Senior Systems Administrator

Job summary

As a Senior Systems Administrator, you will ensure the reliability, security, and compliance of mission-critical Windows Active Directory environments while leading daily operations and executing security tasks.

Qualifications

• ACTIVE Top Secret (TS) security clearance at time of hire
• 5–10 years of hands-on Windows systems administration experience in AD environments
• Experience creating and troubleshooting GPOs and managing AD objects
• Experience applying STIG/SCAP scans and deploying Windows security patches
• Experience administering ACAS/Nessus vulnerability scanning and driving remediation
• Understanding of core services: DNS, DHCP, TCP/IP networking fundamentals
• Experience with backup/restore verification and capacity planning
• Proficiency with structured troubleshooting and customer-centered support

Responsibilities

• Perform support, troubleshooting, software updates, and helpdesk tasks for Windows endpoints and servers
• Create, apply, and troubleshoot GPOs; manage AD objects; enforce least-privilege access controls
• Plan and execute Windows security updates; run STIG/SCAP tools and security scans; track remediation
• Administer and operate ACAS/Nessus for vulnerability discovery and results triage
• Maintain backup software, verify restore procedures, and monitor datastore capacity
• Provide root-cause analysis for developers and technical users across OS, AD/GPO, network, and application layers
• Produce runbooks, SOPs, and configuration baselines; follow change management processes
• Implement controls under guidance of the ISSO/ISSM; prepare evidence for assessments and audits
• Operate across the corporate network and multiple enclaves, adhering to enclave-specific procedures
• Use PowerShell to automate workflows
• Administer RHEL/Rocky/Ubuntu servers and common services; support container hosts
• Partner with engineering to embed security in CI/CD and automate environment provisioning

Skills

Relocation