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Materials Engineer, Shielding Materials

Radiant is an El Segundo-based clean energy startup developing the Kaleidos 1MW microreactor — a portable, zero-emissions power source for remote and critical applications. We are seeking a motivated Materials Engineer to own development, testing, and qualification of radiation shielding materials and related manufacturing processes, contributing cross-functionally to bring the world's first mass-produced microreactor to market.

Skills

  • Materials selection and characterization
  • Radiation shielding materials knowledge
  • Hands-on laboratory and production testing experience
  • Manufacturing process development (mixing, forming, curing, coating)
  • Materials data analysis and quality evaluation
  • Familiarity with composites, concrete, or ceramic matrix materials
  • Experience with materials test standards and design allowables
  • Proficiency with text-based software tools (Python or similar)

Responsibilities

  • Own end-to-end development and qualification of radiation shielding materials for Kaleidos and related applications.
  • Plan and execute materials characterization and testing to determine properties and inform design decisions.
  • Provide expert guidance on selection, design, and use of materials to mitigate neutron, gamma, and other radiation.
  • Identify, procure, and operate characterization and testing equipment; ensure data quality and integrity.
  • Define and improve manufacturing processes (mixing, forming, curing, coating, etc.) to meet material property targets.
  • Evaluate material property data for inclusion in the company materials database and support design allowables.
  • Collaborate with design and operations teams to integrate materials solutions into reactor components.

Education

  • Bachelor’s in Materials Science & Engineering or related engineering degree with materials focus (required)
  • Master’s or PhD in Materials Science & Engineering or related field (preferred)

Benefits

  • Substantial incentive stock plan for full-time salaried employees
  • Medical: employer-covered up to base silver for employee, partial dependent coverage; plans up to Platinum
  • Sponsored One Medical memberships for employees and dependents
  • Vision: top tier plan coverage for employee, partial for dependents
  • Dental: top tier plan coverage for employee, partial for dependents (orthodontia extra)
  • Voluntary benefits: Life, Accident, Hospital, Critical Illness, Commuter, FSA
  • Free snacks and drinks onsite
  • Flexible PTO policy
To read the complete job description, please click on the ‘Apply’ button

Average salary estimate

$135000 / YEARLY (est.)
min
max
$110000K
$160000K

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MATCH
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FUNDING
DEPARTMENTS
SENIORITY LEVEL REQUIREMENT
TEAM SIZE
No info
HQ LOCATION
No info
SALARY RANGE
$110,000/yr - $160,000/yr
EMPLOYMENT TYPE
Full-time, onsite
DATE POSTED
August 20, 2025
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