Commonwealth Fusion Systems is developing commercially viable fusion power plants, having raised over $2 billion in capital since 2018.

Commonwealth Fusion Systems is at the forefront of fusion energy development, working to deliver a sustainable energy future. As a Senior Mechanical Engineer for the SPARC superconducting magnets feeder team (FEED), you'll play a crucial role in developing and implementing cutting-edge technology. The position involves owning hardware from concept to delivery, performing complex analyses, and working with various teams to ensure successful implementation.

The role combines hands-on engineering with strategic thinking, requiring expertise in thermal, structural, and electromagnetic analysis. You'll be responsible for developing design notes, technical specifications, and assembly procedures while supporting procurement efforts. This position offers the opportunity to work on groundbreaking technology that could revolutionize energy production.

The ideal candidate brings substantial engineering experience, particularly in designing and supporting production hardware. You'll need strong analytical skills, practical experience with high-power mechanical systems, and the ability to work independently while collaborating with cross-functional teams. The position offers the chance to work with cutting-edge technology in fusion energy, contributing to a mission-driven company that values diversity and innovation.

Working at Commonwealth Fusion Systems means joining a team that has raised over $2 billion in capital and is leading the charge in fusion energy development. The company offers a fast-paced, values-driven environment where integrity, execution, impact, and self-critique are paramount. This role provides an opportunity to be part of a transformative technology that could reshape the future of energy production.

Senior Mechanical Engineer position at Commonwealth Fusion Systems, focusing on HTS Magnet Feeder System development for fusion energy technology.

Senior Mechanical Engineer - HTS Magnet Feeder System

Commonwealth Fusion Systems (CFS) is at the forefront of fusion energy development, working to revolutionize the energy industry through commercially viable fusion power plants. Since 2018, they've secured over $2 billion in funding, making them the most well-funded fusion energy company in the U.S.

The company is seeking an R&D HTS Test Engineer to join their team in Devens, MA, working on the SPARC net energy tokamak and future ARC tokamaks. This role is crucial in the development of compact high field magnet technology, which is essential for fusion energy systems. The position involves working with high temperature superconducting materials under extreme conditions, including high magnetic fields, neutron fluxes, and mechanical loads.

The ideal candidate will be responsible for managing a superconducting magnet system and conducting critical HTS characterization studies. This role offers the opportunity to work at the cutting edge of fusion energy technology, collaborating with multiple stakeholders across manufacturing, engineering, design, and R&D teams.

The position requires a strong background in physics or engineering, with specific experience in superconductor testing and cryogenic systems. The successful candidate will combine technical expertise with excellent communication skills and the ability to work in a fast-paced environment. This is an exciting opportunity to contribute to the urgent transition to fusion energy and be part of a team that's building the energy industry of the future.

CFS values diversity and maintains an inclusive work environment, considering all qualified applicants equally regardless of background. The company culture emphasizes integrity, execution, impact, and self-critique, making it an ideal place for mission-driven individuals who want to make a significant impact on the future of energy technology.

R&D HTS Test Engineer position at Commonwealth Fusion Systems, focusing on superconducting magnet systems and fusion energy development.

R&D HTS Test Engineer

Commonwealth Fusion Systems (CFS) is at the forefront of fusion energy development, working to revolutionize the energy industry through commercially viable fusion power plants. Since 2018, they've secured over $2 billion in funding, making them the most well-funded fusion energy company in the U.S. They're seeking a Metrology Engineer to join their mission-driven team in developing and qualifying mechanical inspection techniques for the SPARC project.

The role combines technical expertise with cross-functional collaboration, requiring someone who can develop and implement advanced inspection methods while working closely with supply chain, manufacturing, design, and R&D teams. The position offers the opportunity to work with cutting-edge technology in fusion energy, utilizing various metrology equipment and techniques.

The ideal candidate will bring strong technical capabilities in mechanical inspection, CAD design, and quality systems, along with excellent communication skills to present technical information to diverse audiences. The role offers the chance to be part of a growing company that values integrity, execution, impact, and self-critique, while working on technology that could transform global energy production.

CFS provides a dynamic, fast-paced environment where you'll work with advanced technology and contribute to solving some of the most challenging problems in energy production. The company strongly values diversity and maintains an inclusive workplace culture, making it an excellent opportunity for those passionate about both technical excellence and positive environmental impact.

Metrology Engineer position at Commonwealth Fusion Systems, developing and qualifying mechanical inspection techniques for fusion energy technology.

Metrology Engineer

Commonwealth Fusion Systems (CFS) is at the forefront of the urgent transition to fusion energy, combining decades of research with cutting-edge technologies to develop commercially viable fusion power plants. Since 2018, CFS has secured over $2 billion in capital, making it the most well-funded fusion energy company in the U.S.

