Administers and improves credit union infrastructure across networks, servers, storage, cloud, virtualization, telecommunications, security, and disaster recovery. Manages Active Directory, DNS, DHCP, VPNs, firewalls, monitoring, backups, patching, and high-availability systems. Troubleshoots complex infrastructure issues, provides Tier II/III support, maintains documentation and compliance, coordinates vendors, supports audits, and participates in on-call rotations, planning, procurement, and technology improvement initiatives.