{"schemaVersion":"jobsearcher.job.v1","id":"cb4ee44367b45bb2c56ac2c7","url":"https://jobsearcher.com/jobs/cb4ee44367b45bb2c56ac2c7","canonicalUrl":"https://jobsearcher.com/jobs/cb4ee44367b45bb2c56ac2c7","title":"Senior Mechanical Engineer","description":"About Commonwealth Fusion Systems:\n\nCommonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.\n\nCombining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. We’re working with policymakers and suppliers to build the energy industry of the future.\n\nWe’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.\n\nNow 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.\n\nIf that’s you and this role fits, we want to hear from you.\n\nSenior Mechanical Engineer\nWe are seeking a highly motivated and experienced Mechanical Engineer to join our manufacturing team. In this role, you will be responsible for providing technical expertise during the commissioning, implementation, and integration of manufacturing equipment. You will work closely with our production team to ensure that our manufacturing processes are optimized for efficiency, quality, and safety.\n\nWhat you’ll do\n\nProvide technical expertise during the commissioning, implementation, and integration of manufacturing equipment\n\nSupport Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) of equipment\n\nTroubleshoot mechanical issues and provide solutions to ensure equipment operates efficiently\n\nCollaborate with production and engineering teams to optimize manufacturing processes and improve equipment performance\n\nDrive continuous improvement initiatives for manufacturing equipment to increase efficiency, reduce downtime, and improve quality\n\nConduct root‑cause analysis and implement corrective actions to resolve manufacturing issues\n\nEnsure compliance with all safety requirements\n\nWork with external vendors and suppliers to ensure the timely delivery of equipment and materials\n\nConceptualize and detail new manufacturing equipment for scaled‑up manufacturing processes\n\nRun experiments to determine the feasibility of new manufacturing processes and translate those learnings into practical designs\n\nWhat we’re looking for\n\nBachelor’s degree in Mechanical Engineering or a related field\n\n7+ years of experience in mechanical engineering, with a focus on manufacturing equipment\n\n5+ years of manufacturing equipment and tooling design\n\nStrong knowledge of mechanical systems, including hydraulics, pneumatics, and motion control\n\nExperience with 3D CAD packages and 2D drawings\n\nExperience with Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) of equipment\n\nUnderstanding of GD&T and its application\n\nExcellent problem‑solving and analytical skills\n\nStrong communication and interpersonal skills, with the ability to collaborate effectively with cross‑functional teams\n\nExperience with commissioning and startup of manufacturing equipment\n\nBonus points for\n\nStrong knowledge of mechanical systems, including hydraulics, pneumatics, and motion control\n\nExperience developing manufacturing equipment and tooling for a novel process\n\nExperience with production ramp‑up and optimization of manufacturing processes\n\nExperience with automated equipment and robotics\n\nMust‑have requirements\n\nAbility to lift up to 50 lbs occasionally\n\nPerform activities such as typing, standing, stooping, and sitting, for extended periods of time\n\nWillingness to occasionally travel or work required nights, weekends, or on‑call\n\nDedication to safety to mitigate hazards that may include heat, cold, noise, fumes, strong magnets, lead, high voltage, and cryogenics\n\n$110,000 - $185,000 a year\n\nCompetitive compensation with equity\n\n13 Company‑wide Holidays\n\nFlexible vacation days\n\n10 sick days\n\nGenerous parental leave policy\n\nHealth, dental, and vision insurance\n\n401(k) with employer matching\n\nProfessional growth opportunities\n\nTeam‑building activities\n\n#LI-Onsite\n\n#CFS-EX\n\nAt 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.\n\nWe 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.\n\nThis 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.\n\n#J-18808-Ljbffr","company":"Commonwealthfusionsystems5","rawCompany":"commonwealthfusionsystems5","city":"Harvard","state":"MA","isRemote":false,"isActive":false,"createdAt":"2026-06-17T04:22:28.156Z","occupations":[{"code":"17-2141.00","title":"Mechanical Engineers","slug":"mechanical-engineers"},{"code":"17-2199.00","title":"Engineers, All Other","slug":"engineers-all-other"},{"code":"17-3027.00","title":"Mechanical Engineering Technologists and Technicians","slug":"mechanical-engineering-technologists-and-technicians"}],"industries":[{"code":"333248","title":"All Other Industrial Machinery Manufacturing","slug":"all-other-industrial-machinery-manufacturing"},{"code":"333998","title":"All Other Miscellaneous General Purpose Machinery Manufacturing","slug":"all-other-miscellaneous-general-purpose-machinery-manufacturing"},{"code":"541330","title":"Engineering Services","slug":"engineering-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Senior Mechanical Engineer","description":"About Commonwealth Fusion Systems:\n\nCommonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.