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Staff Computational Materials Scientist

Commonwealth Fusion Systems

Job Location:

Devens, MA - USA

Yearly Salary: USD 130000 - 200000

Posted: 25 September 2026 (Yesterday)

Application Deadline: 23 December 2026

Vacancies: 1 Vacancy

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 Staff Computational Materials Scientist

The Materials and Processing (M&P) Department at CFS supports design engineers supply chain and manufacturing by selecting materials unambiguously defining materials and processing routes validating and measuring those materials and their properties and conducting R&D to develop new materials and processes to enable fusion power deployment. M&P at CFS is organized around three primary thrusts: engineering test and characterization and development programs. The work is undertaken in support of delivering SPARC the net energy tokamak under construction in Devens MA and ultimately in designing the ARC fusion power plant. These devices pose unique materials challenges including neutron fluxes produced by deuterium-tritium fusion high heat loads molten salt coolant systems complex component topologies high magnetic fields and high mechanical loading in cryogenic conditions.

To support this mission the CFS Materials Department is seeking a Computational Materials Scientist with expertise in process-structure-properties relationships physics informed modeling and materials in extreme environments. The ideal candidate would have a background in both computational materials simulation methods and materials science and/or physical chemistry. The responsibilities will include physics-based modeling synthetic data generation and first-principles modeling and simulation to support development of CFS materials. They will collaborate with other engineers and subject matter experts to identify highest sensitivity parameters and prioritize experimental work for greatest impact to decreasing uncertainty

What youll do:

Use and build computational toolsets workflows and methods to generate predicted material properties in extreme environments including temperature radiation and magnetic field with uncertainty bounds informed by physical mechanisms
Identify chemical and microstructural features that strongly impact material performance in extreme environments and quantify the relationships for use in optimization for engineering application
Inform design of experiments for materials in extreme environments including simultaneous corrosion stress and irradiation. As well as magnetic field electric field and high temperature
In collaboration with design and analysis engineers develop material design curves methodology capable of determining statistically significant minimum properties for tokamak applications such as low and high cycle fatigue dielectric breakdown radiation effects
Identify gaps in knowledge and experimental capability which can be filled via simulation or model building
Assist in benchmarking and creating metrics for material property variability and sources of variability in manufacturingfabrication assembly and processes
Collaborate with other M&P Engineers to create workflows to enable the appropriate capture storage data visualization and analysis of data generated within the materials domain
Support writing materials standard specifications
Stay current with the evolving technology and modeling techniques

What were looking for:

Materials Science and Engineering Applied Physics Applied Mathematics Physical Chemistry Computer Science or related field
Minimum of 10 years experience in experimental or computational materials science
Experience using computational materials science tools and integrated computational materials engineering (ICME) tools to answer specific scientific or engineering questions across length scales
Implementation and/or authorship of codes for calculation and analyses of material properties and microstructures
Predictive models for material properties and microstructure evolution in extreme environments
Validation of models with experimental data or physical mechanism bounds
Understanding process-structure-properties-performance principles and fundamental mechanisms responsible for property changes in extreme environments
Understanding of the underlying models that enable materials simulation methods across length scales including; Atomistic molecular dynamics density functional theory Monte Carlo phase field crystal plasticity dislocation dynamics and computational thermodynamics finite element
Scientific computing numerical algorithms FEM FD FVM BEM eigen/linear/PDE solvers convex optimization computational geometry advanced statistical methods
High-performance computing: distributed processing message parsing interface gpu acceleration
Understanding of the sensitivity to uncertainty in the inputs and outputs of those calculations or models
Demonstrated ability to work effectively cross-functionally
Excellent organizational skills including prioritization of multiple concurrent projects
Ability to break down complex problems into smaller deliverables that add value

Bonus points for:

Experience displaying complex quantitative data in a simple intuitive format and presenting findings clearly and concisely
Experience making and justifying decisions in fast paced engineering settings
Written and verbal communication with technical teams
Taking under-defined problems and driving them to a state of completion
Operating in a flexible service-oriented engineering domain team

Must-have Requirements:

Perform activities such as typing and sitting 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. Travel less than 10%

$130000 - $200000 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

Does your experience not meet all of our posted requirements Studies have shown that some people are less likely to apply to positions unless they meet every listed requirement. We are committed to building a diverse inclusive flexible and collaborative environment so if you want to help us transition the world to clean and affordable electricity and dont meet all posted requirements for a particular role wed still love to hear from you. We can sometimes be flexible enough to shift responsibilities for the right person or otherwise identify open or upcoming roles that may better fit your professional background.

#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:

Staff IC

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