Radiant · 2 days ago
Mechanical Engineer
El Segundo, CA
Full-time
Onsite
Entry, Mid Level
2+ years expRadiant is an El Segundo-based startup focused on developing portable nuclear microreactors. The Mechanical Engineer will be responsible for the design, development, and integration of mechanical systems for the Kaleidos product, involving hands-on mechanical design and analysis in challenging environments.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
Responsibilities
Design, build, and test mechanical components and systems supporting Radiant’s power generation and cooling platforms
Develop detailed mechanical designs for components and assemblies, including structural parts, housings, rotating or moving elements, and interfaces
Perform static and dynamic structural analyses using hand calculations and FEA tools (ANSYS, Abaqus, or equivalent) to evaluate stresses, deformations, and fatigue life
Prepare technical reports, design documentation, and presentation materials to support design reviews and decision-making
Support the build, assembly, and testing of prototype, first-article, and production hardware
Qualification
Required
Bachelor's or Master's degree in Mechanical Engineering or a related field
2+ years of experience in mechanical design and analysis of hardware, components, or mechanical systems
Proficiency in CAD and FEA tools (SolidWorks, ANSYS, Abaqus, or equivalent), including working knowledge of GD&T
Strong problem-solving skills and the ability to clearly communicate technical concepts
Willingness to work extended hours and weekends as necessary to accomplish our mission
Ability to work 100% onsite at Radiant's El Segundo headquarters
Preferred
Experience supporting power, energy, or industrial systems
Knowledge of material selection for high-temperature, high-load, or demanding operating environments
Hands-on experience with mechanical testing, instrumentation, or experimental validation
Exposure to one or more mechanical engineering focus areas such as structures, mechanisms, heat transfer, or dynamics
Familiarity with relevant industry standards (ASME, ISO, API, or similar)
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