Senior Systems Administrator (DoD TS/SCI) - Windows & Linux

cFocus Software Incorporated; South Dakota; On-site; USD 110,000 - 150,000; Full time

Job summary

cFocus Software Incorporated seeks a Sr. System Administrator to support a United States Air Force program. The role is onsite at Ellsworth AFB, SD and requires TS/SCI SSBI clearance.

The candidate will manage enterprise Windows and Linux systems in high-availability environments, engineer Active Directory, perform capacity planning, and coordinate with multiple teams to ensure security and compliance across RMF and A&A processes.

Qualifications

• Active TS/SCI SSBI clearance required.
• B.S. in Computer Science, IT, or related field.
• 2+ years of Systems Administrator experience.
• Advanced Windows and Linux admin in high-availability environments.
• Active Directory engineering and privileged access management.
• Experience with enterprise virtualization and Nutanix.
• Configuration management, patching, and baseline control.
• Patch validation and production readiness processes.
• Backup, COOP, disaster recovery expertise.
• DoD RMF, A&A, and continuous monitoring familiarity.

Responsibilities

• Perform senior-level Windows and Linux systems administration for FMWF infrastructure and environments.
• Engineer, configure, and troubleshoot Active Directory, service accounts, and authentication dependencies.
• Conduct capacity planning, performance analysis, and Nutanix virtualization engineering.
• Monitor system health and implement corrective actions to ensure availability.
• Maintain configuration baselines and engineering records; ensure proper documentation.
• Engineer, test, validate, and deploy patches and security directives on schedule.
• Conduct vulnerability remediation without impacting availability.
• Assess proposed changes and validate post-deployment performance.
• Maintain controlled development/test environments and data support.
• Provide backup, restoration, and resilience support for development data.
• Support COOP, disaster recovery, and emergency maintenance activities.
• Provide Level III escalation with advanced diagnostics and root-cause analysis.
• Coordinate with DB2, WebSphere, cybersecurity, and Government stakeholders.
• Support cross-stack integration among infrastructure components and security tooling.
• Document changes, RMF evidence, and compliance-related artifacts.

Skills

TS/SCI clearance

Active Directory

Windows Admin

Linux Admin

Nutanix

RMF/DoD compliance

Disaster recovery

Education

B.S. Computer Science, Information Technology, or a related field

Job description

cFocus Software Incorporated seeks a Sr. System Administrator to support a United States Air Force program. The role is onsite at Ellsworth AFB, SD and requires TS/SCI SSBI clearance.

The candidate will manage enterprise Windows and Linux systems in high-availability environments, engineer Active Directory, perform capacity planning, and coordinate with multiple teams to ensure security and compliance across RMF and A&A processes.