Systems Administrator

AMERICAN SYSTEMS; Arlington (VA); On-site; USD 110,000 - 130,000; Full time

Benefits offered by this job

On-site work

Job summary

AMERICAN SYSTEMS is a federal contractor seeking a Systems Administrator with strong experience in network infrastructure, switching, and VMware virtualization to support, maintain, secure, and optimize enterprise IT systems. The role requires hands-on administration of core infrastructure, including network switches, VLANs, VMware ESXi/vCenter, and cybersecurity controls.

The candidate will manage Active Directory, DNS, DHCP, and group policies, perform patch management and vulnerability

Qualifications

• 3+ years of systems or network administration experience.
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Responsibilities

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

Skills

Network infrastructure

Network switches

VMware vSphere

Active Directory

DNS/DHCP

Patch management

Vulnerability remediation

Scripting (PowerShell/Python)

Security policies

Troubleshooting

Education

Bachelor’s degree in Information Technology, Cybersecurity, Computer Science, or related field

Industry certifications: Network+, CCNA, VMware VCP

Tools

VMware ESXi

vCenter

Windows Server

Active Directory

DNS/DHCP servers

Job description

Overview

AMERICAN SYSTEMS is an employee-owned federal government contractor supporting national priority programs through our strategic solutions in the areas of Information Technology, Test & Evaluation, Program Mission Support, Engineering & Analysis, and Training.

JOB SUMMARY:

American Systems is seeking aSystems Administratorwith strong experience innetwork infrastructure, switching, and VMware virtualizationto 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 supportnetwork switches, VLANs, trunking, port security, and related network services.
• Monitor and maintainLAN/WAN connectivity, network performance, and infrastructure availability.
• Deploy, administer and supportVMware 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 withmanaged network switchesand enterprise networking concepts.
• Strong experience withVMware 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.

Preferred 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.

Technical Skills

• Network switching and routing fundamentals
• VLANs, STP, trunking, port security
• TCP/IP, DNS, DHCP, VPN
• VMware ESXi, vCenter, VM provisioning and administration
• 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

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 $110,000.00/Yr. - USD $130,000/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