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Radiant Nuclear Jobs (NOW HIRING)

Radiant

Senior Nuclear Thermal-Hydraulics Engineer

El Segundo, CA · On-site

$111K - $152K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

About Radiant 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 ...

Radiant

Senior Nuclear Thermal-Hydraulics Engineer

El Segundo, CA · On-site

$139K - $196K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

About Radiant 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 ...

Radiant Industries, Inc.

Senior Nuclear Engineer

El Segundo, CA · On-site

$150 - $210/hr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

About Radiant 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 ...

Cantos Ventures

Nuclear Engineer

El Segundo, CA · On-site

$106.50 - $146.48/hr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

Location El Segundo HQ Employment Type Full time Location Type On‑site Department Engineering Nuclear Engineering Compensation * $106,500 - $146,475 • Offers Equity Nuclear Engineer Radiant is ...

Radiant

Strategic Sourcing Manager

El Segundo, CA · On-site

$85K - $168K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Supply Reliability Engineer

El Segundo, CA · On-site

$109K - $137K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Supply Reliability Engineer

El Segundo, CA · On-site

$133K - $190K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Risk & Compliance Lead

El Segundo, CA · On-site

$115K - $168K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Senior Technical Talent Sourcer

El Segundo, CA · On-site

$115K - $168K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Media Relations Director

El Segundo, CA · On-site

$154K - $256K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Engineering Manager, Electronics

El Segundo, CA · On-site

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Supplier Quality / Development Engineer

El Segundo, CA · On-site

$133K - $190K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Senior Electrical Engineer

El Segundo, CA · On-site

$158K - $219K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Regulatory Program Manager

El Segundo, CA · On-site

$186K - $258K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Engineering Manager, Electronics

El Segundo, CA · On-site

$208K - $284K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

Radiant

Senior Reactor Operations Engineer

El Segundo, CA · On-site

$133K - $184K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • PTO

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.

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How much do radiant nuclear jobs pay per hour?

As of Aug 20, 2026, the average hourly pay for radiant nuclear in the United States is $51.91, according to ZipRecruiter salary data. Most workers in this role earn between $39.18 and $62.50 per hour, depending on experience, location, and employer.

What is a radiant nuclear?

A Radiant Nuclear job typically involves working with advanced nuclear technologies, focusing on safe and efficient energy production. Roles may include reactor operation, radiation safety, regulatory compliance, and research into next-generation nuclear reactors. Professionals in this field often have backgrounds in nuclear engineering, physics, or related disciplines. The job may also involve maintaining and optimizing nuclear systems for sustainable energy solutions.

What are the key skills and qualifications needed to thrive in the radiant nuclear position, and why are they important?

To excel as a Radiant Nuclear Engineer, you typically need a strong background in nuclear engineering, radiation physics, and safety protocols, usually supported by a relevant engineering degree and certification. Familiarity with specialized nuclear instrumentation, radiation detection equipment, and regulatory compliance systems is essential. Excellent problem-solving abilities, attention to detail, and effective teamwork are valuable soft skills in this role. These capabilities ensure safe operations, regulatory compliance, and successful collaboration in high-stakes nuclear environments.

What are the typical work environments for radiant nuclear professionals, and how do they collaborate with other teams?

Radiant Nuclear professionals often work in power plants, research labs, or industrial facilities where they ensure the safe and efficient use of nuclear technologies. Their responsibilities usually involve close collaboration with engineers, health physicists, safety inspectors, and operations staff to maintain safety standards and respond to technical challenges. They may participate in multi-disciplinary project teams, routinely attend safety briefings, and work with regulatory agencies to ensure compliance. These team interactions foster a culture of safety and innovation, making communication skills and teamwork vital for success in the role.

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Infographic showing various Radiant Nuclear job openings in the United States as of August 2026, with employment types broken down into 2% As Needed, 79% Full Time, 9% Part Time, and 10% Contract. Highlights an 92% Physical, 3% Hybrid, and 5% Remote job distribution, with an average salary of $107,964 per year, or $51.9 per hour.

Senior Nuclear Thermal-Hydraulics Engineer

Radiant

El Segundo, CA • On-site

$111K - $152K/yr

Other

Medical, Dental, Vision, Life, PTO

Posted 27 days ago

Job description

About Radiant
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.
About the Role
Radiant is seeking a Senior Nuclear Thermal-Hydraulics Engineer to lead thermal-hydraulics and coupled physics analysis for the Kaleidos microreactor. You will own the modeling that determines how heat, coolant, and reactor core behavior interact under normal and accident conditions - work that directly informs core design, cooling systems, and safety case development for the first mass-produced nuclear reactor. This role is suited to engineers with reactor-specific thermal-hydraulics or coupled multiphysics experience who want to apply that depth to a fast-moving, factory-built reactor program.
Responsibilities & Duties
  • Own and execute thermal-hydraulics analysis to evaluate design and safety performance of Kaleidos reactor systems under normal and accident conditions.
  • Develop and apply coupled physics models integrating thermal-hydraulics with neutronics and/or structural response.
  • Identify and implement best practices for reactor thermal-hydraulics and systems-code analysis.
  • Build automated workflows to expand simulation capabilities, accuracy, and efficiency.
  • Collaborate across reactor physics, mechanical, and safety teams to support licensing and design trade studies.

Required Qualifications & Skills
  • Bachelor's degree in nuclear engineering, mechanical engineering, physics, or similar field from an accredited institution.
  • 5+ years of relevant industry or national laboratory experience.
  • Experience with thermal-hydraulics analysis and/or reactor systems codes (e.g., RELAP5, TRACE, CTF/COBRA-TF, SAM, TRANSFORM).
  • Experience with high-temperature (500 F+) heat transfer analysis involving conduction, convection, and radiation.
  • Experience communicating and distilling technical information with cross-functional teams.

Desired Qualifications & Skills
  • Experience with coupled multiphysics modeling (e.g., MOOSE, BISON, MARMOT) or neutronics coupling.
  • Experience with commercial CFD/FEA tools (STAR-CCM+, Ansys Fluent) and CAD (Siemens NX).
  • Prior experience at a national laboratory, reactor vendor, or advanced reactor developer.
  • Driven, self-motivated, and takes ownership of work end to end.

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.
Benefits and Perks
  • 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:
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.

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