Summer Internship - Materials Engineer

Internship Summer 2026 - Materials Engineer Radiant is 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.

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 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.

Required Qualifications & Skills * 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 Desired Qualifications & Skills * 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). Additional Requirements: * This internship will require working onsite at our El Segundo HQ.

* You may be asked to work extended hours or weekends occasionally to support project goals.