Systems Administrator (Secret Clearance)

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: Specialist, Cyber Infrastructure Systems Engineer (System Administration) Job Code: 39385 Job Location: Colorado Springs, CO Job Schedule: Standard 5/8   Job Description:     We are seeking a skilled and experienced Cyber Infrastrastructure Systems Engineer (CISE) to join our Colorado Springs, CO team. This role requires an experience system administrator who will be responsible for the administration and maintenance of Windows-based servers and workstations across a DoD cleared enterprise environment. Duties include managing patching activities, monitoring system performance, and implementing system hardening measures to strengthen security, ensure compliance with organizational standards, and maintain operational reliability. The position also supports ongoing troubleshooting, vulnerability remediation, and continuous improvement of system configurations and processes.     Essential Functions:     Administer, maintain, and support Windows-based servers and workstations within a cleared enterprise or mission-critical DoD environment. Manage the deployment of operating system patches, security updates, and hotfixes in accordance with approved maintenance schedules and security requirements. Implement and sustain system hardening measures using applicable DoD security standards, STIGs, and organizational cybersecurity policies. Perform vulnerability identification and remediation activities to support compliance with RMF controls, POA&M tracking, and audit readiness efforts. Monitor system performance, availability, and operational health to ensure reliability and continuity of mission systems. Troubleshoot and resolve hardware, software, operating system, and access-related issues while adhering to established security procedures. Maintain accurate system configurations, change records, and technical documentation to support configuration management and compliance inspections. Coordinate with cybersecurity, network, and program teams to support accreditation activities, incident response, and secure system operations in classified or controlled environments.

Bachelor’s Degree with a minimum of 4 years of relevant experience, or Graduate Degree with a minimum of 2 years of relevant experience, or in lieu of a degree, a minimum of 8 years of prior related experience. Secret Clearance DoD 8570.01-M IAT Level 2 Required Professional Certifications: CCNA- Security, Security+ CE, or higher certification     Preferred Additional Skills:     Experience serving as a DoD COMSEC Manager or supporting COMSEC account management, including handling, safeguarding, inventorying, and controlling cryptographic equipment and keying material in accordance with applicable DoD policies and procedures. Experience administering and supporting Red Hat Enterprise Linux (RHEL) systems in a DoD, federal, or other regulated environment, including patching, system hardening, user administration, and troubleshooting Utilizing virtualization technologies such as KVM, VMware, vSphere/vCenter, and microservices/containers (e.g., OpenShift, Docker) to enhance system functionality and efficiency       In compliance with pay transparency requirements, the salary range for this role in