Systems Administrator III, Domain & Server

AMERICAN SYSTEMS

Systems Administrator III managing enterprise IT infrastructure at AMERICAN SYSTEMS. Overseeing critical systems like Active Directory and Exchange Server with a focus on performance and security.

Posted 5/28/2026full-timeManassas • Virginia • 🇺🇸 United StatesMid-LevelSenior💰 $93,900 - $156,800 per yearWebsite

Tech Stack

Tools & technologies

AnsibleAWSAzureCloudDNSGoogle Cloud PlatformLinuxSplunkTerraformVMware

About the role

Key responsibilities & impact

responsible for the comprehensive administration, maintenance, and optimization of enterprise IT infrastructure, including Microsoft Server environments and domain services.
managing critical systems such as Active Directory, Exchange Server, DNS, and DHCP services.
overseeing both Linux and Windows server environments to ensure optimal performance, security, and availability.
responsible for system monitoring, troubleshooting complex technical issues, implementing security protocols.
managing user accounts and permissions, and collaborating with cross-functional teams to support organizational technology needs.
administering and maintaining Windows and Linux servers, ensuring high availability and performance.
managing the deployment, configuration, and maintenance of operating systems, applications, and patch management processes.
supporting virtualization environments (e.g., NUTANIX) to optimize resource utilization.
implementing security measures, including access control, system hardening, and vulnerability remediation.
managing storage solutions (SAN, NAS) and ensuring effective backup and recovery operations.
assisting in system upgrades, migrations, and disaster recovery planning and execution.
developing and updating documentation for system configurations, procedures, and troubleshooting.
troubleshooting complex system issues and responding to incidents to ensure timely resolution.
collaborating with cross-functional teams, including network, security, and application teams, to enhance overall infrastructure.
contributing technical expertise to the design and implementation of new systems and infrastructure enhancements.

Requirements

What you’ll need

Minimum of 5 years of experience in systems administration
Must hold a current 8570/8140 IAT Level II Certification (CCNA Security, CySA+, GICSP, GSEC, Security+ CE, CND, SSCP)
Advanced technical expertise in server administration, domain management, and infrastructure planning
Proficiency in managing Active Directory, DNS, DHCP, and Group Policy in large-scale environments.
Strong experience with virtualization technologies such as VMware, Hyper-V, or similar platforms.
Skilled in storage management, including SAN and NAS solutions, and backup/recovery operations.
Familiarity with cloud platforms (AWS, Azure, or GCP) and hybrid cloud environments.
Experience with automation tools like PowerShell, Ansible, or Terraform for system configuration and management.
Experience with monitoring tools such as Splunk for system performance monitoring.
Experience with Git for version control.
Knowledge of security frameworks, including NIST, FISMA, or DISA STIG compliance.
Must be able to work independently while managing multiple priorities in a fast-paced enterprise environment.
Excellent troubleshooting skills with a focus on diagnosing and resolving complex system issues.
Strong communication skills and the ability to work effectively in a team-oriented environment.

Benefits

Comp & perks

healthcare benefits
paid leave
retirement plans
insurance programs
education and training assistance

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

systems administrationserver administrationdomain managementinfrastructure planningActive DirectoryDNSDHCPGroup Policyvirtualizationstorage management

Soft Skills

troubleshootingcommunicationcollaborationindependencetime management

Certifications

8570/8140 IAT Level II CertificationCCNA SecurityCySA+GICSPGSECSecurity+ CECNDSSCP