Radiant · 5 hours ago
Summer 2026 Internship - Materials Engineer
El Segundo, CA
Internship
Onsite
Intern
Start in 2026 SummerRadiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. They are seeking a highly motivated Materials Engineer Intern to own development, testing, and qualification of materials and related manufacturing processes used in the Kaleidos 1MW nuclear microreactor.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
U.S. Citizen Only
Responsibilities
Plan and execute materials testing to obtain material properties to inform design decisions
Develop and qualify application-specific manufacturing processes related to metals, ceramics, composites, or polymers
Provide expert guidance in materials selection for components within Kaleidos
Identify, procure, and operate equipment for materials characterization and testing
Evaluate data quality and accuracy of material property data for use in company materials database
Define or improve manufacturing processes of components to achieve desired material properties
Qualification
Required
Enrolled in Bachelor's degree from an accredited institution in Materials Science and Engineering, or in Mechanical, Aeronautical, Nuclear, or Welding Engineering with a materials science and engineering focus
Experience working in the development, testing, and/or analysis of materials for demanding load cases and environments from projects, laboratory work, research, internships, or prior work experience
Hands-on experimental or testing experience in laboratory or production environments
Preferred
Enrolled in a Master's or PhD degree from an accredited institution in Materials Science and Engineering, or in Mechanical, Aeronautical, Nuclear, or Welding Engineering with a materials science and engineering focus
Experience with development and qualification of solid-state processing of materials
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.
Company
Radiant
Radiant develops portable nuclear microreactors designed to generate electricity and heat in a compact, factory-built form.
Founded in 2019
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