Senior Systems Administrator: Domain & Server Expert

American Systems; California; On-site; USD 82,000 - 131,000; Full time

Benefits offered by this job

Healthcare benefits

Education & training assistance

Paid leave

Job summary

American Systems is hiring a Systems Administrator III (Domain & Server) to oversee enterprise IT infrastructure, including Windows and Linux servers, Active Directory, DNS, DHCP, and virtualization platforms. The role emphasizes security, compliance, backup/recovery, and cross-team collaboration in a fast-paced environment.

Applicants must be a U.S. citizen with an active Secret clearance or eligibility for Top Secret/SCI, plus 5+ years of experience and IAT Level II certification.

Qualifications

• U.S. Citizenship is required.
• Active Secret clearance with ability to obtain Top Secret with SCI eligibility or Top Secret with SCI eligibility.
• Minimum 5 years in systems administration (Windows and Linux).
• Current 8570/8140 IAT Level II Certification (CCNA Security, CySA+, GICSP, GSEC, Security+ CE, CND, SSCP).
• Strong experience in AD/DNS/DHCP and Group Policy in large environments.

Responsibilities

• Administer and maintain Windows and Linux servers for high availability.
• Deploy, configure, and patch operating systems and applications.
• Support virtualization environments (VMware, Hyper-V).
• Implement security measures and system hardening; address vulnerabilities.
• Manage storage (SAN/NAS) and ensure backups/recovery.
• Assist upgrades, migrations, and disaster recovery planning.
• Document system configurations and procedures; maintain runbooks.
• Troubleshoot complex issues and respond to incidents promptly.
• Collaborate with network, security, and application teams.
• Contribute to design and implementation of new systems.

Skills

Windows & Linux administration

Active Directory management

Virtualization

Security & compliance

Automation scripting

Documentation & teamwork

Tools

VMware

Hyper-V

Cloud platforms (AWS/Azure/GCP)

Storage management (SAN/NAS)

IAT Level II certification (CCNA Security, CySA+, etc)

Job description

American Systems is hiring a Systems Administrator III (Domain & Server) to oversee enterprise IT infrastructure, including Windows and Linux servers, Active Directory, DNS, DHCP, and virtualization platforms. The role emphasizes security, compliance, backup/recovery, and cross-team collaboration in a fast-paced environment.

Applicants must be a U.S. citizen with an active Secret clearance or eligibility for Top Secret/SCI, plus 5+ years of experience and IAT Level II certification.