Systems Administrator - VMware & Virtualization | Top Secret w/SCI eligibility
American Systems · Arlington, VA, US
About this role
## Overview American Systems is seeking a **Sr. Systems Administrator** with strong experience in **network infrastructure, switching, and VMware virtualization** to support, maintain, secure, and optimize enterprise IT systems. This role administers core infrastructure environments, including **network switches, virtualized platforms, server systems, and cybersecurity controls**. A **security-first mindset** and hands-on systems administration expertise are essential. --- ## Responsibilities - Administer, maintain, and troubleshoot enterprise IT infrastructure (servers, virtual environments, and network systems) - Configure, manage, and support network switches, including **VLANs, trunking, port security**, and related network services - Monitor and maintain **LAN/WAN connectivity**, network performance, and infrastructure availability - Deploy, administer, and support **VMware environments** (ESXi hosts, vCenter, VMs, storage connectivity, snapshots, patching, performance tuning) - Implement and maintain secure system configurations aligned with company cybersecurity policies and best practices - Perform system hardening, patch management, vulnerability remediation, and access control administration - Support **firewall, VPN, endpoint protection, and network access controls** as needed - Manage **Active Directory, Group Policy, DNS, DHCP**, and other core infrastructure services - Respond to system alerts/outages; perform root cause analysis and document corrective actions - Support **backup, disaster recovery, and business continuity** for critical systems - Maintain system documentation, network diagrams, SOPs, and asset inventories - Assist with audits, compliance activities, and security assessments - Collaborate with IT, cybersecurity, and business teams on upgrades, deployments, and operational improvements - Recommend improvements to system performance, reliability, and security posture --- ## Qualifications - **Active Top Secret clearance with SCI eligibility** - **CompTIA Security+** - **3+ years** experience in systems administration, network administration, or cyber infrastructure support - Hands-on experience with managed network switches and enterprise networking concepts - Strong experience with **VMware vSphere** (ESXi and vCenter administration) - Experience with **Windows Server** and core services: Active Directory, DNS, DHCP, Group Policy - Understanding of cybersecurity principles: hardening, patching, vulnerability management, secure access controls - Experience troubleshooting network connectivity, switching, and virtualization issues - Familiarity with backup/recovery tools, monitoring platforms, and automation/scripting - Strong analytical, troubleshooting, and documentation skills - Ability to work independently and collaboratively in a fast-paced environment --- ## Technical Skills (Examples) - **VMware:** ESXi, vCenter, VM provisioning/administration - **Networking:** switching/routing, VLANs, STP, trunking, port security, TCP/IP, DNS, DHCP, VPN - **Windows Server:** Active Directory, Group Policy - System monitoring/log review - Patch management & vulnerability remediation - Backup & disaster recovery - Cybersecurity best practices & secure configuration management --- ## Helpful Additional Qualifications - Experience with **Cisco, Dell, Aruba, Juniper**, or similar enterprise switching platforms - Bachelor’s degree in IT/Cybersecurity/Computer Science (or equivalent experience) - Certifications su
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