Senior Subassemblies Specialist — Precision Assembly Lead

Commonwealth Fusion Systems LLC; Harvard (MA); On-site; USD 110,000 - 140,000; Full time

Benefits offered by this job

Health, dental, and vision insurance

13 Company-wide Holidays

Flexible vacation days

10 sick days

Generous parental leave policy

401(k) with employer matching

Professional growth opportunities

Team-building activities

Job summary

Commonwealth Fusion Systems is seeking a Subassemblies Specialist to deliver precision, ultra high vacuum subassemblies for the SPARC Tokamak and to help install them into the machine. You will work with scientists and engineers to refine instructions and ensure quality.

This role emphasizes hands-on assembly, maintenance of cleanroom standards, and collaboration across teams to accelerate fusion energy development.

Qualifications

• High school diploma or equivalent.
• 5-7 years in a highly technical assembly role; e.g., aerospace/aircraft, racing, semiconductor, oil & gas, laboratory, wind, automotive.
• 2 years leading a team of four people or more.
• Can operate a forklift.
• Experience creating designs for tooling.
• Experience completing large scale projects end to end.
• Ability to use basic machining tools; e.g., lathe/mill.
• Experience using measurement tools.
• Experience using JIRA, Manufacturo, or other software based tracking.
• Experience rigging and lifting heavy components.
• Highly self-motivated, organized, and passionate about their work.

Responsibilities

• Build complex and simple subassemblies and components while maintaining cleanliness specs.
• Oversee contract technicians and ensure quality parts.
• Perform testing and check-outs with helium leak testing.
• Refine work instructions with scientists and engineers.
• Assist with precision alignment and installation of optical systems.
• Maintain cleanliness of work area and clean room.
• Support other CFS teams with skilled work.
• Develop strategies to overcome non-conformances in the field.

Skills

Forklift operation

Tooling design

End-to-end large projects

Machining basics (lathe/mill)

Measurement tools

JIRA / tracking tools

Rigging/heavy component lifting

Self-motivated / organized

Education

High school diploma or equivalent

Tools

Forklift

Lathe/Mill

JIRA / Manufacturo

Job description

Commonwealth Fusion Systems is seeking a Subassemblies Specialist to deliver precision, ultra high vacuum subassemblies for the SPARC Tokamak and to help install them into the machine. You will work with scientists and engineers to refine instructions and ensure quality.

This role emphasizes hands-on assembly, maintenance of cleanroom standards, and collaboration across teams to accelerate fusion energy development.