Radiant · 2 weeks ago
Senior Mechanical Engineer – Turbomachinery Rotordynamics
El Segundo, CA
Full-time
Onsite
Senior Level
5+ years expRadiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The Senior Mechanical Engineer will be responsible for the power generation and primary cooling turbomachinery of the Kaleidos product, focusing on rotordynamic analysis and bearing selection for high-speed rotating machinery.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
Responsibilities
Design, build, and test turbomachinery for Radiant’s 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
Qualification
Required
Bachelor's or Master's 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
Must be willing to work extended hours and weekends as necessary to accomplish our mission
Must work 100% onsite at El Segundo HQ
Preferred
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
Benefits
Substantial incentive stock plan for all full-time employees.
100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
Sponsored memberships for eligible employees and their dependents.
100% premium coverage for top tier plan + 50% for dependents.
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.
Company
Radiant
Radiant develops portable nuclear microreactors designed to generate electricity and heat in a compact, factory-built form.
51-200 employees
Funding
Current Stage
Late StageTotal Funding
$518.82MKey Investors
Andreessen HorowitzUnion Square Ventures
2025-12-17Series D· $300M
2024-11-14Series C· $165M
2023-04-18Series B· $40M
Leadership Team
Doug Bernauer
Chief Executive Officer
Recent News
2026-01-07
The Motley Fool
2026-01-04
Globe and Mail
2026-01-03
Company data provided by crunchbase