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Manager, Materials Mechanical Testing

Commonwealth Fusion Systems
Devens, MA Full Time
POSTED ON 3/6/2026
AVAILABLE BEFORE 5/5/2026
About Commonwealth Fusion Systems: 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’re designing and building commercially viable fusion power plants. And we're working with policymakers and suppliers to build the energy industry of the future. We’re in the best position to make it happen. Since 2018, we’ve raised nearly $3 billion in capital, making us the largest and leading private fusion company in the world.Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team. If that’s you and this role fits, we want to hear from you.Join the power movement as Manager, Materials Mechanical TestingThe Materials and Processing (M&P) Department at CFS supports design engineers, supply chain, and manufacturing by selecting materials, unambiguously defining materials and processing routes, validating and measuring those materials and their properties, and conducting R&D to develop new materials and processes to enable fusion power deployment. M&P at CFS is organized around three primary thrusts: engineering, test and characterization, and development programs. The work is undertaken in support of delivering SPARC, the net energy tokamak under construction in Devens, MA, and ultimately in designing the ARC fusion power plant. These devices pose unique materials challenges including neutron fluxes produced by deuterium-tritium fusion, high heat loads, molten salt coolant systems, complex component topologies, high magnetic fields, and high mechanical loading in cryogenic conditions. To support this mission, the CFS Materials Test and Characterization team in M&P is seeking a sub-team lead for the growing group. The manager of the materials mechanical testing team will mentor, coordinate, and grow a team of 2-5 materials test engineers in addition to serving as subject matter expert in mechanical testing of materials and structural testing of sub-components in CFS projects.What you'll do:Mentor, coordinate, and line manage a small team of materials test engineers that conduct evaluation, testing and qualification of materials and components for structural and functional applications for CFS projectsMaintain and grow CFS cultural values of integrity, self-critique, impact, and execution while supporting and growing team membersServe as a subject matter expert and individual contributor in one or more of the following areas:➢ Mechanical testing of materials➢ Test design and development➢ Structural testing➢ Mechanical design for test fixture developmentCreate educational resources, guidance documentation, and process flows for the team and broader department audienceProvide technical guidance to project team members to ensure efficient execution of design-build-test-learn cycles and retirement of technical risks by translating performance requirements into material property specificationsRepresent CFS Materials Test & Characterization in TRRs, design and manufacturing reviewsReport on team activities and successesEnsure efficient and timely transfer of test data and new insights to engineering design teamsPromote a safety-oriented work culture and comply with all CFS guidelines and policiesWork closely with other CFS teams including:➢ Safety team to manage chemical/mechanical/environmental hazards in existing and new tests being developed➢ Adjacent R&D teams to optimally share pooled resources including equipment and personnel➢ Supply chain team to procure new equipment and materialsWhat we’re looking for:BS in Mechanical Engineering or related field 3-5 years experience with some technical lead responsibilityExperience with materials laboratory failure analysisExperience conducting and understanding standard mechanical property testingExperience conducting structural testing of assemblies and prototype componentsUnderstanding of how materials properties impact performanceDesign of experimentsData analysis, interpretation, and visualizationStrong knowledge in CAD (NX, Solidworks, AutoCAD, etc.)Knowledge of process-structure-property relationships in materials and relevant manufacturing processesExperience with lab management / test schedulingExperience delegating complex tasks to operating teamsEfficient and effective technical communication skills targeted at a variety of audiencesA strong drive for quality and attention to detailAbility to communicate with a wide range of technical and non-technical audiencesAbility to clearly express and critique ideasAbility to rapidly execute short turnaround engineering/R&D tasksStrong problem solving skills, ability to approach new problems with creativityResource estimation and projectionBonus points for:Understanding and experience testing materials in various environments including extreme temperature and high vacuum applicationsExperience developing novel testing methodsExperience documenting processesExperience with project managementMust-have Requirements:Perform activities such as typing or sitting for extended periods of timeWork in a facility that contains industrial hazards including heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, metallographic etchants and cryogenicsWillingness to travel or work required nights/weekends/on-call occasionallySalary range for this full-time position equity benefits. The actual salary will depend on level, location, qualifications, and experience. The range displayed on each job posting reflects new hire salaries for the position across all US locations. Benefits include:•  Competitive compensation with equity•  13 Company-wide Holidays•  Flexible vacation days•  10 sick days•  Generous parental leave policy•  Health, dental, and vision insurance•  401(k) with employer matching•  Professional growth opportunities•  Team-building activities#LI-HybridAt CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. As we grow, we’re eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless 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.This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively, “Export Control Laws"). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.

Salary : $80,000 - $100,000

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