Nuclear Engineers jobs in Colorado

Senior Cryogenic Engineer

Xcimer Energy leverages decades of research on Inertial Fusion Energy (IFE) combined with groundbreaking new laser architecture. Our mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. Xcimer has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by leading investors, Xcimer is uniquely positioned to deliver limitless, clean, fusion power to combat climate change.Join us in powering a better world with inertial fusion!

As a Senior Cryogenic Engineer, you will lead the development of deuterium–tritium (DT) fuel handling and target filling capabilities for the Vulcan and Athena programs at Xcimer. This role is critical to enabling reliable, repeatable cryogenic target production and supporting high-repetition-rate experimental campaigns.

You will own the end-to-end design, integration, and operation of DT filling systems, working at the intersection of cryogenics, target fabrication, tritium handling, and experimental operations. We are looking for our engineers to apply their technical expertise, problem solving skills, and dedication to quality to positively impact the future of energy!

Responsibilities

Lead the design and development of deuterium–tritium (DT) fuel filling and cryogenic layering systems for inertial fusion targets
Define system architecture for tritium-compatible cryogenic infrastructure, including storage, transfer, and recovery
Develop processes for repeatable, high-quality DT layer formation and characterization
Integrate fueling systems with target fabrication, handling, and shot operations
Establish procedures for safe handling of tritium in compliance with regulatory and facility requirements
Drive commissioning, testing, and operation of cryogenic systems to support experimental campaigns
Collaborate with target design, theory and computation, experimental teams, and external partnering institutions to define requirements and iterate on designs
Identify and mitigate technical risks associated with cryogenic performance, reliability, and throughput

Qualifications

Education: Degree in mechanical engineering, nuclear engineering or related field
Experience: 8+ years of experience in cryogenic system design and operation
Experience with 3D CAD (NX preferred), FEA, and CFD tools (ANSYS, Altair preferred) for detailed design and analysis
Design experience with hydrogen isotope systems, cryogenic fluid handling systems, or ultra-low temperature systems
Experience working with and around safely with hazardous materials (tritium, isotopes, chemically corrosive materials, etc.)
Experience with precision systems, vacuum environments, and thermal control
Ability to lead complex system development from concept through operation
Creative problem-solver who thrives in fast-paced, dynamic environments
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

Desired

MS in Mechanical Engineering, Nuclear Engineering or related
Familiarity with tritium handling, safety protocols, and regulatory frameworks strongly preferred
Cryogenic target fabrication for inertial confinement fusion (ICF)
DT layering and characterization techniques
High-repetition-rate experimental systems

Candidates may be considered for other positions at Xcimer Energy, and our actual base salary will be determined on an individual basis and may vary based on job-related knowledge and skills, education, and experience. The range is published in accordance with Colorado Equal Pay for Equal Work Act and California Equal Pay Act.

Equal Employment Opportunity

Xcimer Energy is proud to be an Equal Opportunity/Affirmative Action Employer and is committed to attracting, retaining, and developing a highly qualified, diverse, and dedicated work force. Xcimer Energy hires and promotes people on the basis of their qualifications, performance, and abilities. We support the establishment and maintenance of a workplace that fosters trust, equality, and teamwork, in which all employees recognize and appreciate the diversity of individual team members. We provide all qualified applicants for employment and employees with equal opportunities for hire, promotion, and other terms and conditions of employment, regardless of their race, color, religion, gender, sexual orientation, gender identity, national origin/ethnicity, age, physical or mental disability, genetic factors, military/veteran status, or any other status or characteristic protected by federal, state, and/or local law. Xcimer Energy will consider for employment qualified applicants with criminal histories in a manner consistent with applicable federal, state, and local laws. For more information on “EEO Is the Law,” please see here and here.

Benefits

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 shutdown. Benefits are available to regular employees, including part-time and fixed-term roles, as well as interns, with eligibility varying by benefit.

$160,000 - $200,000 a year

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Senior Cryogenic Engineer at XCimer Energy – Denver, Colorado

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