• Design, deploy, configure, and maintain a large-scale VMware vSphere (ESXi & vCenter) infrastructure across multiple data center clusters. • Manage vSphere high-availability (HA), Distributed Resource Scheduler (DRS), and vMotion configurations. • Implement and manage disaster recovery (DR) solutions using VMware SRM and vSphere Replication. • Perform capacity planning, performance monitoring, and resource optimization for all VMware clusters. • Perform analysis of alternatives to include Microsoft Hyper-V clusters, including SCVMM, Oracle VM (OVM), and Red Hat Virtualization (RHV) platforms, planning for interoperability and stability. • Serve as a senior escalation point for all virtualization-related incidents, performing root cause analysis and implementing corrective actions. • Conduct regular patching, updates, and security hardening of all hypervisor hosts and management systems in accordance with NIST and FISMA guidelines. • Collaborate with storage, networking, and application teams to provision resources and troubleshoot complex, multi-tiered application issues. • Develop and maintain comprehensive system documentation, standard operating procedures (SOPs), and infrastructure diagrams. • Automate routine tasks using scripting tools such as PowerShell, PowerCLI, or Ansible. • Participate in an on-call rotation for 24/7/365 operational support.