As a Manufacturing Engineer - NPI at CFS, you'll be instrumental in bridging the gap between product development and full-scale production. Working on a weekend shift (6:00 am - 6:00 pm), you'll collaborate with cross-functional teams to ensure smooth product transitions from R&D to manufacturing. The role demands expertise in manufacturing processes, Lean methodologies, and hands-on problem-solving.

Your responsibilities will span from developing manufacturing processes and conducting DFM/DFA analysis to creating comprehensive documentation and training production personnel. You'll work with state-of-the-art technology in fusion energy, including magnets, thermo-mechanical assemblies, and vacuum systems.

The ideal candidate brings 5+ years of manufacturing engineering experience, strong analytical skills, and the ability to thrive in a fast-paced environment. You'll be joining a company that values integrity, execution, impact, and self-critique, working alongside mission-driven professionals who are passionate about revolutionizing the energy industry.

CFS offers a unique opportunity to be part of the clean energy revolution, working with cutting-edge technology while contributing to a sustainable future. The company maintains a strong commitment to diversity and inclusion, welcoming perspectives from all backgrounds to tackle complex challenges in fusion energy development.

Manufacturing Engineer role at Commonwealth Fusion Systems, focusing on transitioning new products from development to production in fusion energy technology.

Manufacturing Engineer - NPI - Weekend Shift

Commonwealth Fusion Systems is at the forefront of fusion energy development, working to revolutionize the energy industry through commercially viable fusion power plants. Since 2018, they've secured over $2 billion in funding, making them the most well-funded fusion energy company in the U.S. They're seeking a R&D Test Engineer to join their mission-critical team, focusing on testing and risk mitigation for HTS magnets.

The role demands a unique blend of mechanical, electrical, materials, fluids, and software engineering expertise. You'll be responsible for designing, building, and commissioning test equipment while working collaboratively across multiple teams. The position emphasizes mechanical design and construction of test equipment, requiring hands-on experience with cryogenic, vacuum, and high-current conditions.

As a Test Engineer, you'll develop comprehensive test plans, operate sophisticated equipment, and maintain crucial documentation. The role involves significant responsibility in safety management, anomaly investigation, and system scalability planning. You'll work with cutting-edge technology in fusion energy, contributing to groundbreaking developments in sustainable power generation.

The ideal candidate brings 5+ years of relevant experience, strong problem-solving abilities, and excellent communication skills. This role offers the opportunity to work with world-class scientists and engineers, making a direct impact on the future of clean energy. The position requires occasional travel and flexibility with working hours, reflecting the dynamic nature of breakthrough technology development.

Senior R&D Test Engineer position at Commonwealth Fusion Systems, focusing on HTS magnet testing and development for fusion energy technology.

R&D Test Engineer - Operations

Commonwealth Fusion Systems develops commercially viable fusion power plants, combining research, talent, and new technologies for the future of energy.

Commonwealth Fusion Systems (CFS) is at the forefront of fusion energy development, having raised over $2 billion in capital since 2018. The company is seeking a Full-Stack Software Engineer to join their Scientific Software team, focusing on developing software for understanding and building superconducting magnets and tokamaks.

The role centers on maintaining and expanding an internal web application that manages the processing of superconducting material (HTS) from electrical testing through magnet assembly. This application hosts the world's largest HTS test dataset and is built using modern TypeScript practices with React and Next.js. The position offers an unique opportunity to work at the intersection of web development and applied physics.

As a Full-Stack Software Engineer, you'll be responsible for both frontend and backend development, with emphasis on data visualization and user interface design. The role requires strong technical expertise in TypeScript, React, and SQL databases, combined with the ability to communicate effectively across technical disciplines. You'll work closely with internal teams, supporting the company's mission to deliver commercially viable fusion energy.

The position offers a competitive salary range of $150,000 - $250,000, plus equity and benefits. CFS values diversity and maintains an inclusive work environment, considering all qualified applicants equally regardless of background. The role offers the flexibility of remote work while contributing to groundbreaking energy technology development.

The ideal candidate will bring not only technical expertise but also a passion for problem-solving and the ability to thrive in a fast-paced startup environment. Optional experience with AWS, Rust, and Web Assembly would be advantageous, as would a background in Physics or Mathematics.

Full-Stack Software Engineer position at Commonwealth Fusion Systems, developing and maintaining critical web applications for fusion energy research and manufacturing.

Full-Stack Software Engineer

Commonwealth Fusion Systems develops commercially viable fusion power plants, combining research, talent, and new technologies to enable the transition to fusion energy.

Commonwealth Fusion Systems (CFS) is at the forefront of developing commercially viable fusion power plants, having raised over $2 billion in capital since 2018. They're seeking a Senior Scientific Software Engineer to join their Scientific Software team, focusing on developing software for superconducting magnets and tokamaks.

