Senior Systems Administrator

Koniag Government Services, LLC•Winchester, VA

15d•$160,000 - $185,000•Onsite

About The Position

Arlluk Technology Solutions, LLC, a Koniag Government Services company, is seeking a Senior Systems Administrator with an active Top Secret security clearance to support ATS and a government customer in Winchester, Virginia. The role administers and maintains a hybrid infrastructure of Windows and Linux servers, end-user workstations, AWS cloud resources, VMware virtualization, networking components, storage systems, databases, and business applications. The administrator supports approximately 135 servers and desktop systems across cloud-hosted and on-premises environments. This hands-on role focuses on Windows Server administration, Active Directory and Group Policy, PowerShell automation, Linux support, VMware, AWS networking, and basic SQL Server administration. The administrator diagnoses and documents issues across infrastructure and application layers, collaborates with technical teams, and may support future migrations between cloud-hosted and on-premises environments. The position is fully on-site and may require occasional work outside normal business hours for maintenance, patching, deployments, outages, or incident response.

Requirements

Minimum 5 years of experience in systems administration, infrastructure support, or a closely related technical environment.
Strong professional experience administering Microsoft Windows Server environments, including Active Directory, Group Policy, user and system management, and enterprise desktop support.
Demonstrated experience with PowerShell scripting and automation for system administration, application deployment, patching, and configuration management.
Experience deploying applications and configuration changes to servers and desktop systems through automated PowerShell processes.
Working knowledge of Linux administration, including package installation, configuration-file management, service administration, and command-line troubleshooting.
Experience supporting desktop computers, physical servers, storage systems, and associated network infrastructure.
Experience administering VMware vSphere, VMware ESXi, and VMware vCenter environments, including creating VM templates and deploying and maintaining virtual machines.
Experience creating and maintaining custom Windows images using MDT and WDS, and performing bare-metal Windows desktop deployments.
Working knowledge of AWS networking and infrastructure concepts, including security groups, network access control lists, route tables, subnets, and application connectivity.
Basic knowledge of Microsoft SQL Server installation, configuration, administration, and querying.
Strong troubleshooting skills and ability to isolate performance and availability issues across multiple technology layers.
Ability to independently research unfamiliar issues, learn new technologies, and develop practical solutions.
Ability to manage multiple priorities, resolve technical issues independently, and meet competing operational and project deadlines.
Ability to collaborate with infrastructure, application, security, database, and other technical teams.
Strong verbal, written, organizational, and technical documentation skills; ability to communicate technical issues to technical and nontechnical stakeholders.
Ability and willingness to take ownership of technical challenges and work hands-on across a diverse hybrid infrastructure environment.
Active Top Secret security clearance.

Nice To Haves

Experience supporting Docker containers and containerized applications.
Experience administering MongoDB on Linux.
Python scripting or automation experience.
Experience supporting SAN technologies and enterprise storage platforms.
Experience supporting hybrid cloud environments that include AWS and on-premises infrastructure.
Experience planning or supporting cloud-to-on-premises or on-premises-to-cloud migrations.
Familiarity with monitoring tools, log analysis, capacity planning, and system performance tuning.
Experience coordinating across infrastructure, networking, database, application, and security teams.

Responsibilities

Administer Windows Server environments, including Active Directory, Group Policy, DNS, accounts, security groups, permissions, and related enterprise services.
Manage configuration, patching, and ongoing support for approximately 135 servers and desktop systems.
Develop and maintain PowerShell scripts for application deployment, system configuration, patching, administration, and task automation.
Install and update software across server and desktop environments using PowerShell-based deployment methods.
Support Linux systems by installing RPM packages, modifying configuration files, managing services, reviewing logs, and troubleshooting.
Assist with configuration and support of Docker-based applications and environments.
Perform basic installation, configuration, maintenance, and troubleshooting of Microsoft SQL Server; execute basic SQL queries and assist with database-related application troubleshooting.
Provide basic support for MongoDB environments hosted on Linux when required.
Support physical and virtual infrastructure, including desktops, servers, storage area networks, and associated network components.
Maintain a VMware environment consisting of a three-node cluster and VMware vCenter; create and maintain VM templates, deploy VMs, and patch and manage VMware vSphere.
Build and maintain custom Windows desktop images using Microsoft Deployment Toolkit and Windows Deployment Services; perform bare-metal desktop imaging and deployment.
Support AWS infrastructure and troubleshoot application connectivity within and outside AWS.
Review and modify AWS security groups, network access control lists, routing tables, and related network configurations.
Assist with automating AWS administrative and operational tasks using Python or other scripting tools.
Diagnose system and application performance problems and identify issues originating in network, hardware, operating system, database, virtualization, cloud, or application layers.
Document system configurations, administrative procedures, deployment processes, troubleshooting activities, and environment changes.
Collaborate with application developers, database administrators, network engineers, security personnel, and other technical stakeholders.
Support infrastructure changes, including potential migrations between cloud-hosted and on-premises environments.
Participate in after-hours maintenance, patching, deployments, and incident response when necessary.