Molten Salt Engineer
- Location
- Devens, MA · On-site
- Job type
- Full-time
- Level
- Mid-level
- Education
- Bachelor's degree
- Listed
- 14 days ago
Skills & highlights for this role
- Corrosion testing of materials in molten salts
- Device testing in molten salts
- Test cell design and build
- SOP writing and modification for hazardous chemicals
- Safety systems for hazardous chemicals
- R&D laboratory experience
- Multidisciplinary teamwork
- Clear communication
- Problem solving
Also useful
- High temperature chemistry
- Molten salts
- Electrochemistry
- Ceramics
- Python
- MATLAB
- Laboratory equipment building and commissioning
- CAD software
What you'll do
- Perform corrosion testing of novel materials in molten salts
- Perform device testing in molten salts to obtain statistics on device performance
- Design and build new test cells for molten salt R&D
- Assist with lab maintenance and upkeep
- Write and modify SOPs for safe handling of hazardous chemicals, including fluoride salts (FLiBe)
What we're looking for
- Bachelors degree in Chemistry, Chemical Engineering, Materials Engineering, Nuclear Engineering, Mechanical Engineering, or similar field
- 0-2 years of work experience
- Experience with R&D work in a chemical or engineering laboratory
- Experience working with safety systems for hazardous chemicals
- 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
- High temperature chemistry
- Molten salts
- Electrochemistry
- Ceramics
- Python, MATLAB, or equivalent for data analysis
- Building and commissioning new laboratory equipment
- CAD software
Must-have requirements
- Ability to occasionally lift up to 50 lbs
- Perform activities such as sitting, typing, standing, stooping, or climbing for extended periods of time
- Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics
- Willingness to travel or work required nights/weekends/on-call occasionally
- #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.
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.
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 Molten Salt Engineer
Salt chemistry is a critical driver of corrosion, hydrogen speciation, and material behavior under irradiation. As the Blanket System team scales up to larger systems, maintaining precise control over salt chemistry is vital. We are seeking an entry-level Molten Salt Engineer to support our experimental testing operations.
Initially, you will focus on executing standard operating procedures (SOPs), conducting routine materials testing, and maintaining rigorous quality controls. As you build familiarity with our systems, your role will expand to include experimental design, test cell design and construction, and leading projects in materials corrosion and blanket health monitoring.
Ideal candidates will have a background in chemistry, chemical engineering, or a related discipline.
The Blanket System team has a strong culture of teamwork, supportive safety culture, and pragmatic risk management. We are looking for an engineer who will fit and actively contribute to this culture.
Equal opportunity and legal notices
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.
From Commonwealth Fusion Systems's careers page, first listed on Rolev.ai on October 26, 2026. Rolev.ai is not the employer.
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Common questions
Where is the Molten Salt Engineer job at Commonwealth Fusion Systems located?
This Molten Salt Engineer position at Commonwealth Fusion Systems is located in Devens, MA (On-site). Always check Commonwealth Fusion Systems's application page for specific state eligibility or relocation policies.
What qualifications are required for Molten Salt Engineer at Commonwealth Fusion Systems?
For the Molten Salt Engineer role, Commonwealth Fusion Systems highlights a bachelor's degree; experience with Corrosion testing of materials in molten salts, Device testing in molten salts, Test cell design and build, SOP writing and modification for hazardous chemicals, Safety systems for hazardous chemicals, R&D laboratory experience. Rolev.ai can score your existing resume against these requirements and show any skill gaps before you apply.
How do I apply for the Molten Salt Engineer position at Commonwealth Fusion Systems?
This listing links directly to Commonwealth Fusion Systems's Lever application page. You can apply directly on Commonwealth Fusion Systems's site, or use Rolev.ai to check your resume fit, generate a zero-hallucination tailored resume and cover letter for this posting, and autofill the Lever application form in 1 click with the Rolev.ai Chrome extension. You always review the form and press Submit yourself.