Systems Administrator (All Levels) — TS/SCI w/ FSP

Systems Administrator (All Levels) — TS/SCI w/ Full Scope Polygraph (FSP)Location: Linthicum, MD / Annapolis Junction, MD Work Model: 100% On-Site (classified environment; not remote)Clearance: Active TS/SCI with Full Scope Polygraph (FSP) required (must be active/current)Employment Type: ContractWe’re seeking Systems Administrators (multiple levels) to support mission-critical classified environments for a large DoD integrator. You’ll help design, deploy, secure, sustain, and troubleshoot Windows and/or Linux systems, often in virtualized (VMware) on-prem environments. Work includes partnering closely with network, security, software, and program teams to maintain high availability and compliance.Leveling note: This posting is intended to source multiple skill levels (Junior through Principal/SME). Final level/title aligns to experience and technical depth.What You’ll Do (Responsibilities may vary by level)Core Systems Administration (Windows and/or Linux):Administer and sustain Windows Server and/or Linux (RHEL) systems in a classified environment.Install, configure, harden, patch, and troubleshoot servers/workstations; monitor performance and reliability; resolve incidents and implement preventive fixes.Manage user and computer accounts, permissions, and access controls (e.g., AD, groups, file permissions, security ACLs).Support backup/recovery, storage/file systems, capacity planning, and routine maintenance (disk space, log maintenance, etc.).Virtualization / Infrastructure (as applicable):Administer VMware vSphere / ESXi / vCenter (provisioning, lifecycle, configuration, monitoring, troubleshooting).Support physical/virtual server environments and coordinate with adjacent infrastructure teams.Security & Compliance (classified/RMF environments):Follow strict Information Systems security procedures; maintain audit/logging and support security documentation as required.Implement and maintain DISA STIG configurations; coordinate remediation and document risk/mitigation items (e.g., POA&M support where applicable).Support system hardening and ongoing compliance aligned to RMF practices.Operations, Documentation, and Customer Support:Coordinate with network/software/system engineers, ISSM/ISSO partners, desktop teams, project managers, and end users to keep systems operating smoothly.Document procedures/SOPs, changes, and troubleshooting steps; communicate status to stakeholders.Evaluate and work with vendors on solutions, components, and issue resolution.Optional Specialized Responsibilities (based on need):Splunk administration (indexers/search heads/deployment servers, dashboards, SPL queries, onboarding data sources).Endpoint security tooling / monitoring (e.g., HBSS/Trellix), vulnerability scanning workflows, or automation/scripting.Required Qualifications (Baseline)Active TS/SCI with Full Scope Polygraph (FSP).Hands-on Systems Administration experience in Windows and/or Linux environments supporting production users/systems.Experience with at least one of the following, depending on alignment:Windows Server, Active Directory, Group PolicyRHEL/Linux administrationVMware (vSphere/ESXi/vCenter)Comfort working on-site in a classified environment (no remote).DoD 8570 / 8140-aligned baseline certification (commonly Security+ CE or equivalent), if required by the program.Preferred Qualifications (Add-ons that help you source wider skill mixes)Experience operating in environments requiring STIG compliance and security documentation support.Knowledge of basic networking concepts (subnets, routing, VLANs) and troubleshooting cross-team issues.Storage/SAN familiarity, system imaging/provisioning, and hardware install/refresh experience.Scripting/automation (PowerShell, Bash, Python) to reduce toil and standardize builds.Monitoring/logging tools exposure (Splunk, SolarWinds, etc.).