\n\nCombining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. We’re working with policymakers and suppliers to build the energy industry of the future.\n\nWe’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.\n\nNow 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.\n\nIf that’s you and this role fits, we want to hear from you.\n\nSenior Mechanical Engineer\nWe are seeking a highly motivated and experienced Mechanical Engineer to join our manufacturing team. In this role, you will be responsible for providing technical expertise during the commissioning, implementation, and integration of manufacturing equipment. You will work closely with our production team to ensure that our manufacturing processes are optimized for efficiency, quality, and safety.\n\nWhat you’ll do\n\nProvide technical expertise during the commissioning, implementation, and integration of manufacturing equipment\n\nSupport Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) of equipment\n\nTroubleshoot mechanical issues and provide solutions to ensure equipment operates efficiently\n\nCollaborate with production and engineering teams to optimize manufacturing processes and improve equipment performance\n\nDrive continuous improvement initiatives for manufacturing equipment to increase efficiency, reduce downtime, and improve quality\n\nConduct root‑cause analysis and implement corrective actions to resolve manufacturing issues\n\nEnsure compliance with all safety requirements\n\nWork with external vendors and suppliers to ensure the timely delivery of equipment and materials\n\nConceptualize and detail new manufacturing equipment for scaled‑up manufacturing processes\n\nRun experiments to determine the feasibility of new manufacturing processes and translate those learnings into practical designs\n\nWhat we’re looking for\n\nBachelor’s degree in Mechanical Engineering or a related field\n\n7+ years of experience in mechanical engineering, with a focus on manufacturing equipment\n\n5+ years of manufacturing equipment and tooling design\n\nStrong knowledge of mechanical systems, including hydraulics, pneumatics, and motion control\n\nExperience with 3D CAD packages and 2D drawings\n\nExperience with Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) of equipment\n\nUnderstanding of GD&T and its application\n\nExcellent problem‑solving and analytical skills\n\nStrong communication and interpersonal skills, with the ability to collaborate effectively with cross‑functional teams\n\nExperience with commissioning and startup of manufacturing equipment\n\nBonus points for\n\nStrong knowledge of mechanical systems, including hydraulics, pneumatics, and motion control\n\nExperience developing manufacturing equipment and tooling for a novel process\n\nExperience with production ramp‑up and optimization of manufacturing processes\n\nExperience with automated equipment and robotics\n\nMust‑have requirements\n\nAbility to lift up to 50 lbs occasionally\n\nPerform activities such as typing, standing, stooping, and sitting, for extended periods of time\n\nWillingness to occasionally travel or work required nights, weekends, or on‑call\n\nDedication to safety to mitigate hazards that may include heat, cold, noise, fumes, strong magnets, lead, high voltage, and cryogenics\n\n$110,000 - $185,000 a year\n\nCompetitive compensation with equity\n\n13 Company‑wide Holidays\n\nFlexible vacation days\n\n10 sick days\n\nGenerous parental leave policy\n\nHealth, dental, and vision insurance\n\n401(k) with employer matching\n\nProfessional growth opportunities\n\nTeam‑building activities\n\n#LI-Onsite\n\n#CFS-EX\n\nAt 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.\n\nWe 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.\n\nThis 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.\n\n#J-18808-Ljbffr","datePosted":"2026-06-17T04:22:28.156Z","dateModified":"2026-06-17T04:22:28.156Z","hiringOrganization":{"@type":"Organization","name":"Commonwealthfusionsystems5","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Harvard","addressRegion":"MA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"cb4ee44367b45bb2c56ac2c7"},"url":"https://jobsearcher.com/jobs/cb4ee44367b45bb2c56ac2c7"}}