Commonwealth Fusion Systems
Senior Mechanical Engineer, Process Equipment
$134K–$205K
Devens, MA · Hybrid · Senior · Full-time · Posted Sep 22, 2026
- Experience
- 8+ years of work experience.
- Education
- Bachelor’s degree in Chemical Engineering, Mechanical Engineering, or equivalent.
- Visa sponsorship
- Employment offers are contingent on compliance with U.S. Export Control Laws.
About the job
Leads the design, specification, procurement, installation, and commissioning of molten-salt process equipment and fluid systems for fusion R&D and pilot-scale projects.
What you'll do
- Design fluid process systems and high-temperature molten-salt equipment, including vessels, tanks, valves, pumps, and piping.
- Lead supplier and construction-team interfaces for equipment procurement, installation, and commissioning; support reliability and pipe-stress evaluations.
- Coordinate across teams, incorporate R&D findings into designs, prioritize safety, and track project milestones.
What they ask for
- Bachelor’s degree in Chemical Engineering, Mechanical Engineering, or equivalent.
- 8+ years of work experience.
- Detailed knowledge of ASME BPVC and B31.3 and their application to process equipment and piping systems.
- Experience designing industrial-scale fixed equipment, higher-temperature equipment, and equipment for hazardous fluid service; experience managing external partners and suppliers.
Nice to have
- Experience at a refinery, chemical plant, or heavy industrial facility; familiarity with listed design and construction codes and standards.
- Experience with corrosive fluids, rotating equipment, molten salt or electro-chemical systems, pipe stress, vessel analysis, or CAD software.
Pay
USD 134,000–205,000 per-year-salary; base salary
Tools
ASME BPVC, B31.3, ASME Section I, ASME Section VIII, API 510, API 570, API 579, CAD
Model-written summary · the original posting is authoritative