The Sr. Systems Administrator will manage daily operational requirements of computer network systems, including workstations, file servers, and virtual machines. Responsibilities include hardware/software installation, network security implementation (firewalls, anti-virus, intrusion detection), VMware/vSphere administration, virtualization troubleshooting (vCenter, ESXi, NSX, VSAN), container deployment, storage solutions, and disaster recovery planning. The role requires 5 years of systems administration experience, 3 years of network engineering with 2 years of cloud architecture, and proficiency in virtualization, networking, and security tools. An existing Top-Secret DoD security clearance and U.S. citizenship are required.