Lead Technician, Assembly Testing

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. And we're working with policymakers, suppliers, and many others to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading 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 a Lead Technician, Assembly Testing

The Mechanical Commissioning Field Lead is responsible for leading a small team (2-3 technicians) in the execution of SASY testing activities under the direction the Manger of Assembly Testing with guidance and support from Test Engineering. These activities may also include assembly activities, as testing will take place in parallel with SPARC assembly. The lead technician will have daily hands-on responsibilities

Execute complex testing procedures in the field with a primary focus on mechanical testing to include pneumatic pressure proofing and leak detection using helium leak detector.

Work under the direction of Manager, Assembly Testing, to execute test procedures

Serve as front line supervisor for test technicians by providing guidance and instruction to technicians to facilitate safe, effective, and efficient execution of work

Identify issues and potential issues pro-actively, ensure accurate submission to our work and quality management systems and assist to drive issues to successful conclusions

Ensure completion of all test documentation in an accurate and timely fashion

Coach technicians to embody the CFS behaviors and guiding principles in all interactions

Represent the SASY Test team in collaboration with all CFS cross-functional teams as required

Adhere to the highest standards of safety and ensure that activities taking place are being performed in accordance with CFS safety policies and applicable regulatory safety standards

HS Diploma

Minimum 5 years of hands-on mechanical testing experience, with a heavy focus on pneumatic pressure proofing and helium leak detection using mass spectrometers.

Proven experience leading small to medium-sized crews of technicians performing complex mechanical or testing activities.

Demonstrated experience with high-vacuum hardware: Must be proficient in plumbing temporary test fixtures and making connections using KF, CF, VCR, compression fittings, and NPT.

Familiarity with setting up and connecting vacuum systems, including turbomolecular pumps and leak detectors.

Mid-level proficiency in with Microsoft or Google productivity software

Formal training (40+ hours) or active progression toward an ASNT Level II NDT certification in Leak Testing.

Direct experience with specific leak testing methodologies (e.g., tracer probe, hood technique, and helium-filled object techniques).

Prior experience working in fusion-relevant, aerospace, or semiconductor cleanroom environments.

Experience with low or high voltage electrical testing

Ability to occasionally lift up to 50 lbs

Perform activities such as stooping, climbing, typing, standing, or sitting for extended periods of time

Work in a facility that contains industrial hazards including heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, and cryogenics

Willingness to travel or work required nights/weekends/on-call occasionally

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