Join Radiant as a Materials Engineer to develop and qualify materials for the world's first mass-produced nuclear microreactor.
Posted by employer 8 hours ago
First seen on Joblaze 3 hours ago
Last verified on the company career page 3 hours ago
What you'll build
- Plan and execute materials testing
- Develop and qualify manufacturing processes
- Provide guidance in materials selection
- Lead R&D efforts for materials
- Evaluate data quality of material property data
Must have
- Bachelor’s degree in Materials Science and Engineering or related field
- 2+ years of experience in materials development or testing
- Hands-on experimental or testing experience
Nice to have
- Master’s or PhD degree in relevant field
- Experience with nuclear materials for high temperature
- Knowledge of standard test methods for materials
Requirements
- Experience
- 2+ years
- Education
- Bachelor's degree
Not disclosed in this posting: compensation, visa sponsorship.
Benefits
Joblaze summary
In this role, the Materials Engineer will focus on the development, testing, and qualification of materials used in the moderator and reflector components of Radiant's nuclear microreactor, Kaleidos. Key skills include materials selection, hands-on testing experience, and familiarity with advanced manufacturing processes. This position is suited for candidates with a background in materials science or engineering, ideally with experience in high-temperature and irradiation environments. Radiant's startup environment emphasizes cross-functional collaboration and rapid innovation in nuclear technology.
Joblaze insights
- Listed today — first seen on Joblaze October 21, 2026. Last confirmed on Radiant's careers page October 21, 2026.
Quick facts
- Is the Materials Engineer, Moderator Materials role remote?
- No — this is an on-site role in El Segundo, CA, United States.
- How much experience is required?
- At least 2 years of relevant experience for this Materials Engineer, Moderator Materials role.
- Where is the role based?
- Radiant is hiring for this position in El Segundo, CA, United States.
- What seniority level is this role?
- Radiant targets mid-level candidates for this position.
- Is this full-time or contract?
- Full-time for this Materials Engineer, Moderator Materials role at Radiant.
From the original posting
About the Role
Radiant is seeking a highly motivated Materials Engineer to own development, testing, and qualification of in-core moderator and reflector materials and related manufacturing processes used for the Kaleidos 1MW nuclear microreactor. The ideal candidate takes great ownership of their work end-to-end, is proficient in materials selection, testing, and analysis, and is excited to work in a highly cross-functional, fast-paced environment. You will be a key contributor to building the world's first mass-produced, rapidly-deployable nuclear reactor.
Responsibilities & Duties
Plan and execute materials testing to obtain material properties to inform design decisions.
Develop and qualify application-specific manufacturing processes such as graphitization, hot isostatic pressing, extrusion, etc.
Provide expert guidance in materials selection for moderator and reflector components within Kaleidos.
Lead R&D efforts for advanced moderator and reflector materials.
Develop and execute test campaigns to qualify moderator and reflector materials using in-house materials testing and characterization equipment as well as coordination with outside labs and vendors.
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.
Required Qualifications & Skills
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.
2+ 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
Desired Qualifications & Skills
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.
Experience with development and qualification of nuclear moderator and reflector materials for high temperature and irradiation 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 and Perks
Stock: Substantial incentive stock plan for all full-time employees.
Daily catered lunch. Free snacks and drinks.
Flexible PTO policy. Remote workday allocation.
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