Senior Linux/Unix Administrator

Job Title: Senior Linux/Unix Administrator

Work Location: USSTRATCOM Offutt AFB

Clearance: TS/SCI

Education: Bachelor's degree in a related field; equivalent work experience may be substituted in lieu of a degree

Experience: 8+ years

Certification: Cloud+ or GICSP or SSCP or Security+ or GSEC

Schedule: Monday - Friday day shift

Travel: Occasional

Salary: Commensurate with experience

Job Listing Number: NE25002

LCAT: Senior Network and Computer Systems Administrator

Overview: S4 is seeking an experienced Senior Unix/Linux OS Administrator to support the USSTRATCOM IT Enterprise at Offutt AFB. This role provides administration, operations, maintenance, troubleshooting, and security compliance support across multiple enterprise enclaves, including NIPR, SIPR, TS LAN, JWICS, and other classified environments.

Key Responsibilities:

• Install, configure, and maintain Linux/Unix operating systems across physical and virtual server environments
• Monitor system performance, availability, and health; provide Tier 2-3 troubleshooting for OS, application, and infrastructure issues
• Apply patches, updates, and DISA STIGs to ensure compliance with DoD cybersecurity standards
• Support Red Hat Enterprise Linux environments, including Ansible, Satellite, and system automation
• Assist with deploying and managing virtual machines and storage systems (VMware, NetApp)
• Maintain accurate system documentation, operational checklists, and configuration records
• Follow established change management and configuration control procedures for all updates and installs
• Provide system health and status reporting, including patching, compliance, and outage information

Required Qualifications:

• Active Top Secret security clearance and eligible for SCI access
• Cloud+ or GICSP or SSCP or Security+ or GSEC certification required
• At least 8 years of hands-on experience administering Linux/Unix systems in secure or enterprise environments
• Proficiency with Red Hat Linux, patching, system updates, and configuration management
• Familiarity with VMware environments and NetApp storage solutions
• Strong troubleshooting skills with experience providing Tier 2-3 support
• Ability to follow supported procedures, change control processes, and maintain documentation
• Excellent communication and teamwork skills to support mission-critical operations

Desired qualifications:

• One of the following certifications is preferred: ITIL 4 Foundations; Red Hat Certified Systems Administrator; or Linux Professional Institute Certification Linux Administrator; or CompTIA Linux+; or Oracle Certified Professional Oracle Linux System Administrator; or Red Hat Certified Engineer; or Oracle Certified Professional Solaris System Administrator; or Red Hat Certified Specialist in Ansible Automation

To apply to this position, please go to www.s4inc.com and click on Careers to complete an employment application and to upload your resume.

S4 offers competitive salaries and a comprehensive benefits package with 401(k), and universal time off. We are an Equal Opportunity Employer-minorities/females/veterans/individuals with disabilities/sexual orientation/gender identity. S4 participates in the E-Verify employment verification program. If you are looking for a challenging and rewarding position, then we invite you to submit your resume, including salary history/requirements. The candidate selected must be able to obtain and maintain the security clearance required by the contract at all times

If you are an individual with a disability or a disabled veteran and need a reasonable accommodation to apply to a position, please contact HR by email at accommodation@s4inc.com.