<div><b style="font-size:16px;">About Commonwealth Fusion Systems: </b></div><div><br></div><div><span style="font-size:16px;">Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.</span></div><div><br></div><div><span style="font-size:16px;">Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And working with policymakers and suppliers to build the energy industry of the future. </span></div><div><br></div><div><span style="font-size:16px;">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.</span></div><div><br></div><div><span style="font-size:16px;">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. </span></div><div><br></div><div><span style="font-size:16px;">If that’s you and this role fits, we want to hear from you.</span></div><div><br></div><div><b style="font-size:16px;">Join the power movement as a Principal Mechanical Engineer</b></div><div><br></div><div><span style="font-size:16px;">We’re looking for a Principal Mechanical Engineer to join our R&amp;D and equipment design team to help build the next generation of thin-film deposition technology. The Principal Mechanical Engineer will be responsible for the design and implementation of advanced R&amp;D equipment and complex machinery.  This role requires strong technical expertise, procedural discipline, and the ability to collaborate across engineering and technology functions to ensure safe, reliable, and high-performance equipment. If you enjoy working on complex design problems, mentoring others, and solving problems in a collaborative, fast-paced environment, this is your opportunity to make an impact.</span></div><br><br><h3>What you'll do:</h3><ul><li>Lead the design and implementation of advanced R&amp;D equipment for thin film processing, including ownership of key mechanical modules and sub-systems</li><li>Define system level requirements and drive innovative design concepts to meet these requirements</li><li>Lead design reviews for overall mechanical system and key mechanical subsystems</li><li>Generate and maintain interfaces with other engineering subsystems</li><li>Report on and be accountable for project progress to stakeholders</li><li>Work effectively within a multi-disciplinary team of top scientists and engineers</li><li>Mentor engineering staff for effectiveness and delivery of on-time &amp; in-spec outcomes</li><li>Get things done: drive projects, consistently deliver, act with speed</li></ul><h3>What we’re looking for:</h3><ul><li>Master’s degree in Mechanical Engineering or related field (or equivalent industrial experience)</li><li>15+ years of experience with at least 7 years of experience working as a principal mechanical design engineer or engineering team lead in a relevant context: design and implementation of R&amp;D systems and manufacturing equipment</li><li>Ability to conceive of novel solutions for complex engineering systems in challenging environments</li><li>Expertise with 3D modeling; preferred experience with SolidWorks and NX</li><li>Experience with COMSOL, ANSYS or other FEA tools</li><li>Ability to select and qualify vendors for components or subsystems</li><li>Demonstrated ability to lead in either direct or matrix structures</li><li>Strong verbal and written communication skills and a dedication to high-quality documentation</li></ul><h3>Bonus points for: </h3><ul><li>Ph.D. in Mechanical Engineering or related field (or equivalent industrial experience)</li><li>Prior success building first-of-kind or experimental tools for material science or semiconductor R&amp;D</li><li>Familiarity in applying Semi-S8, ASME, ACI, ASTM, and other mechanical standards to design solutions</li><li>Experience with the operation of equipment in a manufacturing environment</li></ul><h3>Must-have Requirements: </h3><ul><li>Ability to occasionally lift up to 50 lbs</li><li>Perform activities such as stooping, climbing, standing, or sitting for extended periods of time</li><li>Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics</li><li>Willingness to travel or work required nights/weekends/on-call occasionally</li></ul><br><div><span style="font-size:10px;">#LI-Onsite</span></div><div><br></div><div><span style="font-size:16px;">At 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.</span></div><div><br></div><div><span style="font-size:16px;">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.</span></div><div><br></div><div><b style="font-size:16px;">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.</b></div>

