Materials Test Engineer

Responsibilities

• Evaluate, test, and qualify materials and components for structural and functional applications within SPARC and ARC projects
• Own the execution and interpretation of electrical testing across coupon, sub-assembly, and component-level hardware
• Author and maintain materials test specifications, SOPs, and calibration practices for testing equipment and stands
• Design and develop custom electrical characterization test setups, instrumentation, and specialized test fixtures
• Review and report materials property data into version-controlled databases to provide actionable recommendations for design teams
• Support the selection and qualification of composite materials by translating performance requirements into material property specifications
• Collaborate cross-functionally with Safety, R&D, Supply Chain, and Test Validation teams

Requirements

• BS in Materials Science Engineering, Mechanical Engineering, Applied Physics, or a related field
• 5+ years of relevant engineering experience
• Hands-on experience with process-structure-properties fundamentals of engineering composites (e.g., fiber-reinforced polymers)
• Experience in high-voltage and insulation-related testing, including troubleshooting instrumentation and test setups
• Knowledge of Paschen curves, dielectric breakdown mechanisms, and electricity fundamentals
• Proficiency in CAD software (e.g., NX or Solidworks) for designing specialized test fixtures
• Ability to manage multiple concurrent test requests, priorities, and resource estimations independently

Preferred Qualifications

• Experience with electrical testing in extreme environments such as high temperature, cryogenic, or vacuum conditions
• Prior experience authoring internal material specifications or working with international standards (ASTM, ISO, etc.)
• Familiarity with the effects of radiation and plasma on the electrical performance of composite materials

About the Company

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy. Combining decades of research, top talent, and new technologies, we are designing and building commercially viable fusion power plants. As the largest and leading private fusion company in the world, we are working to build the energy industry of the future.