Linux Systems Administrator

Overview

i3 is seeking a Linux Systems Administrator to support an Army contract. The selected candidate will provide technical expertise in the deployment, integration, and maintenance of Linux-based systems supporting enterprise infrastructure and mission operations.

The Linux Systems Administrator will work within a secure DevSecOps environment, supporting system automation, configuration management, and secure infrastructure deployment. The role requires collaboration with engineering, cybersecurity, and operations teams to maintain a secure, scalable, and highly automated computing environment.

Candidates must possess, or be able to obtain, a United States SECRET security clearance.

Responsibilities

• Build, configure, and maintain standardized Linux operating systems (such as Red Hat Enterprise Linux 9) across multiple operational use cases.
• Create and maintain Linux virtual machine golden images using source code management and automation pipelines.
• Integrate Linux systems with Active Directory environments using technologies such as SSSD.
• Maintain software repository mirrors using Red Hat Satellite and custom Ansible automation.
• Implement multifactor authentication (MFA) solutions including CAC/Smartcard PKI authentication and certificate management in mixed Windows/Linux environments.
• Collaborate with team members in an Agile development environment to deliver secure, scalable, and reproducible infrastructure.
• Maintain system configurations using Infrastructure as Code (IaC) stored in Git repositories.
• Perform Linux system configuration, patching, and vulnerability remediation using automation tools such as Ansible, Terraform, Chef, or GitLab pipelines.
• Support DevSecOps CI/CD pipelines operating on OpenShift clusters and Linux systems.
• Deploy and maintain OpenShift cluster nodes on both bare-metal and cloud infrastructure.
• Apply system security configurations in accordance with DISA Security Technical Implementation Guides (STIGs).
• Assist with implementation of Risk Management Framework (RMF) 2.0 continuous monitoring processes and tools.
• Support Independent Security Assessments (ISA) and cybersecurity compliance activities.
• Implement system security configurations aligned with Zero Trust architecture principles.
• Deploy and maintain network storage servers supporting Linux environments.
• Create and maintain technical documentation using Markdown and other documentation formats.
• Assist cybersecurity personnel with RMF accreditation documentation, SOPs, policies, and operational procedures.
• Continuously improve system capabilities through research, evaluation, and implementation of new technologies and processes.

Qualifications

• Bachelor's degree in Information Technology, Cybersecurity, Computer Science, Information Systems, Data Science, or related field with 6+ years of experience, or 10+ years of equivalent experience.
• Must meet DoD 8140 Intermediate System Administrator requirements (e.g., Security+, Cloud+, GICSP, SSCP, or GSEC).
• Must possess, or obtain, a Linux computing environment certification in compliance with DoD 8140.
• Willingness to obtain Linux+ certification within 6 months of hire if not already certified.
• Strong experience administering Linux operating systems (RHEL, CentOS, or equivalent).
• Experience troubleshooting and maintaining enterprise Linux environments.
• Familiarity with Linux automation tools such as Ansible, Terraform, or Chef.
• Experience with Infrastructure as Code and source code management (Git).
• Experience with OpenShift or Kubernetes environments preferred.
• Strong understanding of DoD cybersecurity practices and compliance frameworks (STIG, RMF).
• Ability to work independently and collaboratively in a team-oriented environment.
• Excellent customer service and communication skills.
• Active Secret Security Clearance preferred, or ability to obtain and maintain one.
• U.S. Citizenship required.

Knowledge/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.
• Communicate well: listening, verbal, and written.
• 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.

PHYSICAL DEMANDS

• The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job.
• While performing the duties of this job, the employee is regularly required to talk or hear. The employee frequently is required to stand; walk; handle or feel; and reach with hands and arms.
• The employee is occasionally required to sit; climb or balance; and stoop, kneel, crouch or crawl. The employee must be able to lift and/or move up to 10 pounds and occasionally lift and/or move up to 25 pounds.
• Specific vision abilities required by this job include close vision, distance vision, peripheral vision, depth perception and ability to adjust focus.
• Regular i3 hours are 8:00 a.m. - 5:00 p.m. Monday-Friday, however, additional hours may be required on occasion. Regular and punctual attendance is required.

About i3

i3 is a technically diverse, 100% team member owned business, headquartered in Huntsville, Alabama specializing in missile and aviation systems engineering and logistic services, electronic warfare and electromagnetic effects analysis, UAS system integration and flight operations, full lifecycle C5ISR engineering services, cybersecurity and IT/IA innovative solutions and virtual training, simulation & serious game development and implementation. We have established a broad offering of products and capabilities collectively providing decades of experience supporting the full complement of DoD military services, Missile Defense Agency, National Aeronautics and Space Administration, and a variety of other Government organizations and private industry customers.

Perks of being a team member owner include:

• Long-term financial security
• Higher job satisfaction
• Greater job security
• Personal and professional growth
• Great company culture

Other outstanding benefits:

• Excellent insurance coverage
• 401(k) match
• Generous PTO
• Health and wellness incentives
• Tuition and certification reimbursement
• Countless opportunities to give back to the community through i3 Cares

We work hard. We compete hard. We play hard. Apply now to join us!