<p>The world needs a fundamentally new source of clean energy to meet our growing energy demands and combat climate change. Scientists have been studying fusion for decades and have made significant progress, but have yet to achieve its potential as a commercial power source. However, its promise has continued to drive interest with the understanding that successfully deployed fusion power would transform the world&rsquo;s energy landscape.</p>
<p>Commonwealth Fusion Systems (CFS) was spun out of MIT's Plasma Science and Fusion Center to leverage the decades of fusion research combined with the innovation and speed of the private sector. Supported by the world&rsquo;s leading investors in breakthrough energy technologies, the CFS team is uniquely positioned to deliver the fastest path to commercial fusion energy. CFS has assembled a world-class team to design and build fusion machines. This team includes experts in magnets, manufacturing, and plasma physics dedicated to the mission of delivering clean, limitless fusion power to the world.</p>

Principal Mechanical Engineer

<div><b>About Commonwealth Fusion Systems:&nbsp;</b></div><div><br></div><div><span>Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.</span></div><div><br></div><div><span>Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And working with policymakers and suppliers to build the energy industry of the future.&nbsp;</span></div><div><br></div><div><span>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.</span></div><div><br></div><div><span>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.&nbsp;</span></div><div><br></div><div><span>If that’s you and this role fits, we want to hear from you.</span></div><div><br></div><div><b>Join the power movement as a Principal Mechanical Engineer</b></div><div><br></div><div><span>We’re looking for a Principal Mechanical Engineer to join our R&amp;D and equipment design team to help build the next generation of thin-film deposition technology. The Principal Mechanical Engineer will be responsible for the design and implementation of advanced R&amp;D equipment and complex machinery.&nbsp; This role requires strong technical expertise, procedural discipline, and the ability to collaborate across engineering and technology functions to ensure safe, reliable, and high-performance equipment. If you enjoy working on complex design problems, mentoring others, and solving problems in a collaborative, fast-paced environment, this is your opportunity to make an impact.</span></div><br><br><h3>What you'll do:</h3><ul><li>Lead the design and implementation of advanced R&amp;D equipment for thin film processing, including ownership of key mechanical modules and sub-systems</li><li>Define system level requirements and drive innovative design concepts to meet these requirements</li><li>Lead design reviews for overall mechanical system and key mechanical subsystems</li><li>Generate and maintain interfaces with other engineering subsystems</li><li>Report on and be accountable for project progress to stakeholders</li><li>Work effectively within a multi-disciplinary team of top scientists and engineers</li><li>Mentor engineering staff for effectiveness and delivery of on-time &amp; in-spec outcomes</li><li>Get things done: drive projects, consistently deliver, act with speed</li></ul><h3>What we’re looking for:</h3><ul><li>Master’s degree in Mechanical Engineering or related field (or equivalent industrial experience)</li><li>15+ years of experience with at least 7 years of experience working as a principal mechanical design engineer or engineering team lead in a relevant context: design and implementation of R&amp;D systems and manufacturing equipment</li><li>Ability to conceive of novel solutions for complex engineering systems in challenging environments</li><li>Expertise with 3D modeling; preferred experience with SolidWorks and NX</li><li>Experience with COMSOL, ANSYS or other FEA tools</li><li>Ability to select and qualify vendors for components or subsystems</li><li>Demonstrated ability to lead in either direct or matrix structures</li><li>Strong verbal and written communication skills and a dedication to high-quality documentation</li></ul><h3>Bonus points for: </h3><ul><li>Ph.D. in Mechanical Engineering or related field (or equivalent industrial experience)</li><li>Prior success building first-of-kind or experimental tools for material science or semiconductor R&amp;D</li><li>Familiarity in applying Semi-S8, ASME, ACI, ASTM, and other mechanical standards to design solutions</li><li>Experience with the operation of equipment in a manufacturing environment</li></ul><h3>Must-have Requirements: </h3><ul><li>Ability to occasionally lift up to 50 lbs</li><li>Perform activities such as stooping, climbing, standing, or sitting for extended periods of time</li><li>Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics</li><li>Willingness to travel or work required nights/weekends/on-call occasionally</li></ul><br><div><span>#LI-Onsite</span></div><div><br></div><div><span>At 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.</span></div><div><br></div><div><span>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.</span></div><div><br></div><div><b>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.</b></div>

Principal Mechanical Engineer

About the Job

About the Company

Commonwealth Fusion Systems (CFS)

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