Senior Linux System Administrator

About the role

i3 is seeking a Senior Linux System Administrator to join our team. The ideal candidate will have extensive experience maintaining and securing Linux systems in a classified environment.

Responsibilities

• Build and maintain Linux configurations according to DISA STIGs and JSIG requirements
• Manage user accounts, permissions, and perform daily monitoring
• Run regular ACAS scans, handle system patching, and remediate vulnerabilities
• Own and administer GitLab environment, including managing users, configuring repositories, and supporting CI/CD pipelines
• Handle containerization and Kubernetes
• Take care of routine backups and document system installation and security
• Communicate effectively with engineering and security teams to troubleshoot complex issues
• Occasionally provide support during off-hours

Requirements

• Associate's or Bachelor's degree in Computer Science, IT, or a related field (or equivalent hands-on work experience)
• 10+ years of Linux systems administrator experience, specifically working inside classified environments
• Active Top Secret clearance (including SAP Eligibility)
• U.S. Citizenship is required
• Deep experience working in a mixed OS environment (Red Hat Enterprise Linux and Windows Server)
• Strong scripting skills—comfortable writing in Bash, Python, or PowerShell
• Real-world experience with GitLab, CI/CD configurations, Kubernetes, and containerization
• Heavy familiarity with DoD security practices, ACAS, and applying STIGs
• CompTIA Security+ and Red Hat certification (RHCSA or higher), with Network+ and containerization certs as a plus
• Knowledge of OPSEC and PHYSEC measures, and ability to conduct oneself professionally in a classified environment
• Preferred: Red Hat Certified Engineer (RHCE) certification, Cisco certification (CCNA or above), hands-on experience with virtualization, and knowledge of log centralizing tech like Splunk or the ELK Stack

Qualifications

• Associate's or Bachelor's degree in Computer Science, IT, or a related field (or equivalent hands-on work experience)
• 10+ years of Linux systems administrator experience, specifically working inside classified environments
• Active Top Secret clearance (including SAP Eligibility)
• U.S. Citizenship is required
• Deep experience working in a mixed OS environment (Red Hat Enterprise Linux and Windows Server)
• Strong scripting skills—comfortable writing in Bash, Python, or PowerShell
• Real-world experience with GitLab, CI/CD configurations, Kubernetes, and containerization
• Heavy familiarity with DoD security practices, ACAS, and applying STIGs
• CompTIA Security+ and Red Hat certification (RHCSA or higher), with Network+ and containerization certs as a plus
• Knowledge of OPSEC and PHYSEC measures, and ability to conduct oneself professionally in a classified environment
• Preferred: Red Hat Certified Engineer (RHCE) certification, Cisco certification (CCNA or above), hands-on experience with virtualization, and knowledge of log centralizing tech like Splunk or the ELK Stack

Skills

• Knowledge of office administration and procedures
• Exceptional judgment capabilities and relationship management skills
• Excellent communication, teamwork, and client service skills; ability to clearly communicate in discussions and written documents, and to deliver feedback clearly and tactfully
• Interact with a diverse array of customers and staff in a professional and courteous manner
• Work independently with accountability for accurate and complete results
• Be extremely organized and exceptionally detail oriented
• Work well both independently and in a team environment
• Be energized by a fast-paced work environment
• Must be able to communicate with others effectively
• Analyze information and respond appropriately
• Manage time wisely and prioritize tasks
• Provide superior customer service
• Multi-task in a pleasant manner
• Work well under pressure

Benefits

• Regular i3 hours are 800 a.m. - 500 p.m. Monday-Friday, with occasional additional hours required
• Long-term financial security
• Higher job satisfaction
• Greater job security
• Personal and professional growth
• Great company culture
• Outstanding benefits including excellent insurance coverage, 401(k) match, generous PTO, health and wellness incentives, tuition and certification reimbursement, and countless opportunities to give back to the community through i3 Cares

Pay

Competitive salary commensurate with experience

Schedule

Regular i3 hours are 800 a.m. - 500 p.m. Monday-Friday, with occasional additional hours required