrator - Windows/macOS is responsible for administering, securing, and optimizing both enterprise Windows Server and macOS environments across physical, virtual, and cloud-connected infrastructures in a remote and on-site work environment. This dual-platform role manages core Microsoft technologies (Active Directory, Group Policy, DNS, DHCP, Microsoft Entra ID) alongside macOS device administration, identity integration, and mobile device management (MDM) platforms.

Success in this role is demonstrated by maintaining secure and highly available systems across both operating systems, effectively resolving complex technical issues, implementing automation and security improvements, ensuring compliance with federal requirements, and supporting mission objectives through collaboration.

What You Will Do in This Role

The System Administrator III - Windows/macOS administers and secures enterprise Windows and macOS environments, supporting identity, infrastructure, cloud, and endpoint systems while ensuring federal compliance, automation, vulnerability management, troubleshooting, and cross-functional IT operations.

• Administer, configure, maintain, and optimize enterprise Windows Server and macOS environments across physical, virtual, and cloud-connected systems. Manage identity and infrastructure services including Active Directory, Group Policy, DNS, DHCP, Microsoft Entra ID, and MDM platforms (Jamf Pro, BigFix, MECM, ManageEngine, Intune).
• Develop and maintain OS standards, security configurations, device management policies, and enterprise architecture for Windows and Apple systems.
• Implement federal security requirements (RMF, DISA STIGs), including patching, access controls, vulnerability remediation, and DoD CAC authentication.
• Support endpoint lifecycle management and cloud/virtual environments, including device deployment and administration across VMware, Hyper-V, Azure, and AW...