Systems Administrator - VMware & Virtualization | Top Secret w/SCI eligibility
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Before you apply
Salary$110k – $130k
LocationArlington, VA, US
Work modeon-site
Typefull-time
SenioritySenior
Experience3+ yrs
DepartmentIT / Cyber Security / Network Systems
Company size1,001–5,000 people
PostedAug 26, 2026 · 2mo ago
Verified live5h ago
At a glanceSummarised by Seekless from the posting.
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
Experience with Cisco, Dell, Aruba, Juniper, or similar enterprise switching platforms
Bachelor's degree in Information Technology, Cybersecurity, Computer Science, or related field preferred; or equivalent combination of education and experience
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
Skills
VMware
VMware vSphere
ESXi
vCenter
Active Directory
DNS
DHCP
Group Policy
Cisco
Dell
Aruba
Juniper
PowerShell
Python
SIEM
IDS/IPS
Firewalls
VPN
TCP/IP
VLAN
STP
Windows Server
Benefits
Healthcare benefits
Paid leave
Retirement plans
Insurance programs
Education and training assistance
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 is responsible for administering core infrastructure environments, including network switches, virtualized platforms, server systems, and cybersecurity controls. The ideal candidate combines hands-on systems administration expertise with strong networking knowledge and a security-first mindset.
Responsibilities
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Administer, maintain, and troubleshoot enterprise IT infrastructure, including servers, virtual environments, and network systems.
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Configure, manage, and support network switches, VLANs, trunking, port security, and related network services.
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Monitor and maintain LAN/WAN connectivity, network performance, and infrastructure availability.
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Deploy, administer and support VMware environments, including ESXi hosts, vCenter, virtual machines, storage connectivity, snapshots, patching, and performance tuning.
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Implement and maintain secure system configurations in accordance with company cybersecurity policies and best practices.
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Perform system hardening, patch management, vulnerability remediation, and access control administration.
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Support firewall, VPN, endpoint protection, and network access controls as needed.
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Manage Active Directory, group policies, DNS, DHCP, and other core infrastructure services.
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Respond to system alerts and outages; conduct root cause analysis and document corrective actions.
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Support backup, disaster recovery, and business continuity processes for critical systems.
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Maintain system documentation, network diagrams, standard operating procedures, and asset inventories.
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Assist with audits, compliance activities, and security assessments.
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Collaborate with IT, cybersecurity, and business teams on infrastructure upgrades, deployments, and operational improvements.
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Recommend improvements to system performance, reliability, and security posture.
Qualifications
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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.
Technical Skills
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VMware ESXi, vCenter, VM provisioning and administration
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Network fundamentals including network switching and routing, VLANs, STP, trunking, port security, TCP/IP, DNS, DHCP, and VPN
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Windows Server administration
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Active Directory and Group Policy
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System monitoring and log review
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Patch management and vulnerability remediation
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Backup and disaster recovery
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Cybersecurity best practices and secure configuration management
Soft Skills
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Strong problem-solving and critical thinking
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Clear written and verbal communication
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Ability to prioritize and manage multiple tasks
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Strong customer service and teamwork mindset
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Attention to detail and commitment to secure operations
Preferred Qualifications
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Experience with Cisco, Dell, Aruba, Juniper, or similar enterprise switching platforms.
•
Bachelor’s degree in Information Technology, Cybersecurity, Computer Science, or related field preferred; or equivalent combination of education and experience.
•
Industry certifications such as:
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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.
Work Environment
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All work will take place on-site
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May occasionally require after-hours support for system maintenance
Pay Transparency Statement
AMERICAN SYSTEMS is committed to pay transparency for our applicants and employee-owners. The salary range for this position is USD $110,000.00/Yr. - USD $150,000/Yr. Actual compensation will be determined based on several factors permitted by law. AMERICAN SYSTEMS provides for the welfare of its employees and their dependents through a comprehensive benefits program by offering healthcare benefits, paid leave, retirement plans, insurance programs, and education and training assistance.
EEO Statement
EEO Race/Sex/Disability Status/Veteran Status