Linux Systems Administrator

Overview

i3 is seeking an experienced Linux Systems Administrator with an emphasis on Red Hat OpenShift to support a U.S. Army program. The selected candidate will be responsible for deploying, configuring, securing, maintaining, and troubleshooting enterprise Linux systems and containerized infrastructure within a highly secure computing environment.

This position will play a key role in the continued development, integration, and sustainment of our Red Hat OpenShift platform, supporting traditional enterprise services, DevSecOps capabilities, and emerging AI/ML workloads.

The ideal candidate will possess a strong foundation in Red Hat Enterprise Linux (RHEL), hands-on experience with OpenShift or Kubernetes administration, and a demonstrated ability to automate infrastructure operations. Familiarity with Red Hat OpenShift AI, NVIDIA Run, or GPU-accelerated computing environments is highly desirable.

Responsibilities

Linux Systems Administration

• Build, configure, secure, and maintain Red Hat Enterprise Linux (RHEL) operating systems across physical and virtual infrastructure.
• Develop, maintain, and manage standardized Linux system images and configurations using source code management and automation tools.
• Integrate Linux systems with Microsoft Active Directory using SSSD and other enterprise identity management solutions.
• Configure and maintain multifactor authentication, CAC/smartcard PKI authentication, and certificate management in mixed Windows/Linux environments.
• Maintain software repositories, package mirrors, and patch management solutions using Red Hat Satellite and supporting automation scripts.
• Perform operating system patching, vulnerability remediation, performance tuning, troubleshooting, and lifecycle management.

Red Hat OpenShift & Container Platform Administration

• Deploy, configure, administer, and maintain Red Hat OpenShift clusters across bare-metal and virtualized infrastructure.
• Manage OpenShift cluster nodes, operators, networking, persistent storage, authentication, role-based access controls (RBAC), and platform updates.
• Troubleshoot cluster health, container workloads, resource utilization, and underlying infrastructure dependencies.
• Support integration of OpenShift with enterprise networking, storage, virtualization, and identity management services.
• Assist development teams with containerized application deployments, cluster resource allocation, and DevSecOps CI/CD pipeline operations.
• Support the implementation of highly available, scalable, and secure container platforms.
• Assist with OpenShift platform standardization, operational documentation, monitoring, and ongoing sustainment.

Automation & DevSecOps

• Develop and maintain Infrastructure as Code (IaC) configurations using Ansible, Terraform, GitLab, and related automation tools.
• Automate Linux and OpenShift deployment, configuration, patching, and maintenance activities.
• Collaborate with engineering and development teams to support secure CI/CD pipelines and containerized application delivery.
• Maintain configuration baselines, operational procedures, and technical documentation.

Cybersecurity & Compliance

• Apply and maintain security configurations in accordance with DISA Security Technical Implementation Guides (STIGs).
• Support DoD Risk Management Framework (RMF) requirements, system hardening, vulnerability management, and continuous monitoring.
• Assist with security assessments, remediation activities, and maintenance of approved system configurations.
• Ensure Linux and OpenShift environments operate in accordance with established cybersecurity policies and security requirements.

Qualifications

• Bachelor's degree in Cybersecurity, Computer Science, Computer Engineering, Information Systems, or a related field, or equivalent relevant experience.

• At least 6 years of hands-on experience in systems administration, with strong emphasis on Linux/Red Hat
• Must have DoD 8570/8140 IA Certification (Security+ CE) or be able to obtain certification within 6 months of hire date.
• Demonstrated experience administering Red Hat Enterprise Linux or comparable enterprise Linux distributions.
• Working knowledge of Red Hat OpenShift or Kubernetes architecture, administration, and container orchestration.
• Experience with Linux system installation, configuration, patching, troubleshooting, and performance monitoring.
• Familiarity with virtualization technologies and enterprise infrastructure environments.
• Experience with automation, scripting, and configuration management tools such as Ansible, Bash, Python, or Terraform.
• Understanding of Linux networking, DNS, storage, authentication, and security fundamentals.
• Familiarity with Git-based source control and Infrastructure as Code practices.
• Strong analytical, troubleshooting, documentation, and team collaboration skills.
• Ability to obtain and maintain a U.S. SECRET security clearance.

Preferred Qualifications

• Hands-on experience deploying, administering, or troubleshooting Red Hat OpenShift clusters in enterprise environments.
• Experience with Red Hat OpenShift AI, including AI/ML workload deployment, model serving, or platform integration.
• Familiarity with NVIDIA Run for GPU resource management, scheduling, and workload orchestration.
• Understanding of GPU-accelerated computing, NVIDIA GPU Operator, and AI/ML infrastructure.
• Experience supporting OpenShift in disconnected, air-gapped, or restricted network environments.
• Knowledge of Kubernetes operators, Helm, container registries, persistent storage, and cluster networking.
• Experience integrating OpenShift with enterprise storage, virtualization, and network infrastructure.
• Familiarity with Red Hat Satellite, enterprise software repository mirrors, and disconnected patch management.
• Experience implementing DISA STIGs, DoD RMF security controls, and secure system configurations.
• Relevant Red Hat certifications such as RHCSA, RHCE, or Red Hat Certified OpenShift Administrator.

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.
• 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.

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

Founded in 2007, Integration Innovation, Inc. (i3) is headquartered in Huntsville, AL, with additional offices in Orlando, FL, and the National Capital Region. We are a 100% team member-owned mid-tier integrator with over 800 employee-owners, and our culture speaks for itself: we've earned ten Best Places to Work® awards, driven by strong employee engagement, transparent leadership, and a genuine commitment to communication.

i3 team members operate at the leading edge of national defense across a broad range of technical disciplines, from systems and software engineering to modeling, simulation, and training solutions to cybersecurity, digital engineering, and enterprise IT. We also take products from prototype through production, bringing that same engineering rigor to manufacturing and delivering hardware at scale. For candidates, that means a rare opportunity: the innovation and mission focus of an engineering services company paired with the hands-on impact of building and delivering real solutions that benefit the Warfighter, all inside an employee-owned company where your contributions directly shape both the mission and your ownership stake in the business.