Provides scientific, engineering, analytical, and programmatic support for DOE/NNSA nuclear security research and development programs. Reviews technical proposals, projects, experiments, risks, schedules, costs, and performance; prepares assessments, reports, briefings, and recommendations; coordinates technical reviews and stakeholder collaboration; supports program planning, tracking, workforce development, and rapid-response requirements. Requires advanced STEM education, specialized nuclear or energetic materials experience, DOE Q clearance eligibility, strong communication skills, and travel to facilities and partner sites.