About Pacific Fusion

Pacific Fusion was founded in 2023 with the mission to power the world with abundant, affordable, clean energy.

We are rapidly designing and building a pulsed magnetic fusion system to achieve net facility gain (more fusion energy output than stored energy input). In parallel, we are developing the key components required to build affordable fusion systems.

Our plans are ambitious. We have raised over $900M so far from incredible investors, resourcing us to deliver on these plans. We are bringing together the best scientists, engineers, and operators from the fusion community, hard tech industry, and other sectors. We are united by a shared sense of urgency to provide clean power for the world, particularly managing climate change while meeting growing global energy demand. You can read more about us in this letter from our founders.

Why This Role Matters

As a critical member of our engineering team, the Senior Mechanical Engineer - Vacuum Systems will lead the design, analysis, and implementation of cutting-edge vacuum systems, enabling the next generation of fusion technology.

What You'll Do

• Design, analyze, and test advanced vacuum systems for target area chambers and diagnostics.
• Select and size vacuum components, including pumps, seals, ducts, and valves, ensuring performance in particle-free cryogenic environments.
• Rapid prototyping for fusion technology applications.
• Lead engineering activities from concept development through final onsite commissioning of vacuum equipment and systems.
• Conduct detailed thermodynamic, heat transfer, fluid mechanics, and structural mechanics analyses to support system development.
• Perform experiments to characterize materials for outgassing, permeability, and vacuum compatibility.
• Provide solutions to field issues related to vacuum system design and performance.
• Collaborate cross-functionally to educate and negotiate design requirements within a multidisciplinary team.

What You Bring

• B.Sc., M.Sc., or Ph.D. in Mechanical or Aerospace Engineering.
• Proven expertise in high vacuum systems design, analysis, and construction.
• Hands-on experience with vacuum components: chambers, pumps, seals, valves, ducts, and clean room techniques.
• Proficiency in vacuum modeling tools (e.g., COMSOL, MolFlow, or OpenFOAM) and FEA/CFD analysis.
• Familiarity with ASME BPVC and B31.3 codes.
• Experience with radioactive or toxic gas vacuum systems, novel vacuum pumps, or material characterization.

Benefits

• Industry-competitive salary

• Equity plan

• 6% employer 401k matching

• Generous paid time off (including sick leave, vacation, paid family leave)

• Medical, Dental, and Vision insurance

Actual base salary offered will be determined by: experience, skills, and work location. This range is for base salary, our total compensation includes equity and benefits. We welcome you to apply even if your expectations are outside our listed range.

Pacific Fusion is committed to creating a diverse environment and is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.

Pacific Fusion is committed to providing reasonable accommodations for qualified individuals with disabilities in our job application procedures and throughout employment. If you need assistance or any accommodation, please let us know.

Pacific Fusion does not accept unsolicited resumes from recruiters or employment agencies without a fully executed recruitment agreement in place. In the absence of such agreement, Pacific Fusion reserves the right to pursue and hire any candidates without an obligation to pay fees. Agencies are requested not to contact Pacific Fusion hiring managers or employees regarding recruiting services.