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Fiber Optic Specialist

Commonwealth Fusion Systems

Job Location:

Somerville, NJ - USA

Hourly Salary: $ 38 - 48

Posted: 5 June 2026 (30+ days ago)

Application Deadline: 18 November 2026

Vacancies: 1 Vacancy

The job posting is outdated and position may be filled

Job Summary

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 were designing and building commercially viable fusion power plants. And were working with policymakers suppliers and many others to build the energy industry of the future.

Were in the best position to make it happen. Since 2018 weve raised $4 billion of capital making us the largest and leading fusion company in the world.

Now were looking for more thinkers doers builders and makers to join us. People wholl bring new perspectives solve tough problems and thrive as part of a team.

If thats you and this role fits we want to hear from you.

What youll do:

Conduct the handling routing splicing testing and potential repair of 1000s of fibers throughout the SPARC fusion machine
Perform mechanical integration of small assemblies adjacent or in conjunction with the fiber work such as passthrough flanges and enclosures for the fibers
Install composite or polymer wrappings for the fibers and their enclosures
Train other technicians as needed in the proper installation splicing routing and measurement procedures
Improve safety protocols for laser and fiber optic handling
Fulfill manufacturing and R&D fiber needs

What were looking for:

4 years experience in fiber optics field applications
Experience with taking attenuation insertion loss and spectral analysis measurements using various measurement equipment (such as OTDR OSA OBR power meter etc.)
Must have experience fiber handling in a lab setting with known standards

Bonus points for:

7 years experience in fiber optics field applications
Experience in utilizing distributed sensing arrays
Experience with polyimide and a variety of coated fibers
At least 1 year experience in teaching and/or training fiber splicing techniques and cable assemblies
Experienced with designing building and testing fiber cable assemblies particularly in cryogen and vacuum conditions
Experience performing fiber optic work in environments with limited space or requiring odd positions.
Skills:
- Fiber coating removal
- Fiber re-coating
- Specialty fiber splicing
- Fiber proof-testing
Measurement and analysis techniques with optical tools and equipment such as interrogators optical multiplexers optical switches fault locators OTDR etc.
Knowledgeable about various optics sensing techniques and optical attenuation/insertion loss mechanisms
Basic Materials Science knowledge
Good communication skills
Good attention to detail

Must-have Requirements:

Ability to occasionally lift up to 50 lbs
Perform activities:
- Stooping typing standing or sitting for extended periods of time
- May need to operate in small confined places in odd locations
- Work locations could include being on platforms around 25 feet high
Dedication to safety to mitigate industrial hazards that may include heat cold noise fumes strong magnets lead (Pb) high voltage and cryogenics
Willingness to travel or work required nights/weekends/on-call occasionally

$38 - $48 an hour

#CFS-NE

At CFS we excel in fast-paced environments driven by our values of integrity execution impact and self-critique. As we grow were eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.

We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally regardless of race color national origin ancestry citizenship status protected veteran status religion physical or mental disability marital status sex sexual orientation gender identity or expression age or any other basis protected by law.

This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively Export Control Laws). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.

Required Experience:

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