Systems Administrator

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 a
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.

• 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.

• 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.

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 Power Shell, 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…