Systems Administrator – VMware, Virtualization

AMERICAN SYSTEMS

. Administer, maintain, and troubleshoot enterprise IT infrastructure, including servers, virtual environments, and network systems .

Posted 11/11/2026full-timeArlington • Virginia • United StatesMid-LevelSenior💰 $120,000 - $150,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in administering and maintaining enterprise IT infrastructure, including VMware environments, network systems, and cybersecurity practices. Proficient in troubleshooting, system hardening, and ensuring compliance in regulated environments.

Highest-signal resume keywords

Active Top Secret ClearanceCompTIA Security+ CertificationVMware vSphere AdministrationWindows Server AdministrationNetwork Administration

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Systems AdministrationNetwork AdministrationCyber Infrastructure SupportSystem HardeningPatchingVulnerability ManagementTroubleshootingBackup and RecoveryAutomation/ScriptingDocumentation

Soft Skills

Analytical SkillsTroubleshooting SkillsCollaborationIndependent WorkFast-Paced Environment Adaptability

Tools & Technologies

VMware ESXiVCenterActive DirectoryDNSDHCPCisco SwitchingDell SwitchingAruba SwitchingJuniper SwitchingFirewall Tools

Certifications & Qualifications

CompTIA Security+Network+CCNAVMware VCPMicrosoft Certifications

Industry Keywords

Cybersecurity PrinciplesCompliance ActivitiesRegulated EnvironmentsInfrastructure ServicesNetwork Performance

Tech Stack

Tools & technologies

Cyber SecurityDNSFirewallsPythonSwitchingVMware

About the role

Key responsibilities & impact

Administer, maintain, and troubleshoot enterprise IT infrastructure, including servers, virtual environments, and network systems
Configure, manage, and support network switches, 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, including ESXi hosts, vCenter, virtual machines, storage connectivity, snapshots, patching, and performance tuning
Implement and maintain secure system configurations in accordance 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 policies, DNS, DHCP, and other core infrastructure services
Respond to system alerts and outages; conduct root cause analysis and document corrective actions
Support backup, disaster recovery, and business continuity processes for critical systems
Maintain system documentation, network diagrams, standard operating procedures, and asset inventories
Assist with audits, compliance activities, and security assessments
Collaborate with IT, cybersecurity, and business teams on infrastructure upgrades, deployments, and operational improvements
Recommend improvements to system performance, reliability, and security posture
May occasionally require after-hours support for system maintenance

Requirements

What you’ll need

Active Top Secret clearance with SCI eligibility
CompTIA Security+ certification
3+ years of 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, including ESXi and vCenter administration
Experience with Windows Server administration and core services such as Active Directory, DNS, DHCP, and Group Policy
Understanding of cybersecurity principles, system hardening, patching, vulnerability management, and secure access controls
Experience troubleshooting network connectivity, switching, and virtualization issues
Familiarity with backup and recovery tools, monitoring platforms, and automation/scripting
Strong analytical, troubleshooting, and documentation skills
Ability to work independently and collaboratively in a fast-paced environment
Bachelor’s degree in Information Technology, Cybersecurity, Computer Science, or related field preferred; or equivalent combination of education and experience
Experience with Cisco, Dell, Aruba, Juniper, or similar enterprise switching platforms
Industry certifications such as Network+, CCNA, VMware VCP, Microsoft, or other relevant infrastructure certifications
Experience with firewalls, IDS/IPS, SIEM, or endpoint detection and response tools
Familiarity with scripting or automation using PowerShell, Python, or similar tools
Experience supporting regulated or compliance-driven environments

Benefits

Comp & perks

Healthcare benefits
Paid leave
Retirement plans
Insurance programs
Education and training assistance