Radiant · 1 day ago
Lead Materials Engineer
El Segundo, CA
Full-time
Onsite
Senior Level, Lead/Staff
5+ years expRadiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. They are seeking a highly motivated Lead Materials Engineer to lead the materials team in the development, testing, and qualification of materials for the Kaleidos 1MW nuclear microreactor.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
Responsibilities
Set the technical direction for the materials team, including the definition of project scopes, the guidance of day-to-day engineering and support activities, and the development of a materials engineering roadmap to support future reactor designs and builds
Accountable for materials engineering team’s technical output
Lead and mentor materials team members technically and professionally
Communicate project status, issues, and schedules to teammates and executives
Present to external stakeholders and regulatory bodies (DOE, NRC)
Review test plans, purchase orders, and analysis
Provide surge materials engineering support as-needed
Manage in-house materials lab, including the identification, procurement, and operation of materials characterization equipment
Create and maintain materials team budget
Oversee materials database and ensure accuracy and data quality of database content
Qualification
Required
Bachelor's degree from an accredited institution in Materials Science and Engineering, or in Mechanical, Aeronautical, Nuclear, or Chemical Engineering with a materials science and engineering focus
5+ years of experience working in the development, testing, and/or analysis of materials for demanding load cases and environments
Hands-on experimental or testing experience in laboratory or production environments
Preferred
Master's or PhD degree from an accredited institution in Materials Science and Engineering, or in Mechanical, Aeronautical, Nuclear, or Chemical Engineering with a materials science and engineering focus
2+ years of engineering leadership and management experience at a company building and/or testing hardware for nuclear, aerospace, or other extreme environments
Expert-level competency in at least one area of materials science, including metallics and structural materials, solid-state processing and/or joining of materials, composites, ceramics, polymers, and/or nuclear materials such as fuel, neutron poisons, or moderators
Experience with development and qualification of material systems for high temperature, irradiation, and/or other extreme environments
Knowledge of standard test methods for materials and experience with development of design allowables
Self-motivated with strong organizational, written, and oral communication skills
Demonstrated ability to work collaboratively with design and operations teams to deliver high-value results
Experience with using text-based software development tools (Python or similar)
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
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