Summary: The Senior Systems Administrator is responsible for the administration, security, reliability, and continuous improvement of enterprise identity and infrastructure services, with strong hands-on expertise in Active Directory, Microsoft Entra ID, SSO application integrations, ADFS, DNS, DHCP, and PKI/certificate services. Working understanding of adjacent infrastructure technologies, including VMware, Azure Local, Rubrik, Dell infrastructure, and Zerto, enabling effective troubleshooting and collaboration across infrastructure, cloud, security, and application teams.