Reactor Operations Enablement Engineer

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028.

Radiant is seeking a Reactor Operations Enablement Engineer to play a critical role in enabling safe, scalable operations for the line of Kaleidos reactors. In this role, you will be responsible for building Reactor Operator training resources to enable timely and effective training and certification of operators. This role goes beyond traditional documentation, requiring close, daily collaboration with operators, engineers, and test teams to rapidly translate emerging system knowledge into clear, actionable content. This role may also support engineering operations through the development of test plans, data reviews, and other key technical documentation needed to move from prototype to commercial deployment.

Responsibilities & Duties:

• Develop and continuously refine Reactor Operator training materials, including operator manuals, learning objectives, lesson plans, operating procedures, and evaluation tools.

• Direct experience with nuclear systems, reactor operations, or operator training programs.

• Maintain records of operator qualification to DOE/NRC standards. Translate evolving reactor designs and operational concepts into clear, concise, and easily understood training content.

• Embed with engineering, test, and operations teams to capture real-time technical insights and lessons learned and reflect them in documentation.

• Establish and maintain documentation standards, templates, and style guides suited for a fast-paced startup environment.

• Manage document lifecycles within configuration-controlled systems, including version control, change tracking, and rapid updates.

• Balance speed and rigor to ensure documentation supports both rapid development and regulatory expectations.

• Capture operational lessons learned and support development of regulatory documents, to include white papers and topical reports.

Required Qualifications & Skills:

• Bachelor’s degree in Engineering, Physics, Technical Communication, or a related technical discipline.

• 2+ years of technical writing experience in a complex, engineering-driven environment (e.g., nuclear, aerospace, energy, or advanced hardware).

• Familiarity with complex systems and the ability to distill them into operator-focused training content through both written and verbal mediums.

• Ability to deliver instructional material in both group and one-on-one classroom environments.

• Ability to read and interpret engineering drawings, specifications and procedures.

• Ability to work with incomplete or evolving technical information and produce clear, accurate documentation.

• Experience developing training materials, technical references, or test documentation.

• Strong collaboration skills and comfort working directly with engineers and operators in a dynamic setting.

• Familiarity with document control and configuration management principles.

Desired Qualifications & Skills:

• Background in instructional design or building technical training programs

• Familiarity with NRC or DOE regulatory instructions and licensing considerations for commercial reactors.

• Ability to operate with a high degree of ownership and autonomy in an evolving organizational structure.

Additional Requirements:

• Must be willing to work extended hours and weekends as necessary to accomplish our mission.

• Must work 100% onsite at El Segundo HQ.

• Stock: Substantial incentive stock plan for all full-time employees.

• Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.

• One Medical: Sponsored memberships for employees and their dependents.

• Vision: 100% top tier plan coverage + 50% for dependents.

• Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.

• Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.

• 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.

• Daily catered lunch. Free snacks and drinks.

• Flexible PTO policy. Remote workday allocation.

• Company and team-bonding events, happy hours and in-person camaraderie.

• Beautiful El Segundo headquarters close to the Pacific Ocean.

Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.
The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: [email protected].
We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.

This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.