Senior Network Engineer with Security Clearance

Business Unit: Cubic Defense
Company Details: When you join Cubic, you become part of a company that creates and delivers technology solutions in transportation to make people’s lives easier by simplifying their daily journeys, and defense capabilities to help promote mission success and safety for those who serve their nation. Led by our talented teams around the world, Cubic is committed to solving global issues through innovation and service to our customers and partners. We have a top-tier portfolio of businesses, including Cubic Transportation Systems (CTS) and Cubic Defense (CD). Explore more on Cubic.com.
Job Details:
Position Summary
The Principal Network Engineer serves as a senior technical leader responsible for the architecture, integration, sustainment, modernization, and operational performance of enterprise and mission network infrastructures supporting Department of Defense (DoD) programs and operational environments. This position provides technical leadership across complex network and Cross Domain Solution (CDS) architectures spanning multiple classified and unclassified environments, ensuring reliable, secure, and mission-ready communications capabilities. The Principal Network Engineer leads the design, engineering, integration, testing, accreditation, deployment, and lifecycle management of enterprise networking and data transport capabilities. This role is responsible for establishing technical direction, evaluating emerging technologies, defining architecture standards, resolving complex technical challenges, and providing engineering oversight throughout program execution. This position serves as a primary technical interface with government stakeholders, program leadership, cybersecurity organizations, systems engineering teams, operational support personnel, and external mission partners to ensure integrated network solutions align with mission requirements, cybersecurity mandates, operational objectives, and long-term modernization strategies. The role requires deep expertise in Cross Domain Solutions, secure data transfer architectures, network segmentation, enclave connectivity, transport engineering, mission data dissemination, and enterprise network security. The Principal Network Engineer serves as a subject matter expert for CDS architecture and accreditation activities, including Site-Based Security Assessments (SBSAs), Raise the Bar (RTB) 2.0 requirements, National Cross Domain Strategy & Management Office (NCDSMO) policies, RMF implementation, STIG compliance, and DoD cybersecurity standards.
Essential Job Duties and Responsibilities
* Lead the architecture, engineering, integration, modernization, and sustainment of enterprise LAN/WAN and mission network infrastructures supporting multiple operational programs and environments.
* Serve as the principal technical authority for network engineering and Cross Domain Solution implementations across program, site, and enterprise-level architectures.
* Develop and maintain network architecture strategies, technical standards, engineering roadmaps, and modernization plans aligned with mission and program objectives.
* Lead the design, integration, testing, validation, accreditation, deployment, and transition-to-operations of complex network and CDS capabilities.
* Define network architectures, transport solutions, routing strategies, security boundary designs, and secure data transfer approaches supporting mission operations and information-sharing requirements.
* Provide technical leadership during major integration events, mission exercises, site deployments, and operational readiness activities.
* Lead root cause analysis and resolution of highly complex network, transport, interoperability, and CDS integration issues that impact mission operations.
* Evaluate emerging technologies, architectures, and engineering approaches to improve network resilience, scalability, cybersecurity posture, and operational effectiveness.
* Establish engineering processes, design standards, configuration management practices, and implementation guidance to ensure consistency across programs and environments.
* Lead architecture reviews, design reviews, technical interchange meetings, engineering working groups, and customer technical briefings.
* Provide oversight and approval of network configurations, implementation plans, testing methodologies, technical documentation, and operational transition packages.
* Ensure compliance with RMF, STIGs, RTB 2.0 requirements, NCDSMO guidance, DoD cybersecurity policies, and applicable accreditation requirements.
* Lead accreditation planning and technical support activities for CDS deployments, including SBSAs, security documentation, data flow assessments, risk mitigation strategies, and cybersecurity reviews.
* Identify technical risks, architecture gaps, operational vulnerabilities, and integration challenges while developing mitigation strate