Sr. Specialist Cyber Infrastructure Engineer

L3HHCM20 • Carlsbad, CA

7d

About The Position

L3Harris is seeking a highly skilled Cyber Infrastructure Engineer to join our Carlsbad, CA team. This role requires proven expertise across Ubuntu, Red Hat, and Windows environments, enterprise networking (Cisco, Juniper), and hands-on experience supporting classified and air-gapped systems. The engineer will design, implement, and secure infrastructure aligned with DoD Collateral requirements, DISA STIGs, NIST RMF, and FIPS compliance standards while enabling mission-critical operations.

Requirements

• Bachelor’s degree in Computer Science, Information Systems, Cybersecurity, or related discipline; advanced degree or equivalent senior-level experience strongly preferred.
• Active Secret clearance required; ability to obtain and maintain a Top Secret / SCI clearance post-hire.

Nice To Haves

• Minimum of 10 years of progressive IT and security experience, with a proven record in systems administration, cybersecurity engineering, and secure infrastructure management.
• Extensive expertise in applying the Risk Management Framework (RMF), NIST SP 800-53 controls, and compliance with DCSA/DAAPM and related DoD standards.
• Deep technical proficiency with Linux (Ubuntu/Red Hat) and Windows Server operating systems, including hardening, patching, and performance optimization in classified environments.
• Proven leadership in architecting, deploying, and securing enterprise network infrastructures, with strong understanding of Cisco, Juniper, and cross-domain networking protocols.
• Expert-level knowledge of virtualization (VMware ESXi, Hyper-V) and containerization technologies, including secure deployment within mission-critical systems.
• Experience with virtualization technologies and containerization.
• Familiarity with the Risk Management Framework and its application in securing IT systems.
• Superior communication, documentation, and stakeholder engagement skills, with the ability to brief senior leadership, government assessors, and cross-functional teams.
• Proven ability to operate independently while mentoring and collaborating across technical and security teams to achieve enterprise-wide objectives.
• Advanced proficiency with enterprise security and compliance tools including ACAS (Nessus), STIGViewer, SCAP, and Splunk, with the ability to analyze outputs and drive remediation.
• Extensive background as a Linux System Administrator in secure, classified environments, with expertise in hardening, automation, and lifecycle sustainment.
• Comprehensive knowledge of federal and defense cybersecurity requirements, including NISPOM, DAAPM, JSIG, ICDs, and associated compliance frameworks.
• Industry-recognized certifications such as CISSP, RHCSE, or equivalent senior-level credentials.

Responsibilities

• Engineer and oversee administration of Linux (Ubuntu/Red Hat) and Windows Server enterprise environments, ensuring mission-critical uptime and compliance in classified domains.
• Architect, configure, and direct operations of Cisco and Juniper networking equipment within classified/air-gapped networks, ensuring strict adherence to 32 CFR Part 117 (NISPOM), DAAPM, JSIG, NIST standards, and CCRI readiness.
• Lead the design, deployment, and optimization of VMware ESXi infrastructures, including migrations from bare metal to virtualized environments.
• Manage and safeguard NetApp storage solutions, ensuring data integrity, continuity of operations, and secure handling of classified data.
• Implement and govern enterprise Splunk platforms for centralized logging, monitoring, and compliance reporting, aligning outputs with DCSA and DoD audit requirements.
• Oversee audit and incident response by reviewing electronic and manual logs, investigating anomalies, and directing remediation of identified security incidents.
• Conduct and validate enterprise vulnerability management through Nessus scanning, application of DISA STIGs, and enforcement of FIPS-validated cryptography.
• Direct enterprise endpoint management leveraging Ivanti for patch automation, compliance enforcement, and lifecycle sustainment of systems.
• Lead NIST RMF activities by authoring and reviewing accreditation documentation, validating technical controls, and in preparation for DCSA audits.
• Provide Tier III support for escalated issues and lead troubleshooting efforts.
• Collaborate with senior security leadership (ISSM, FSO, Program Managers) to ensure continuous system compliance and readiness for government assessment.
• Maintain eligibility and clearance standards by holding a current Secret clearance with the ability to obtain Top Secret post-hire

Benefits

• L3Harris 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.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 5,001-10,000 employees