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Systems Administrator - VMware & Virtualization | Top Secret w/SCI eligibility

American Systems Corporation

Arlington, VAFull-time$120–150K/yrPosted 1 day agoStill listed today

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At a glance

Compensation
$120–150K/yr
Location
Arlington, VA
Schedule
Full-time
Work Authorization
Not specified

Olive lists jobs from US employers, including remote roles you can work from the United States.

Requirements

Credentials this posting asks for.

CompTIA Security+ Certification, requiredTop Secret clearance, required

Job overview

American Systems seeks a senior systems administrator to support, maintain, secure, and optimize enterprise IT systems. The role administers network switches, virtualized platforms, servers, and cybersecurity controls, with a focus on VMware virtualization and network infrastructure. The position is on-site and requires an active Top Secret clearance with SCI eligibility, Security+ certification, and at least three years of relevant experience.

Skills & qualifications

RequiredNice to have

Skills

Systems Administration, requiredNetwork Administration, requiredCyber Infrastructure Support, requiredManaged Network Switches, requiredEnterprise Networking, requiredVMware vSphere, requiredWindows Server Administration, requiredActive Directory, requiredDNS, requiredDHCP, requiredGroup Policy, requiredCybersecurity Principles, requiredSystem Hardening, requiredPatching, requiredVulnerability Management, requiredSecure Access Controls, requiredNetwork Troubleshooting, requiredVirtualization Troubleshooting, requiredBackup and Recovery Tools, requiredMonitoring Platforms, requiredAutomation and Scripting, requiredAnalytical Skills, requiredTroubleshooting, requiredDocumentation, requiredIndependent Work, requiredCollaboration, requiredVMware ESXi, requiredvCenter, requiredVM Provisioning, requiredNetwork Switching and Routing, requiredVLANs, requiredSTP, requiredTrunking, requiredPort Security, requiredTCP/IP, requiredVPN, requiredSystem Monitoring, requiredLog Review, requiredPatch Management, requiredVulnerability Remediation, required

Qualifications

Active Top Secret Clearance With SCI Eligibility, requiredCompTIA Security+ Certification, required3+ Years Systems Administration Experience, requiredBachelor's in IT, Cybersecurity, Computer Science or Related Field or Equivalent, nice to haveNetwork+ Certification, nice to haveCCNA Certification, nice to haveVMware VCP Certification, nice to haveMicrosoft or Relevant Infrastructure Certifications, nice to have

Benefits

Medical Insurance
Paid Time Off
401(k) Match
Tuition Assistance

Full job description

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

  • 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.

Qualifications

  • 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

  • VMware ESXi, vCenter, VM provisioning and administration

  • Network fundamentals including network switching and routing, VLANs, STP, trunking, port security, TCP/IP, DNS, DHCP, and VPN

  • Windows Server administration

  • Active Directory and Group Policy

  • System monitoring and log review

  • Patch management and vulnerability remediation

  • Backup and disaster recovery

  • Cybersecurity best practices and secure configuration management

Soft Skills

  • Strong problem-solving and critical thinking

  • Clear written and verbal communication

  • Ability to prioritize and manage multiple tasks

  • Strong customer service and teamwork mindset

  • Attention to detail and commitment to secure operations

Helpful Addtional Qualifications

  • 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.

Work Environment

  • All work will take place on-site

  • 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 $120,000.00/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

How this job compares

Set against the 2,405 open Systems Administrator jobs on Olive Jobs, counted November 12, 2026.

Pay
  • This posting$120–150K/yr
  • Virginia median$98–158K/yr196 salary ranges
  • US median$94–148K/yr1,557 salary ranges

This range's midpoint, $135K, is 5% above the Virginia median midpoint ($129K) — in the middle half of Systems Administrator salary ranges in Virginia.

Openings
Olive Jobs lists 248 open Systems Administrator jobs in Virginia and 2,405 across the US. 5% of them nationwide are listed as remote or flexible.
Hiring the most in Virginia
Experience
This posting asks for at least 3 years of experience; Systems Administrator postings that state a minimum ask for 5 years at the median (1,997 postings).
Education
355 of the 2,405 open Systems Administrator jobs (15%) ask for a bachelor's degree or higher.

Counted across the open, public US postings on Olive Jobs on November 12, 2026. Pay medians are the middle values of the low ends and of the high ends of postings that list both ends of a range in the same cadence (a yearly salary or an hourly rate); a range's midpoint is halfway between its ends. Pay and experience figures resting on fewer than 20 postings are left out.

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