R&D Test Engineer - Fluid Systems

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. We’re working with policymakers and suppliers to build the energy industry of the future. Since 2018, we’ve raised nearly $3 billion in capital, making us the largest and leading private 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 an R&D Test Engineer

The role of an R&D Test Engineer is to develop novel fluid systems for R&D test stands, with a major focus on supporting magnet testing. The range of process fluids is broad (liquid, gaseous, cryogenic, supercritical, molten salt, etc.), requiring strong mechanical and chemical engineering fundamentals. The ideal candidate will be resourceful—combining industry best practices, off-the-shelf and customized hardware, and creativity to deliver these fluid systems on tight timelines.

Projects will be on varying scales, from smaller‑scale test stands and deep system analysis to larger, complex projects as needed for SPARC and ARC. In addition to designing and building, the engineer will actively operate as a test engineer to commission systems and design automation alongside a team of test/software engineers and operators. You must work collaboratively across production, R&D, procurement, and the SPARC team.

Various projects will also require flexing outside of traditional fluids engineering into other disciplines, such as structures and materials engineering, to successfully retire risks for SPARC and ARC.

• Design fluid systems for test stands that meet test objectives/requirements, soliciting feedback from interfacing teams as necessary.
• Challenge requirements as necessary to achieve simplicity in design and develop efficient de‑risking strategies and plans.
• Perform hand calculations and system‑level analyses demonstrating sufficient margin for fluid system requirements; build and run Ansys structural and thermal simulations on components and assemblies.
• Procure off‑the‑shelf process fluid components, manage relationships with vendors, draft specifications for specialty parts and design custom fluid system components as needed.
• Manage the build and commissioning of fluid systems, coordinating engineers and technicians to safely bring systems to operational status.
• Design system instrumentation and automation for safe operations.

• Bachelor’s degree in mechanical, chemical, process engineering, or a closely related field.
• 5+ years of experience in the engineering of integrated fluid/mechanical systems (experience with both small‑scale rapid R&D and large‑scale systems is highly desired).
• Full‑lifecycle fluid systems:
  • Hands‑on experience executing the entire lifecycle of large‑scale thermofluid systems.
• Component expertise:
  • Experience developing specifications, sizing and working with tanks, process piping, pumps, valves, compressors, purification stages, circulators, heat exchangers, etc.
• Design documentation:
  • Strong background in establishing system requirements, generating process flow diagrams (PFDs), and developing piping and instrumentation diagrams (P&IDs).
• Instrumentation:
  • Experience in the design, integration, and troubleshooting of system instrumentation.
• Software and analysis tools:
  • Experience utilizing engineering tools such as ANSYS, COMSOL, 1D compressible flow codes, Python and MATLAB.
• Extreme environments:
  • Practical experience designing, building, and commissioning fluid systems for specialized pressurized, cryogenic, vacuum, and/or elevated‑temperature applications.
• Vendor relations:
  • Experience sourcing complex components, drafting technical specifications, and managing relationships with specialized vendors and suppliers.
• Cross‑functional communication:
  • Strong ability to distill complex fluid system details and effectively…