The role primarily involves developing a fiber optic quench detection system - a critical safety component that detects thermal runaway events in superconducting magnets. You'll work with Python-based fiber models to simulate quench signals and develop detection algorithms. The position combines sophisticated physics-based modeling with practical software engineering challenges.

As a Senior Scientific Software Engineer, you'll be responsible for analyzing experimental data, validating models, and developing real-time detection algorithms. The role requires a unique blend of software engineering expertise and physics understanding, particularly in electromagnetics and optics.

The ideal candidate should be proficient in Python, with experience in scientific computing libraries like pandas, numpy, and matplotlib. You'll need to understand numerical methods, linear algebra, and differential equations, while being capable of setting up comprehensive software development environments including CI/CD pipelines.

CFS offers a fast-paced, mission-driven environment focused on making fusion energy a reality. They value diversity and maintain an inclusive workplace culture, considering all qualified applicants equally regardless of background. This role provides an opportunity to work at the intersection of cutting-edge physics and software engineering, contributing to the future of clean energy.

Senior Scientific Software Engineer role at Commonwealth Fusion Systems, developing quench detection systems for fusion power plants using Python and physics-based modeling.

Senior Scientific Software Engineer – Magnet Protection Systems

Commonwealth Fusion Systems (CFS) is at the forefront of the urgent transition to fusion energy, combining decades of research with cutting-edge technologies to develop commercially viable fusion power plants. Since 2018, CFS has secured over $2 billion in funding, making it the most well-funded fusion energy company in the U.S. 

The Senior Electrical Engineer - Battery Storage Systems role is a crucial position within the SPARC team, reporting to the Director of Power Systems. This role demands a skilled professional to lead complex electrical design projects for battery storage systems essential to fusion power generation. The position involves comprehensive responsibility for all stages of battery storage system development, from prototyping to final commissioning.

The ideal candidate will bring 8+ years of experience in battery or photovoltaic storage systems, demonstrating expertise in system design, integration, and field implementation. They will lead technical teams, collaborate with vendors, and ensure high-quality deliverables that meet specifications and timelines. The role offers an opportunity to work on groundbreaking technology while contributing to the future of clean energy.

Working at CFS means joining a mission-driven organization that values integrity, execution, impact, and self-critique. The company embraces diversity and maintains an inclusive work environment, considering all qualified applicants equally regardless of background. This position offers the chance to be part of a revolutionary advancement in energy technology while working with top talent in the field.

Senior Electrical Engineer position focusing on battery storage systems for fusion power technology at Commonwealth Fusion Systems.

Senior Electrical Engineer - Battery Storage 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.

Commonwealth Fusion Systems (CFS) is seeking a Senior Mechanical Engineer for their Assembly Team to work on the SPARC tokamak device. This role involves designing, developing, and managing the fabrication of unique tooling for the assembly and integration of the tokamak. You'll be responsible for developing overall concepts, engineering strategies, and use plans for each tool assembly, working closely with system teams to find efficient, creative, and safe ways to manipulate and integrate tokamak components.

Key responsibilities include:
- Ownership and design of tooling, lifting, manipulation, and support frames for SPARC system components
- Formulating assembly strategies and coordinating with system teams
- Analyzing tool structures and kinematics for safety and adequacy
- Developing alignment plans for precision placement of magnets and vessels
- Overseeing tool fabrication at outside vendors
- Creating assembly work instruction packets
- Collaborating with other engineers, designers, and assembly personnel

The ideal candidate will have:
- B.S. in Civil, Structural, Mechanical, or Aerospace Engineering
- 3-5 years of Mechanical Engineering experience
- Experience in fabrication and integration of complex, large mechanical structures
- Familiarity with standard actuation and guidance mechanisms
- Experience with finite element analysis and lifting operations (>10 Tons)

CFS offers a fast-paced, dynamic environment driven by values of integrity, execution, impact, and self-critique. They value diversity and are an equal opportunity employer, considering all qualified applicants regardless of background.

Join CFS in their mission to revolutionize the energy industry through fusion power!

Senior Mechanical Engineer for Assembly at Commonwealth Fusion Systems, designing and managing tooling for SPARC tokamak device assembly.

