Mechanical Engineer
Devens, MAFull TimePosted Oct 28, 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, suppliers, and many others to build the energy industry of the future.
We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading 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 a Mechanical Engineer
We 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. Additionally, this position requires coverage or partial coverage for the second shift, as well as support for Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) of equipment.
#LI-Onsite
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.
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.
What you'll do:
- Provide technical expertise during the commissioning, implementation, and integration of manufacturing equipment
- Support Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) of equipment
- Troubleshoot mechanical issues and provide solutions to ensure equipment operates efficiently
- Collaborate with production and engineering teams to optimize manufacturing processes and improve equipment performance
- Drive continuous improvement initiatives for manufacturing equipment to increase efficiency, reduce downtime, and improve quality.
- Conduct root cause analysis and implement corrective actions to resolve manufacturing issues
- Proficient with 3D CAD software
- Ensure compliance with all safety requirements
- Create and maintain Process and Instrumentation Diagrams (P&IDs)
- Understand and apply Geometric Dimensioning and Tolerancing (GD&T) principles
- Work with external vendors and suppliers to ensure the timely delivery of equipment and materials
- Conceptualize and detail new manufacturing equipment for scaled up manufacturing processes
- Run experiments to determine the feasibility of new manufacturing processes and translate those learnings into practical designs