Key Responsibilities (Principal Duties and Accountabilities *Essential Functions) Infrastructure and operations Own the Microsoft 365 GCC High tenant: Entra ID, Exchange Online, SharePoint/OneDrive, Teams, Intune, Defender, Purview, and licensing. The IT Manager runs NTS corporate IT day to day: infrastructure, endpoints, identity, collaboration tools, business systems, and the technical controls behind our CMMC Level 2 / NIST SP 800-171 program.