Administers and troubleshoots Windows Server, Microsoft 365, identity, networking, virtualization, storage, backup, cloud, and security infrastructure. Monitors system performance, manages patching and lifecycle updates, supports disaster recovery, resolves escalated incidents, maintains documentation, coordinates with vendors, and participates in infrastructure upgrades, migrations, deployments, and technology projects. Provides support across offices, data centers, cloud environments, and remote locations, including occasional travel and after-hours maintenance or on-call support.