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Senior Tooling Engineer

Job in El Segundo, Los Angeles County, California, 90245, USA
Listing for: Radiant Industries
Full Time position
Listed on 2026-01-12
Job specializations:
  • Engineering
    Mechanical Engineer, Manufacturing Engineer
Salary/Wage Range or Industry Benchmark: 60000 - 80000 USD Yearly USD 60000.00 80000.00 YEAR
Job Description & How to Apply Below
Position: Senior Tooling Engineer United States

Radiant is an El-Segundo, CA-based clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years.

Radiant's goal is to bring one of the world's first factory-constructed microreactors to market. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.

Radiant is seeking a highly motivated senior tooling engineer who will be working closely with design engineers and the manufacturing team to develop and innovate custom tooling to build and assemble our microreactor system. You will be part of the early team that develops production tooling for the factory that will mass produce, fuel, and refuel Kaleidos.

Responsibilities and Duties

  • Partner with design and manufacturing engineers to develop innovative production tooling for fabricating and assembling comple x mechanisms and structures.
  • Design, analysis, and fabricate tooling that enables semi- remote operations for fueling/defueling of the reactor.
  • Identify and develop appropriate suppliers for tooling components, fabrication.

Required Skills and Qualifications

  • Bachelor’s degree from an accredited institution in mechanical, manufacturing, or other related engineering discipline.
  • 4+ years of experience in mechanical tooling design and fabrication of multi- component assemblies in CAD (NX or similar).
  • Solid understanding of Geometric Dimensioning & Tolerancing (GD&T) with experience applying it to fabrication drawings.

Desired Skills and Qualifications

  • Master’s degree from an accredited institution in mechanical, manufacturing, or other related engineering discipline.
  • Proficiency with both “hand calc” analytical methods and higher fidelity finite element-based analysis methods.
  • Experience with custom machine design; electromechanical systems, motors, actuators, linear rails, bearings, lifting/rigging, etc.
  • Self-motivated with strong organizational, written, and oral communication skills.
  • Experience with custom machine design; electromechanical systems, motors, actuators, linear rails, bearings, lifting/rigging, etc.
  • Strong problem-solving skills and attention to detail.
  • Demonstrated ability to work collaboratively with design and operations teams.

Additional Requirements

  • Must be willing to work extended hours and weekends as necessary to achieve company goals.
  • Must work 100% onsite at El Segundo HQ.

Total Compensation and Benefits

Radiant's new hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of your interview performance, experience, education, and qualifications.

Benefits and Perks for Eligible Employees:

  • 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.
  • 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.

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.

Unfortunately, we are unable to provide visa sponsorship at this time.

This position involves access to…

Position Requirements
10+ Years work experience
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