Senior System Administrator (SA) – Skill Level 3
Requisition: SADM3
Required Clearance: Active TS/SCI with Full Scope Polygraph
Wyetech is seeking an experienced Senior System Administrator (SA3) to support the administration, configuration, maintenance, troubleshooting, and modernization of mission-critical Information Technology (IT) systems within complex Department of Defense (DoD) and Intelligence Community environments.
The successful candidate will join a large, integrated team of Government civilian and contractor System Administrators, Systems Engineers, and Network Engineers responsible for supporting both DevOps development environments and live operational systems.
The team manages Linux and Windows infrastructure, including physical servers and virtual machines, across three backend environments operating at different classification levels. These environments support mission and operations personnel and require reliable authentication services, Domain Name System (DNS) functionality, shared storage, home directories, and secure communication between systems and users.
The Senior System Administrator will provide hands-on technical support for daily operations, system monitoring, incident resolution, security compliance, storage management, virtualization, and infrastructure sustainment. The position requires strong troubleshooting capabilities, familiarity with secure enterprise environments, and the ability to coordinate effectively with technical teams across multiple contracts under direct Government leadership.
The ideal candidate will possess extensive Linux administration experience, a strong understanding of secure system configurations and DISA STIG requirements, and experience supporting enterprise infrastructure in demanding operational environments.
Required Skills/Experience
Active TS/SCI clearance with Full Scope Polygraph.
Extensive Linux System Administration experience meeting the qualifications for the System Administrator Level 3 labor category.
Experience administering, configuring, maintaining, and troubleshooting Linux operating systems within complex enterprise environments.
Experience supporting Windows systems and integrating Windows and Linux infrastructure.
Demonstrated experience supporting STE/STN requirements and secure system configurations.
Hands-on experience implementing, validating, and maintaining Defense Information Systems Agency (DISA) Security Technical Implementation Guide (STIG) compliance on Linux systems.
Experience identifying configuration deficiencies, implementing security remediation, and maintaining system compliance with applicable security requirements.
Experience administering and troubleshooting physical servers and virtual machines.
Experience managing enterprise storage infrastructure, including CFS/DFS, NetApp, or comparable storage technologies.
Experience administering virtualization platforms such as Proxmox, Red Hat Kernel-based Virtual Machine (KVM), VMware, or comparable technologies.
Working knowledge of IP networking, network protocols, routing, connectivity, and firewall configurations.
Experience diagnosing and resolving network-related issues affecting server connectivity, system communications, and enterprise services.
Experience supporting authentication services, DNS, shared drives, home directories, and associated enterprise infrastructure.
Experience supporting IT systems across multiple environments with differing security classification requirements.
Familiarity with container technologies and cloud-based infrastructure environments.
Experience monitoring enterprise systems, identifying operational issues, and resolving technical incidents.
Experience managing and resolving support requests through ticketing systems such as Jira.
Experience supporting DevOps environments and operational production systems.
Experience performing system installation, configuration, upgrades, patching, maintenance, and performance optimization.
Ability to…