Radiant · 5 hours ago
Senior Mechanisms Engineer
El Segundo, CA
Full-time
Onsite
Mid, Senior Level
4+ years expRadiant is an El Segundo-based startup building portable nuclear microreactors. They are seeking a highly motivated Senior Mechanisms Engineer to design and develop critical mechanisms within their reactor, Kaleidos, focusing on efficient and reliable mechanisms that control reactivity and safety features.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
Responsibilities
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
Qualification
Required
Bachelor's 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)
Preferred
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
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