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Staff Modeling and Simulation Engineer
Job Location:
Job Location:
Milpitas, CA - USA
Yearly Salary:
$ 130000 - 200000
Yearly Salary:
Posted:
9 August 2026 (30+ days ago)
Posted:
Application Deadline:
18 November 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 Staff Modeling and Simulation Engineer
Were looking for a Staff Modeling and Simulation Engineer to join our design team to help build next-generation this role you will serve as a lead technical expert for advanced simulations driving the predictive validation of complex hardware systems.
This role requires a high-level practitioner in multi-physics simulation who can comfortably model complex interactions across thermal structural fluid flow and chemical regimes. If you enjoy solving deeply complex physics problems applying rigorous modeling standards and working in a collaborative fast-paced environment to deliver first-of-a-kind hardware this is your opportunity to make an impact.
What youll do:
- Execute Simulation and Modeling: Lead advanced Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) for advanced processing equipment
- Run Multi-Physics Analysis: Build run and evaluate highly coupled simulations covering structural mechanics high-temperature thermal management fluid/gas flow dynamics and chemical reaction kinetics
- Apply Engineering Best Practices: Implement engineering workflows for simulation data management mesh convergence criteria and rigorous verification and validation (V&V) protocols using physical test data
- Drive Design Reviews: Provide analytical leadership during technical design reviews verifying structural margins thermal stress distributions and flow uniformity to guide design choices
- Collaborate & Interface: Partner closely with cross-functional teams including Mechanical Designers Electrical Engineers Materials Scientists and Chemical Specialists to translate simulation insights into actionable hardware modifications
- Project Accountability: Own and report on modeling milestones timelines and computational resources to stakeholders ensuring on-time and in-spec delivery
- Mentor Talent: Coach and mentor junior engineering staff on modeling methodologies simulation accuracy and the practical application of finite element principles to real-world hardware
- Get Things Done: Act with speed to solve critical engineering bottlenecks validating design optimization paths from concept through prototype deployment
What were looking for:
- Education: Masters or PhD degree in Mechanical Engineering Aerospace Engineering Physics or a related field with a heavy focus on computational mechanics and multi-physics modeling
- Experience: 10 years of experience in simulation and predictive analysis of complex R&D systems
- Software Mastery: Advanced hands-on expert in ANSYS COMSOL Multi-physics or equivalent high-end FEA/CFD simulation platforms
- Multi-Disciplinary Analytical Expertise: Proven track record of successfully running coupled simulations (e.g. fluid-structure interaction thermal-structural behavior and chemical reaction modeling)
- Empirical Correlation: Ability to bridge the gap between virtual models and the shop floor by validating simulation results against physical test metrics like strain gauge data thermal imaging and flow sensors
- Leadership: Demonstrated ability to influence hardware design direction through analytical data and lead cross-functional initiatives in a matrixed environment
Bonus points for:
- Standards Knowledge: Familiarity with applying industry codes to simulation-driven design validation
- Motion & Dynamics: Experience running transient dynamic simulations or modeling precision motion systems in extreme thermal environments
Must-have requirements:
- Ability to lift up to 25 lbs occasionally
- Perform activities such as stooping climbing standing sitting for extended periods of time
- Willingness to travel or work required nights/weekends/on-call occasionally
- 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
$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
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
