Lead, Systems Administrator

L3Harris International; Waco (TX); On-site; USD 120,000 - 180,000; Full time

Job summary

L3Harris Technologies is seeking an Information Security Systems Engineer 5 to own Linux and Windows infrastructure in Waco’s secure lab and air-gap environments. You will provision, secure, operate, and document systems supporting US Government programs.

The role requires strong experience with Red Hat Linux, Windows Server, Active Directory, and security hardening, plus collaboration with program teams and security stakeholders to maintain STIG baselines and continuous monitoring.

Qualifications

• Bachelor’s Degree in Computer Science, Information Technology, or related field with minimum 9 years of experience.
• Graduate Degree in Computer Science, Information Technology, or related field with at least 7 years of experience.
• In lieu of a degree, minimum of 13 years of related systems administration experience.

Responsibilities

• Administer Red Hat-based Linux and Windows Server environments in secure lab and air-gap settings.
• Provision, patch, manage privileges, and handle identity services across Windows and Linux.
• Support secure development infrastructure, including access control and standardized images.
• Harden and audit systems per security guidance; implement STIG baselines and patching.
• Maintain asset and service inventories, diagrams, SOPs, and audit artifacts.
• Provide on-site incident response and coordination for outages and vulnerabilities.

Skills

Linux administration

Windows administration

Active Directory

Shell scripting

Network services

Storage services

System hardening

Secure environments support

Education

Bachelor’s Degree in Computer Science, Information Technology, or a related field

Graduate Degree in Computer Science, Information Technology, or a related field

Tools

Ansible

AWX

Puppet

Chef

Active Directory

FreeIPA

LDAP

Kerberos

GitLab

GitHub

SVN

Job description

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: Information Security Systems Engineer (Linux/Windows Systems Administrator) 5

Job Code: 46907

Job Location: Waco, TX

Job Schedule: 9/80: Employees work 9 out of every 14 days- totaling 80 hours worked- and have every other Friday of

Job Description:

The Information Security Systems Engineer 5 (Linux/Windows Systems Administrator) serves as the dedicated systems administrator for Waco's secure, isolated lab and air-gap environments. The role provides on-site ownership for the Linux and Windows infrastructure that supports multiple US Government Programs, engineering, and related mission work. The administrator provisions, secures, operates, troubleshoots, and documents systems and services while maintaining clear boundaries among Secure Area IT, Program teams, and Industrial Security.

Essential Functions:

• Administer Red Hat-based Linux servers and workstations and Windows Server and workstations, including provisioning, troubleshooting, patching, privilege management, identity and access administration, configuration changes, and lifecycle support across secure lab and isolated network environments.
• Build and maintain infrastructure services such as DNS, DHCP, NFS, automounts, SMB/Samba, Windows domain services, Active Directory, FreeIPA or LDAP, NTP, virtualization, storage, backup, and monitoring. Keep these services documented and recoverable so the air-gap environment can support users and engineering teams without relying on remote enterprise access.
• Support software engineers with secure development infrastructure, including controlled remote access, standardized workstation and server images, source-code and DevOps platforms, and practical troubleshooting of multi-operating-system environments. Translate engineering needs into supportable services and clear ownership boundaries.
• Partner with information security stakeholders to harden and audit systems to security guidance. Implement or sustain STIG baselines, patching, vulnerability remediation, endpoint protection, centralized logging, security-tool integration, and evidence needed for CMMC, ATO, continuous monitoring, and Program accreditation activities.
• Maintain operational evidence and status reporting, including asset and service inventories, ownership records, network and configuration diagrams, standard operating procedures, change records, audit artifacts, and clear reporting of open gaps, owners, aging, and next actions.
• Provide on-site operational response for incidents, outages, recovery activities, vendor coordination, emergency coverage, and closeout actions. Help stabilize a dependable local support model for the Waco secure-area environment and keep the program moving from partial operation toward an accredited sustainment model.

Qualifications:

• Bachelor’s Degree in Computer Science, Information Technology, or a related field and minimum 9 years of prior relevant experience. Graduate Degree in Computer Science, Information Technology, or a related field and a minimum of 7 years of prior related experience. In lieu of a degree, minimum of 13 years of prior related experience in systems administration.
• Hands-on experience with Linux administration on Red Hat-based distributions, Windows administration, Active Directory, shell scripting, network and storage services, system hardening, and support for secure environments.

Preferred Additional Skills:

• Experience with configuration management and automation tools such as Ansible, AWX, Puppet, or Chef; centralized authentication technologies such as Active Directory, FreeIPA, LDAP, Kerberos, or IDM; and source code platform administration using GitLab, GitHub, or SVN.
• Security+ or equivalent security certification is strongly desired; experience with STIG implementation, audit readiness, Windows domain operations, and cross-functional support in defense or regulated environments is highly valuable.
• Familiarity with CI/CD pipelines, DevOps platforms, log analysis, metrics and monitoring, virtualization, multi-operating-system environments, cloud platforms, and security-focused troubleshooting in distributed systems.

L3Harris Technologies is proud to be an Equal Opportunity Employer. L3Harris is committed to treating all employees and applicants for employment with respect and dignity and maintaining a workplace that is free from unlawful discrimination. All applicants will be considered for employment without regard to race, color, religion, age, national origin, ancestry, ethnicity, gender (including pregnancy, childbirth, breastfeeding or other related medical conditions), gender identity, gender expression, sexual orientation, marital status, veteran status, disability, genetic information, citizenship status, characteristic or membership in any other group protected by federal, state or local laws. L3Harris maintains a drug-free workplace and performs pre-employment substance abuse testing and background checks, where permitted by law.

Please be aware many of our positions require the ability to obtain a security clearance. Security clearances may only be granted to U.S. citizens. In addition, applicants who accept a conditional offer of employment may be subject to government security investigation(s) and must meet eligibility requirements for access to classified information.

By submitting your resume for this position, you understand and agree that L3Harris Technologies may share your resume, as well as any other related personal information or documentation you provide, with its subsidiaries and affiliated companies for the purpose of considering you for other available positions.

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