Senior System Administrator (Windows/Linux)

TL;DR

Senior System Administrator (Windows/Linux): Administering and engineering mission-critical United States Air Force infrastructure with an accent on enterprise Windows and Linux systems, Active Directory, virtualization, and cybersecurity compliance. Focus on designing resilient infrastructure, solving complex availability and performance issues, and validating secure changes across controlled environments.

Location: Onsite in Ellsworth, South Dakota, primarily at Ellsworth AFB; rare work may be required at Wright-Patterson AFB or a contractor facility. Work is performed during the PWS duty-hour window.

Company

hirify.global provides software and technical services for government and mission-critical programs.

What you will do

• Administer, engineer, configure, and troubleshoot Windows and Linux systems supporting Air Force mission environments.
• Manage Active Directory, service accounts, authentication dependencies, permissions, virtualization, and Nutanix infrastructure.
• Perform performance analysis, capacity planning, system monitoring, root cause engineering, and Level III technical escalation support.
• Engineer, test, validate, and deploy patches, security directives, configuration changes, and vulnerability remediation.
• Support backups, recovery, resilience, continuity of operations, disaster recovery, and emergency maintenance.
• Coordinate cross-stack infrastructure activities with database, middleware, application, cybersecurity, and government stakeholders while maintaining technical documentation.

Requirements

• Active TS/SCI SSBI clearance required.
• Bachelor's degree in Computer Science, Information Technology, or a related field.
• 10+ years of systems administration experience in high-availability, mission-critical environments.
• Advanced experience with Windows, Linux, Active Directory, enterprise virtualization, configuration management, patch engineering, monitoring, backup, and disaster recovery.
• Working knowledge of RMF, Assessment and Authorization, security control implementation, continuous monitoring, and DoD/Air Force cybersecurity compliance.
• DoD 8570 IAT Level II and DoD 8140 System Administrator 451-Intermediate certifications required.

Culture & Benefits

• Work on a United States Air Force financial cybersecurity program.
• Collaborate with infrastructure, database, middleware, application, cybersecurity, program-management, and government teams.
• Follow controlled engineering, change-management, technical review, quality-control, and access-control processes.
• Support mission-essential systems where availability, resilience, security, and configuration integrity are critical.