Senior Mechanical Engineer – Turbomachinery Rotordynamics

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 Mechanical Engineer Turbomachinery Rotordynamics

Radiant is seeking a highly motivated engineer to join the team responsible for the power generation and primary cooling turbomachinery of our Kaleidos product. This role involves performing the rotordynamic analysis and bearing selection of high-speed rotating machinery including compressors turbines and pumps for high-temperature applications. The ideal candidate will have a strong background in rotordynamics and bearing selection along with hands-on experience testing real hardware.

Responsibilities and Duties:

• Design build and test turbomachinery for Radiants power generation systems.
• Perform dynamic analysis of rotor-bearing systems to evaluate vibrational behavior stability and resonance characteristics.
• Conduct critical speed analysis Campbell diagram analysis and stability assessments to optimize rotor system design for minimal vibration and resonance.
• Analyze rotor response under transient operating conditions including startup shutdown and off-design operations.
• Select appropriate bearing types (e.g. rolling element fluid film magnetic) based on operating conditions and performance requirements. Evaluate bearing loads life and thermal performance.
• Prepare technical reports design documentation and presentation materials.
• Support the build and testing of prototype first article and production hardware.

Required Qualifications and Skills:

• Bachelors or Masters degree in Mechanical Engineering or a related field.
• 5 years of experience in the design and analysis of turbomachinery rotating equipment or mechanisms.
• Strong understanding of rotordynamic principles and tools (e.g. XLrotor Dyrobes or equivalent).
• Excellent problem-solving technical communication and organizational skills.

Desired Qualifications and Skills:

• Prior experience with power generation applications.
• Knowledge of bearing selection for high-temperature high-speed applications.
• Hands-on experience with turbomachinery testing and instrumentation.
• Familiarity with relevant industry standards (API ASME ISO).
• Prior nuclear experience is not required for this role.

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.