System Administrator (Intermediate)

The Intermediate Systems Administrator provides critical systems engineering, administration, and cybersecurity support for a multi-platform computing environment supporting a Department of Defense (DoD) government contract. The successful candidate will join a cohesive technical team responsible for the effective provisioning, installation, configuration, maintenance, and secure operations of physical and virtual system hardware, operating systems (Windows and/or Linux), and associated infrastructure enclaves. This role demands a balance of robust technical skills, adherence to strict federal security compliance guidelines, and the ability to solve moderately complex technical issues independently while collaborating with Cybersecurity and Software Engineering teams.

Responsibilities

Install, configure, and maintain physical and virtual servers (Windows Server 2019/2022, Red Hat Enterprise Linux, Ubuntu) and enterprise workstations; Administer network services including Active Directory, Group Policy Objects, DNS, and DHCP; Maintain and optimize VMware ESXi environments, vCenter Server, and associated virtual infrastructure; Implement, test, and maintain data backup, disaster recovery, and system replication plans; Assist in managing network-attached storage (NAS) and storage area network (SAN) configurations; Review, assess, and patch vulnerabilities identified by automated scanning tools such as ACAS and Nessus; Apply DISA Security Technical Implementation Guides (STIGs) to ensure compliance with RMF and NIST SP 800-53 standards; Compile and maintain RMF-compliant documentation, system security plans, and configuration management logs; Implement and troubleshoot Public Key Infrastructure (PKI) and Single Sign-On (SSO) configurations; Develop administrative scripts using PowerShell, Bash, or Ansible; Provide configuration and basic troubleshooting support for enterprise switches, firewalls, and secure LAN connections; Manage customer requests and system projects via ticketing system such as ServiceNow; Deliver Tier II/III support, end-user training, and incident resolution for escalated helpdesk requests; Draft and maintain system administrator manuals, standard operating procedures (SOPs), and system architecture diagrams using Microsoft Visio

Requirements

Secret clearance (must have clearance to start); IAT Level II Baseline certification; Bachelor's Degree in Computer Science, Information Technology, Cybersecurity, or a related STEM field (appropriate experience accepted in lieu of degree); Minimum 5 years of relevant systems administration experience; Proven experience managing virtual environments (VMware ESXi, vSphere, or vCenter); Strong working knowledge of Windows Server administration, Active Directory, and GPOs; Hands-on experience administering Linux environments (RHEL or Ubuntu); Demonstrated experience with vulnerability scanners (ACAS, Nessus, SCAP Compliance Checker); Familiarity with patch management software (WSUS, Tanium, or Ansible)

Nice to have

Direct experience supporting US military and agency programs in Huntsville, AL; Experience with containerization technologies such as Red Hat OpenShift, Kubernetes, or Docker; Experience with Continuous Integration/Continuous Delivery (CI/CD) environments and tools (Gitlab, Ansible Automation, Jenkins, or Azure DevOps); Active Server certifications: Server+