L3Harris Technologies is currently seeking a Senior Specialist, Systems Engineer – Mission Protection Specialist to support a high-visibility, mission-critical national security program. This position is responsible for identifying, assessing, and mitigating threats to space, cyber, and ground systems supporting U.S. government missions. The ideal candidate will apply operational security (OPSEC), counterintelligence, cyber defense, and threat principles to protect sensitive capabilities to ensure the survivability of U.S. assets in contested environments. Conduct mission protection assessments to identify vulnerabilities across space, cyber, and ground architectures. Collaborate with mission planners, operators, and mission partners to integrate protection strategies throughout the system lifecycle. Support the development of mitigation plans and help implement countermeasures aligned with mission assurance priorities. Coordinate with DoD and IC stakeholders to ensure protection ef...