Systems Administrator III

Arcfield is seeking an Systems Administrator III to provide support to computer systems and network infrastructure in a secure systems mission architecture. The qualified candidate will provide design, maintenance, sustainment, and enhancement support for the architecture in a classified and unclassified environment; ensure compliance with applicable information assurance requirements; and create and update relevant system documents.  

• Install, configure, and maintain Windows (Windows 11, Server 2019, or 2025) and Linux (Ubuntu, Red Hat Linux, CentOS) servers, desktops, and all network devices in accordance with all NIST 800-53A r4 and DISA STIG and SRG requirements. 

• Evaluate and gain comprehension of new technologies to assist with new requirement implementation efforts. 

• Use log aggregation technologies allowing for the collection and filtering of system logs and audit trails. 

• Support software development environments that utilize commercial, GOTS, and custom tooling. 

• Perform hardware/software installation and integration, and general infrastructure support. 

• Prepare documentation related to system configurations and baselines. 

• Provide backup and recovery services; manage file systems and disk space. 

• Configure desktop and server virtualization within VMware vSphere and EXSi. 

• Provide daily, on-site support for the operations/maintenance of information systems deployments in an air-gapped environment. 

• Understand information systems architecture, perform installation and STIG hardening of Operating Systems; maintain within and across multiple classification levels. 

• Configure and execute vulnerability scanning tools (Nessus), SCAP/STIG scans (SCC Tool, OpenSCAP, evaluateSTIG, etc.), and perform remediating steps based on findings. 

• Administer Windows and Red Hat Linux in an offline or standalone environment. 

• Perform User account and access control management (Active Directory, LDAP, User Access Control) in a domain or stand-alone environment. 

• Perform proper marking, handling, and storage of classified materials. 
• Additional duites as assigned.
• 25% Travel will be required.

• Bachelor’s degree in computer science, Information Systems Management, Network Engineering, or closely related discipline plus 5-7 years of experience, MS plus 3-5 years of experience, PhD plus 0-2 years of experience  

• Must possess a Secret Clearance 

• A minimum of two (2) years of experience as a System Administrator. 

• DoD Directive 8570 / 8140 Information Assurance Technical (IAT) Level II certification (e.g., Security+ CE, CCNA Security, CySA+, GICSP, GSEC, CND, SSCP). 

We are an equal opportunity employer and federal government contractor. We do not discriminate against any employee or applicant for employment as protected by law.