Senior Mechanisms Engineer

Radiant is an El Segundo CA-based startup building the worlds first mass-produced portable nuclear microreactors. The companys first reactor Kaleidos is a 1-megawatt failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. 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. Radiants unique practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe factory-built microreactors that leverage existing well-qualified materials. Founded in 2020 Radiant is on track to test its first reactor next year at the Idaho National Laboratory with initial customer deliveries beginning in 2028.

Senior Mechanisms Engineer

Radiant is seeking a highly motivated Senior Mechanisms Engineer to design and develop critical mechanisms within Kaleidos. You will solve unique challenges creating efficient and reliable mechanisms that control reactivity or actuate critical safety features. You will be responsible for the following: trade studies material selection detailed structural analysis assembly integration and testing. You will have an instrumental impact of fueling the first new commercial reactor design in over 50 years by 2026.

Responsibilities & Duties:

• Ownership of critical mechanisms such as the control blade actuator or air jacket valves.
• Conduct trade studies and develop designs to meet program requirements.
• Perform detailed thermomechanical analysis (static strength durability/fatigue) and kinematic analysis to determine structural integrity and performance margins using both hand calculations and finite element tools.
• Develop and execute manufacturing/assembly instructions and test plans.
• Create and manage a Bill-Of-Materials (BOM).
• Find and develop suppliers for components.
• Own subassembly design manufacturing and test schedules.
• Own risk analysis (FMEA) for subsystems.
• Collect requirements provide expertise and feedback to engineers in other functional areas via clear constructive communication.

Required Qualifications & Skills:

• Bachelors degree from an accredited institution in Mechanical or Aeronautical Engineering.
• 4 years of experience designing mechanisms.
• 4 years of experience performing stress analysis using both hand calculations and finite element tools (Abaqus Ansys FEMAP or similar).

Desired Qualifications & Skills:

• Experience with design of multi-component assemblies in CAD (NX or similar).
• Experience designing hardware that was manufactured deployed and iteratively improved.
• Experience designing pneumatic systems.
• Experience integrating electromechanical components such as motors or encoders.
• Experience working with interdisciplinary teams.
• Solid understanding and application of GD&T.
• Proficiency with both hand calc analytical methods and higher fidelity finite element-based analysis methods.
• Ability to derive free-body diagrams for systems with which one was not previously familiar.
• Self-motivated with strong organizational written and oral communication skills.
• Experience with using text-based software development tools.

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.

Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiants 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 todays advanced reactor builders dont wait for job postings. They join the winning team. If thats you contact us directly for immediate opportunities: .

Benefits and Perks for Eligible Employees:

• Stock: Substantial incentive stock plan for all full-time employees.
• Medical: 100% premium coverage for base Silver level plan for employee 50% premium coverage for dependents. Platinum plans available.
• One Medical: Sponsored memberships for eligible employees and their dependents.
• Vision: 100% premium coverage for top tier plan 50% for dependents.
• Dental: 100% premium coverage for top tier plan (including orthodontia) 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.

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 technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicants capacity to serve in compliance with U.S. export controls.