2027 New Graduate - Tooling Engineer

About the role

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 five years without refueling. Radiant leverages modern software engineering to rapidly deliver safe, factory‑built microreactors using well‑qualified materials. Founded in 2020, Radiant is testing its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. Radiant is seeking a highly motivated Tooling Engineer to join the team.

Responsibilities

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

Qualifications

• BS or MS in Mechanical Engineering, Manufacturing Engineering, Aerospace Engineering, or a related discipline.
• Graduating in December 2026 or Spring 2027.
• Understanding of both “hand calc” analytical methods and higher‑fidelity finite‑element‑based analysis methods.
• Self‑motivated with strong organizational, written, and oral communication skills.
• Experience with custom machine design, including 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.

Benefits

• Substantial incentive stock plan for all full‑time employees.
• Medical: 100% coverage up to base silver level plan for employee; 50% for dependents; options up to Platinum plans.
• One Medical: Sponsored memberships for employees and 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 offered as employee‑contributed benefits.
• Eight 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 and allocated remote workdays.
• Company and team‑bonding events, happy hours, and in‑person camaraderie.
• Beautiful El Segundo headquarters close to the Pacific Ocean.

Pay

Compensation range: $105,000 – $130,000 base salary, plus equity grants and comprehensive health benefits as part of the total compensation package.