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: Contract

We'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 Top Secret Clearance /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 Policy
• RHEL/Linux administration
• VMware (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.).