Sr. Associate, Cyber Infrastructure Systems Engineer - Systems Administrator

L3Harris Technologies•Colorado Springs, CO

26d•$70,500 - $130,500•Onsite

About The Position

L3Harris is seeking an experienced Cyber Infrastructure Systems Engineer to join its Colorado Springs, Colorado team. The role administers and maintains Windows-based servers and workstations across a DoD-cleared enterprise environment. It includes managing patching, monitoring system performance, applying system hardening measures, and supporting security compliance and operational reliability. The position also involves troubleshooting, vulnerability remediation, and continuous improvement of system configurations and processes. The work schedule is 5/8: eight hours per day, five days per week. The role requires a Secret clearance and a qualifying DoD 8570.01-M IAT Level II certification. The stated Colorado salary range is $70,500–$130,500; final compensation may vary based on factors such as experience and geographic location. The application window closes on 11/10/2026.

Requirements

Bachelor’s degree and at least 2 years of related experience; alternatively, a graduate degree or equivalent with 0–2 years of related experience; or at least 6 years of related experience in lieu of a degree.
Secret clearance.
DoD 8570.01-M IAT Level II professional certification: CCNA Security, Security+ CE, or a higher certification.

Nice To Haves

Experience serving as a DoD COMSEC Manager or supporting COMSEC account management, including handling, safeguarding, inventorying, and controlling cryptographic equipment and keying material according to 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.
Experience with virtualization technologies such as KVM, VMware, vSphere/vCenter, and microservices or containers such as OpenShift and Docker.

Responsibilities

Administer, maintain, and support Windows-based servers and workstations in a cleared enterprise or mission-critical DoD environment.
Manage deployment of operating system patches, security updates, and hotfixes according to approved maintenance schedules and security requirements.
Implement and sustain system hardening measures using applicable DoD security standards, STIGs, and organizational cybersecurity policies.
Identify and remediate vulnerabilities to support RMF controls, POA&M tracking, and audit readiness.
Monitor system performance, availability, and operational health to support reliability and continuity of mission systems.
Troubleshoot and resolve hardware, software, operating system, and access-related issues while following established security procedures.
Maintain accurate system configurations, change records, and technical documentation for configuration management and compliance inspections.
Coordinate with cybersecurity, network, and program teams on accreditation activities, incident response, and secure operations in classified or controlled environments.