Senior Systems Administrator

L3

Harris 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. L3

Harris 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.

L3

Harris 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 Systems Administrator

Job Number: 34871

Job Location: Yorba Linda, CA

Job Schedule: 4/10 or 9/80

Clearance: Must have an Active Department of War Security Clearance to be considered

During its 120‑year history, L3

Harris has transformed communications and information technology. L3

Harris is a proven leader in tactical communications, geospatial systems and services, air traffic management, environmental solutions, avionics and electronic warfare, and space and intelligence. From ocean to orbit and everywhere in between, we provide mission‑critical solutions to connect, inform and protect the world. On the L3

Harris team, your job is to secure the world. We don't work here just for the advanced technology and equipment: we work here because we know what—and who—we're protecting! From families to the intelligence community, and from our climate to our men and women in uniform, we're making the world a safer place.

• Perform system administration and helpdesk type tasks under the supervision of a manager.
• Supporting servers, desktop and laptop PCs.
• Installation, upgrades, repair and maintenance of disconnected Local Area Networks (LANs) and networked resources attached to a Wide Area Network (WAN).
• Support for network backup systems (Veeam/Backup Exec).
• Configuration support for user applications.
• IT asset management.
• Rotational after‑hours Patch Management (SCCM/MECM).
• Secret Clearance is required day 1.
• Ability to work well with technical and non‑technical staff is required.

• Bachelor’s Degree and a minimum of 6 years of prior related experience.
• Graduate Degree and a minimum of 4 years of prior related experience.
• In lieu of a degree, minimum of 10 years of prior related experience.
• 6–8 years of expert experience with operating systems such as Windows Server 2019/2022/2025, Windows 10/11, Red Hat Enterprise Linux 8/9.
• Advanced understanding and implementation of DISA System Technical Implementation Guides (STIGs).
• 6–8 years of experience with GPO management and implementation.
• Knowledgeable experience with RHEL LDAP/AD authentication protocols and methodologies.
• Secret Clearance is required day 1.
• Minimum DoD‑8140 Work Role 451‑Intermediate certification (Cloud+, GICSP, GSEC, Security+, SSCP).

• Advanced knowledge of Veritas/Arctera Backup Exec or other backup technologies and methodologies.
• Experience with TrueNAS storage technologies.
• Experience with Red Hat Satellite.
• Experience with Ansible Tower.
• Experience with SharePoint Administration/Development.
• Web Application Management (Apache/Java).
• Very good written and verbal communication skills required.

In compliance with pay transparency requirements, the salary range for this role in California, Massachusetts, New Jersey, Washington, and the Greater D.C., Denver, or NYC areas is Min $ – $ Max. The salary range for this role in Colorado state, Hawaii, Illinois, Maryland, Minnesota, New York state, Cleveland Ohio, and Vermont is $88,500.00 Min – $ Max. This is not a guarantee of compensation or salary;

the final offer amount may vary based on factors including but not limited to experience and geographic location. L3

Harris also offers a variety of benefits, including health and disability insurance, 401(k) match, flexible spending accounts, EAP, education assistance, parental leave, paid time off, and company‑paid holidays. The specific…