Senior Mechanical Engineer, Molten Salt Process Equipment

Commonwealth Fusion Systems LLC; Harvard (MA); On-site; USD 134,000 - 205,000; Full time

Benefits offered by this job

Equity

Health insurance

Parental leave

401(k) matching

Professional growth

Job summary

Commonwealth Fusion Systems LLC is seeking a Senior Mechanical Engineer, Process Equipment to lead the design of high-temperature molten salt process equipment, including vessels, tanks, valves, pumps and piping systems. You will interface with suppliers and construction teams to procure, install and commission equipment, and support later reliability efforts.

The role emphasizes safety, collaboration across multidisciplinary teams, and active engagement with external partners to meet ARC’s

Qualifications

• 8+ years of work experience in mechanical design for high-temperature process equipment.
• Experience with ASME BPVC, ASME Section I & VIII, and API standards is preferred.
• Knowledge of molten salt systems and corrosive fluid handling.
• Experience with external partners, procurement, and commissioning.

Responsibilities

• Lead and contribute to the design of fluid process systems for testing at varying scales.
• Develop specifications and designs of high-temperature molten salt process equipment, including vessels, tanks, valves, pumps and piping systems.
• Be the technical lead interfacing with suppliers and construction teams to procure, install and commission process equipment.
• At later project stages, support fixed equipment mechanical reliability.
• Support pipe stress evaluations working with piping stress engineers.
• Collaborate across teams to incorporate R&D learnings into designs and specs.
• Engage with suppliers and contractors to prioritize safety at all project stages.
• Track projects and report progress against milestones.

Skills

ASME BPVC

ASME B31.3

Fixed equipment design

High-temperature equipment

P&IDs

CAD software

Rotating equipment design

Molten salt systems

Safety-focused culture

Supplier management

Education

Bachelor's degree in Chemical or Mechanical Engineering

Tools

CAD software

Job description

Commonwealth Fusion Systems LLC is seeking a Senior Mechanical Engineer, Process Equipment to lead the design of high-temperature molten salt process equipment, including vessels, tanks, valves, pumps and piping systems. You will interface with suppliers and construction teams to procure, install and commission equipment, and support later reliability efforts.

The role emphasizes safety, collaboration across multidisciplinary teams, and active engagement with external partners to meet ARC’s