Senior Nuclear Criticality Safety Engineer (Nuclear Fuel Recycling)

Location: Santa Clara, California, or remote within the United States. Remote employees must travel to the Santa Clara headquarters twice per quarter based on business or team needs, and must work onsite there during the first two weeks of onboarding. Applicants must meet the definition of a U.S. person under applicable export control laws.

Salary: $135,000–$175,000 per year

Company

hirify.global develops fast fission power plants, nuclear fuel recycling technologies, and domestic supply chains for critical radioisotopes to deliver clean and reliable energy.

What you will do

• Identify and evaluate nuclear criticality safety hazards for fuel cycle facilities.
• Perform criticality safety evaluations demonstrating subcriticality under normal and credible abnormal conditions.
• Develop criticality code validation reports and document hazard analyses, evaluations, and supporting technical information.
• Demonstrate compliance with the double-contingency principle and implement controlled parameters for the nuclear criticality safety program.
• Develop the criticality accident alarm system and inadvertent criticality emergency response plan.
• Support safety basis development, licensing efforts, and administration of nuclear criticality safety methodologies and management measures.

Requirements

• Bachelor’s, master’s, or PhD in nuclear engineering, chemical engineering, chemistry, or a related field.
• At least 5 years of experience performing criticality safety evaluations as part of a nuclear facility safety basis.
• Knowledge of nuclear science, criticality physics, chemistry, nuclear fuel cycle processes, and fuel cycle facility accident scenarios.
• Proficiency with Attila4MC, MCNP, SCALE, and/or Serpent codes and modules.
• Knowledge of criticality-specific codes, standards, regulatory requirements, and industry practices, including relevant NUREG and NRC guidance.
• Must meet the definition of a U.S. person under applicable U.S. export control laws.

Nice to have

• Knowledge of used nuclear fuel recycling technologies.
• 10 or more years of experience performing criticality safety evaluations for an NRC-licensed fuel cycle facility.
• Familiarity with critical experiments and their purpose.
• Knowledge of structural design, analysis, and construction.

Culture & Benefits

• Fast-paced, highly iterative startup environment with substantial autonomy and open-ended technical challenges.
• Collaborative culture focused on shared ownership, humility, creativity, and solving complex problems.
• Flexible time off, flexible work hours, equity, competitive pay, 401(k), health insurance, and FSA.
• Remote work is available with required headquarters travel and in-person onboarding.