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Senior Mechanical Engineer, Process Equipment
Job Location:
Job Location:
Devens, MA - USA
Yearly Salary:
USD 110000 - 185000
Yearly Salary:
Posted:
1 October 2026 (2 days ago)
Posted:
Application Deadline:
29 December 2026
Application Deadline:
Vacancies:
1 Vacancy
Vacancies:
Job Summary
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 were designing and building commercially viable fusion power plants. And were working with policymakers suppliers and many others to build the energy industry of the future.
Were in the best position to make it happen. Since 2018 weve raised $4 billion of capital making us the largest and leading fusion company in the world.
Now were looking for more thinkers doers builders and makers to join us. People wholl bring new perspectives solve tough problems and thrive as part of a team.
If thats you and this role fits we want to hear from you.
Join the power movement as a Senior Mechanical Engineer Process Equipment
The Fuel Cycle and Blanket Development Team is growing to deliver R&D and pilot-scale molten salt (FLiBe) systems to advance fusion. The technology readiness of FLiBe wetted components is modest due to the challenges of the high operating temperature different corrosion modes and the chemistry control required to achieve long term goals. The Fuel Cycle and Blanket Development team is looking for a Senior Mechanical Engineer to drive the design and delivery of molten saltprocess equipment including ASME tanks heat exchangers piping systems and gas processingequipment. This engineer will need to work collaboratively with internal teams at CFS as well as withkey external partners to reach ARCs ambitious technical targets.
CFS engineering teams have a strong practice of carrying engineering risk where appropriate while attentively and aggressively managing safety risk and we are looking for an engineer who will actively contribute to this culture.
CFS engineering teams have a strong practice of carrying engineering risk where appropriate while attentively and aggressively managing safety risk and we are looking for an engineer who will actively contribute to this culture.
What youll do:
- Lead and contribute to the design of fluid process systems for testing at varying scales
- Develop specifications and designs of high-temperature molten salt process equipment including vessels tanks valves pumps and piping systems
- Be the technical lead interfacing with suppliers and construction teams to procure install and commission process equipment
- At later project stages support fixed equipment mechanical reliability
- Support pipe stress evaluations working with piping stress engineers
- Collaborate across CFS teams to incorporate R&D learnings and interfacing system requirements into component designs and specifications
- Actively engage with suppliers contactors and CFS teams to put safety first at all project stages
- Track projects and tasks against milestones and report progress up and across the organization
What were looking for:
- Bachelors degree in Chemical Engineering Mechanical Engineering or equivalent
- 8 years of work experience
- Detailed knowledge of ASME BPVC and B31.3 and their use in designing process equipment and piping systems
- Design of industrial scale fixed equipment
- Design of higher temperature equipment and components
- Management of external partners and suppliers
- Design for hazardous fluid service
- Experience at a refinery chemical plant or heavy industrial facility preferred
- Familiarity with design/construction codes and standards such as ASME Section I ASME Section VIII ASME B31.3 API 510 API 570AND API 579 preferred
- Familiarity with P&IDs CAD process flow diagrams analysis such as heat and mass balances
- Strong commitment to designing for and working in a safety-prioritized environment.
- Ability to learn new skills/subject matter quickly
- Ability to work effectively in a multidisciplinary team of engineers scientists technical staff and others
- Ability to clearly express and critique ideas
- Great communication and organizational skills
- Strong problem solving skills ability to approach new problems with creativity
Bonus points for:
- Experience with corrosive fluid systems
- Experience with rotating equipment design procurement installation commissioning and reliability.
- Experience with molten salt systems
- Experience with electro-chemical systems
- Analysis of pipe stress and support systems
- Analysis of vessel nozzle loads and stresses
- CAD software
Must-have requirements:
- Ability to occasionally lift up to 50 lbs
- Perform activities such as typing standing or sitting for extended periods of time
- Willing to occasionally travel to suppliers and support commissioning/test activities
- Dedication to safety to mitigate industrial hazards that may include heat cold noise fumes strong magnets lead (Pb) high voltage high current pressure systems and cryogenics
$110000 - $185000 a year
Salary 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-Onsite
At CFS we excel in fast-paced environments driven by our values of integrity execution impact and self-critique. As we grow were 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.
Required Experience:
Senior IC
