Director of Nuclear Engineering

Join Xcimer Energy as a full‑time, onsite Director of Nuclear Engineering based at our headquarters in Denver, CO.

• Build, lead, and grow the Nuclear Engineering Department, including hiring, onboarding, mentoring, and performance development of engineering staff
• Develop career paths and technical leadership pipelines for nuclear engineers while fostering a culture of technical rigor, collaboration, safety, and continuous improvement
• Establish, document, and maintain nuclear engineering standards, methods, and best practices across concept development, design, testing, and operations
• Define and maintain the nuclear design basis for Xcimer facilities and programs, ensuring assumptions, analyses, and requirements support performance, safety, and regulatory objectives
• Partner with Program Directors and Managers to ensure nuclear engineering activities are appropriately scoped, resourced, prioritized, and scheduled
• Identify nuclear engineering risks early and collaborate cross‑functionally to develop and implement mitigation strategies
• Ensure disciplined execution of core nuclear engineering activities, including radiation transport and shielding analysis, activation analysis, source term definition, uncertainty analysis, and support for radiological safety and hazards analysis
• Collaborate closely with Systems Engineering, Facilities, Test, Operations, ES&H, and peer engineering departments to integrate nuclear engineering considerations into system architectures, facility designs, and operational procedures
• Define and execute a long‑term roadmap for nuclear engineering capability growth, including external partnerships with national laboratories, academic institutions, and industry collaborators
• Represent Xcimer in technical forums and within the broader nuclear engineering community to build technical credibility and attract top‑tier talent

• Advanced degree in Nuclear Engineering or closely related technical field;
  PhD strongly preferred
• 15+ years of experience in nuclear engineering, including senior technical leadership responsibilities
• Demonstrated experience building, mentoring, and leading high‑performing technical teams
• Strong foundation in radiation physics, nuclear engineering fundamentals, and analytical methods
• Experience with deterministic and Monte Carlo neutron/photon transport methods
• Experience using nuclear engineering analysis tools such as MCNP, OpenMC, or equivalent software
• Experience planning and managing technical work, including schedules, budgets, and performance metrics
• Experience operating effectively within matrix organizations and multidisciplinary technical environments
• Excellent written and verbal communication skills with the ability to communicate complex technical concepts to both technical and non‑technical audiences
• Must be a U.S. citizen or national, U.S. permanent resident (current Green Card holder), or lawfully admitted into the U.S. as a refugee or granted asylum

• Experience with in fusion energy, high‑radiation facilities, or other advanced energy systems
• Experience collaborating with national laboratories, universities, or large multi‑institution technical programs
• Experience establishing engineering standards and improving technical rigor across organizations
• Publication record or recognized technical leadership within the nuclear engineering community

Xcimer offers a comprehensive benefits package designed to support employee health, well‑being, and long‑term success. Benefits include medical, dental, and vision coverage; basic and supplemental life insurance; short‑ and long‑term disability; paid parental leave for employees at the time of birth or adoption; and a 401(k) with a company match of up to 6%. Eligible employees also receive equity, allowing them to share in the company’s long‑term success.

Xcimer operates under a flexible Paid Time Off (ATO) approach. Rather than a fixed number of vacation days, employees are trusted to take the time they need to rest and recharge while meeting the expectations of their role and team. In addition, employees receive paid sick time, 13 company‑paid holidays, and an annual paid company…