Senior Mechanical Engineer - Assembly

As the Senior Field Mechanical Engineer on the Assembly Team at CFS, you will be responsible for the management, engineering oversight, and problem-solving of the most complex and unique work-stations of the SPARC assembly process. You will be the central owner and know your part of the assembly process through-and-through, and you help guide the technicians through any issues that arise along the way, coming up with solutions that continue work and assembly moving forward. You will proactively ensure that they have all the tools required for the work, either procuring them off-the-shelf or quickly designing and building small tools and fixtures for use. This also includes the close collaboration with adjacent teams on the Assembly Team, such as creating and incorporating the new process changes with the Assembly Process team, or providing the Metrology team with any assistance or tools needed for the precision alignment of coils and other key structures. This role is on-site at Devens, MA but is a "field" role in the sense that you will be working day-to-day in the central construction hall in the CFS-2 facility where we are building the SPARC Tokamak. At the core, your role is to keep the assembly process moving smoothly in any and all ways, managing the day-to-day changes in strategy or work orders, problem-solving and making tools, and using your engineering skills and knowledge to solve the many complex challenges that arise during the assembly process. You will guide and manage how the giant parts of this multi-million pound "Swiss-watch" come together!

Key Responsibilities:
- Own and be an expert in the assembly sequence of your work-station
- Ensure full readiness of a work-station to enable the start of assembly
- Determine and execute solutions for identified assembly issues
- Procure or build all necessary tools, fixtures, or manipulation equipment
- Serve as the extreme owner for a process by testing, implementing, and handing off to production technicians
- Provide design feedback to SPARC sub-system designs
- Assist in the disposition and resolution of non-conformance issues
- Support hands-on operations during Tokamak Assembly
- Work collaboratively with teammates to ensure all requirements are met

Join Commonwealth Fusion Systems in their mission to deliver the urgent transition to fusion energy. Since 2018, they've raised over $2 billion in capital – more than any other fusion energy company in the U.S. They're looking for thinkers, doers, builders, and makers to join their team and bring new perspectives, solve tough problems, and thrive as part of a team.

Senior Field Mechanical Engineer for Assembly at Commonwealth Fusion Systems, leading complex SPARC Tokamak assembly process in Devens, MA.

Senior Field Mechanical Engineer - Assembly

Commonwealth Fusion Systems (CFS) is at the forefront of fusion energy development, aiming to revolutionize the energy industry. As a Senior Mechanical Engineer, you'll play a crucial role in designing and implementing advanced R&D equipment and complex machinery. You'll work with a multidisciplinary team of top scientists and engineers, owning key mechanical modules and sub-systems. The role demands innovative problem-solving, strong analytical skills, and the ability to drive projects to completion with speed. CFS offers a dynamic, fast-paced environment where your expertise in mechanical design, 3D modeling, and simulation will be vital. With over $2 billion raised since 2018, CFS is well-positioned to make fusion energy a reality. This role offers not just a job, but an opportunity to be part of a mission that could change the world's energy landscape. Join CFS to apply your skills in a challenging, rewarding environment that values diversity and pushes the boundaries of what's possible in energy technology.

Senior Mechanical Engineer role at Commonwealth Fusion Systems, designing advanced R&D equipment for fusion energy development.

Senior Mechanical Engineer

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy. We're designing and building commercially viable fusion power plants.

Commonwealth Fusion Systems is at the forefront of the urgent transition to fusion energy. We're designing and building commercially viable fusion power plants, working with policymakers and suppliers to shape the future of energy. Since 2018, we've raised over $2 billion in capital, more than any other fusion energy company in the U.S.

As a Senior Supplier Development Engineer, you'll be a crucial link between suppliers and internal teams. Your goal is to foster strong relationships with suppliers while ensuring they meet quality and production requirements. You'll spend significant time on-site with vendors, reviewing engineering requirements, identifying process gaps, and driving improvements.

Key responsibilities include:
- Acting as a technical liaison between suppliers and internal teams
- Reviewing and advising on engineering requirements for complex components
- Identifying and closing process gaps at vendor sites
- Resolving supplier-related challenges to meet key milestones
- Implementing process controls and quality plans
- Supporting ISO 9001:2015 implementation
- Developing in-process inspection and test procedures
- Conducting process capability studies and measurement systems analysis
- Driving cost reduction projects
- Managing supplier contracts and performance
- Leading and mentoring team members

Requirements:
- Bachelor's Degree in Engineering (Master's preferred)
- 6+ years of experience in Engineering or Supply Chain
- Experience with supplier assessments, audits, and quality management systems
- Knowledge of machining processes and magnet manufacturing
- Strong analytical and problem-solving skills
- Excellent communication and negotiation skills
- Ability to work under pressure and adapt to changing priorities
- Familiarity with CAD and GD&T
- Willingness to travel and work flexible hours

Join us in powering the future of energy with fusion technology!

Senior Supplier Development Engineer role at Commonwealth Fusion Systems, focusing on supplier relationships and quality management in fusion energy.

Commonwealth Fusion Systems Engineering Jobs

Commonwealth Fusion Systems is developing commercially viable fusion power plants, having raised over $2 billion in capital since 2018.