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Marathon Fusion · 2 months ago

Engineering Physics Intern (Summer 2026+)

San Francisco, CA

Internship

Onsite

Intern

$27.88/hr - $40.87/hr

Start in 2026 Summer

Marathon Fusion is a startup focused on developing fuel cycle technologies for fusion energy. They are seeking an Engineering Physics/Experimental Physics Intern to work on experimental design, hardware diagnostics, and contribute to the testing and iteration of core technologies.

Mechanical Or Industrial Engineering

Responsibilities

Experimental Design: Conceptualizing, designing, and setting up experiments to test hardware and measure plasma properties

Hardware and Diagnostics: Designing, building, and characterizing electrical or optical measurement systems and experimental controls

Testing and Iteration: Executing experiments, analyzing data, and contributing to the design iteration of core technologies like the plasma centrifuge and metal foil pump

Qualification

Experimental DesignHardwareDiagnosticsData AnalysisPlasma PhysicsMechanical EngineeringVacuum SystemsExperimental MindsetCommunicationProject Management

Required

Studying physics, but have meaningful hands on experience including in fabrication, mechanical engineering, test engineering, vacuum systems operation, or similar

Studying mechanical engineering, but have had meaningful exposure to physics through coursework, internships, projects or personal study

Studying a combination of both in an engineering physics program, double major or similar

Studying an engineering field or other technical field and have exceptional work-ethic, eagerness to learn, and autonomy

Excellent written and oral communication

Ability to think holistically about systems

Capacity to learn new technical subjects quickly, collaborate cross-functionally, and consider problems from inter-disciplinary perspectives

Organization and project management

A high degree of conscientiousness and integrity

Long-term vision while executing short-term goals

Comfort with the inherent uncertainty of breakthrough technology

Experimental mindset, ability to form and test hypotheses