Staff Loads & Dynamics 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 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. Radiants 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 Staff Loads & Dynamics Engineer to own and execute structural loads vibration and dynamic analyses for complex mechanical systems associated for Kaleidos the worlds first portable microreactor and supporting hardware. You will play a critical role in ensuring structural integrity and survivability across all phases of the product lifecycle including manufacturing transportation handling deployment and operational environments.

This role requires a hands-on engineer who is comfortable working in ambiguous fast-paced environments and collaborating closely with structures mechanical design thermal nuclear and test teams.

Responsibilities & Duties:

• Develop and own static dynamic and transient loads for reactor systems support structures and transport configurations.

• Perform structural dynamics analyses including modal random vibration shock sine vibration and fatigue assessments.

• Implement explicit dynamics simulations to model nonlinear reactor response under transient seismic and transportation event cases.

• Define and analyze transportation and handling environments including shock and vibration from road rail air or sea transport.

• Generate load cases and environments to support structural sizing design margins and verification plans.

• Conduct finite element analyses (FEA) using tools such as ANSYS Abaqus or similar tools.

• Collaborate with design engineers to influence hardware architecture material selection and joint design.

• Support test planning and correlation including shaker tests modal surveys and structural verification testing.

• Develop and maintain analysis documentation reports and requirements for internal reviews and regulatory interfaces.

• Contribute to failure investigations root cause analyses and design improvements

• Help establish best practices for loads dynamics and structural verification within a growing engineering organization.

Required Qualifications & Skills:

• Bachelors degree in Mechanical Engineering Aerospace Engineering Structural Engineering or a related field.

• 5 years of experience in loads dynamics or structural analysis for complex mechanical systems.

• Strong fundamentals in structural mechanics dynamics and vibration.

• Experience with finite element modeling and analysis of metallic and composite structures.

• Proficiency with industry-standard FEA tools (e.g. ANSYS Abaqus Nastran).

• Familiarity with design allowables safety factors and margin-of-safety methodologies.

• Ability to work cross-functionally and communicate analysis results clearly to both technical and non-technical stakeholders.

Desired Qualifications & Skills:

• Experience in aerospace launch defense nuclear or heavy industrial hardware environments.

• Dynamics modeling software experience (LD-Dyna Abaqus explicit or other).

• Background in shock and vibration testing and test-article correlation.

• Knowledge of fatigue fracture mechanics and bolted joint analysis.

• Experience defining or interpreting environmental specifications and requirements.

• Masters degree or PhD in a relevant engineering discipline.

• Familiarity with nuclear spaceflight or safety-critical system requirements.

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. 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: .

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 applicants capacity to serve in compliance with U.S. export controls.

Required Experience:

Staff IC