About Marathon Fusion

Marathon Fusion is building the engineering technologies needed to scale fusion from breakeven experiments into real power plants. While much of the industry is focused on proving new fusion devices, our focus is on the practical systems that will make fusion deployable at climate-relevant scale.

We develop core fuel cycle and plant-level technologies for stable isotope production, fuel cycle closure, and advanced blanket systems that enable both energy generation and high-value co-products.

Founded in 2023, Marathon Fusion is building the components and systems that will help fusion become a practical, abundant, and reliable energy source for the 21st century.

Culture at Marathon Fusion

We are a startup environment characterized by a need for focus, adaptability and prioritization in a shifting landscape. Thriving in this environment requires excellent proactive communication across roles and backgrounds, the ability to build and maintain trust between team members, and the willingness to learn and develop new skills on the job. We place particularly high weight on each team member's ability to be self-directed.

Application Deadline: May 13, 2026

About the Role

As a Laboratory Manager Intern, your work will sit at the heart of our experimental work by supporting ongoing research, maintaining a highly organized and productive workspace, and helping our engineering and research teams move faster by keeping tools, components, and experimental setups ready to use.

You will create and maintain organizational systems for lab equipment and materials, assist with the preparation and teardown of experiments and test assemblies, and help catalog and manage inventory, including selling excess equipment where needed. This position is ideal for an ambitious college student or new grad with an interest in experimental science or startups. As a member of a small team, you’ll get to see cutting-edge fusion research up close and be part of an evolving field in clean energy development.

What You’ll Do

• Lab Organization and Operations: Develop and maintain systems to organize tools, components, and experimental hardware across the lab and broader facility.

• Experimental Support: Help engineering and physics teams prepare, assemble, and dismantle test assemblies and experimental setups, including basic fabrication or component preparation where needed.

• Equipment and Inventory Management: Maintain inventory of technical equipment and components, including logging new items, tracking usage, and supporting simple refurbishment or coordination with external vendors for maintenance and repairs.

• Surplus and Asset Management: Build and operate an inventory system to identify, list, and help offload excess or unused equipment.

• Cross-Team Collaboration: Work closely with experimentalists and engineers across several teams, understanding their short- and mid-term needs, and proactively ensuring the lab environment supports ongoing and upcoming work.

For all positions at Marathon, we look for individuals who have:

• Ability to think holistically about systems and act proactively rather than reactively.

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

• A high degree of conscientiousness, integrity, and follow-through.

• Comfort with the inherent uncertainty of breakthrough technology and a rapidly changing startup environment.

• Experimental mindset - ability to form and test hypotheses, proposing creative solutions.

Marathon Fusion considers all qualified applicants equally for employment. We do not discriminate on the basis of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law, ordinance, or regulation.