Radiant · 2 hours ago
Senior Mechanical Engineer (Structures)
El Segundo, CA
Full-time
Onsite
Senior Level
6+ years expRadiant is a startup based in El Segundo, CA, focused on developing portable nuclear microreactors. The Senior Mechanical Engineer (Structures) will design and develop critical structures for the Kaleidos reactor, addressing unique challenges related to fission and extreme environments.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
U.S. Citizen Only
Responsibilities
Ownership of critical structures such as mass-efficient transportable shielding systems, container system, and high temperature graphite and metallic systems
Conduct trade studies and develop designs to meet program requirements
Perform detailed thermomechanical analysis (static strength, durability/fatigue) and dynamic analysis (vibration, shock) to determine structural integrity (margins of safety) 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, Aeronautical, Civil or Structural Engineering
6+ years of experience designing structures
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 resolving thermal expansion issues in designs
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
alleywatch.com
2025-12-24
2025-12-19
Company data provided by crunchbase