Senior Specialist, System Administration

L3Harris is dedicated to recruiting and developing high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers’ mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work-life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do. L3Harris is the Trusted Disruptor in defense tech. With customers’ mission-critical needs always in mind, our employees deliver end-to-end technology solutions connecting the space, air, land, sea and cyber domains in the interest of national security. Job Title: Senior Specialist, System Administration Job Code: 43767 Job Location: Greenville, Texas On-site Job Schedule: 9/80 Regular: Off every other Friday, 1st Shift or 5/8 Monday - Friday    Job Description:   We are seeking a dedicated and experienced Linux Administrator with Windows Server experience to join our IT team. The successful candidate will maintain, upgrade, and manage our Linux and Windows-based infrastructure. This role requires a resourceful individual that is comfortable working in a fast-paced environment, ensuring our technology infrastructure runs smoothly and efficiently.  Responsibilities include troubleshooting end-user issues, managing Linux cloud instances and Windows Server configuration, patching, and performance; addressing foundational networking tasks; and delivering adaptable support across multiple programs and locations. The ideal candidate is resourceful and customer-focused, with excellent organizational skills, the ability to prioritize effectively amid shifting daily demands, and a proactive approach to listening and tailoring solutions to end-user needs.   Essential Functions:   Install, configure, and maintain Linux servers and associated software in a multi-platform environment. Install, configure, and maintain Windows Server infrastructure, ensuring seamless integration and operation with Linux systems. Experience with virtualization platforms (vSphere, KVM, Proxmox, etc.) Hands-on Kubernetes experience, including deploying and debugging workloads Familiarity with SDN and modern networking (NSX-T, Calico, Cilium, load balancers, TLS) Proficiency with infrastructure-as-code (Terraform, Ansible) and automation scripting Experience with CI/CD tooling and Git-based workflows (GitLab CI, GitHub Actions, etc.) Understanding of identity and access management (OIDC, OAuth2, Keycloak or equivalent) Experience running stateful or platform components (object storage, databases, registries) in Kubernetes Strong understanding of distributed systems concepts, observability, and troubleshooting Monitor system performance and troubleshooting issues, ensuring high availability and optimal performance of all systems. Implement and oversee security protocols, conduct system backups, and ensure data recovery processes are in place. Collaborate with network staff to ensure smooth and reliable operation of software and systems for fulfilling business objectives and processes. Create and maintain documentation on system configuration, mapping, processes, and service records. Review system and application logs and verify completion of scheduled jobs such as backups. Automate routine tasks using scripting languages such as Bash, Python, or Perl. Familiarity / knowledge of disaster recovery software, exercises, and actual events. Provide technical support and guidance to users and other team members. Ensure compliance with internal policies and regulatory standards.

Active CompTIA Security+ certification. Active security clearance A professional certification in Linux administration is preferred. Certifications such as LPIC, RHCSA, or CompTIA Linux+ are highly desirable. Bachelor’s Degree and minimum 6 years of prior relevant experience. Graduate Degree