Provides Tier 3 escalation support for complex infrastructure, systems, and network issues. Maintains and improves Windows Server, Active Directory, Azure, Intune, endpoint, virtualization, and network environments. Designs and deploys infrastructure solutions, manages firewalls, routers, switches, VLANs, VPNs, monitoring, patching, and hybrid cloud systems. Supports business applications, leads infrastructure projects, documents systems, applies security best practices, and mentors Tier 1 and Tier 2 technicians.