Fiber Optics Manufacturing Engineer

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.

As a Fiber Optics Manufacturing Engineer at CFS, you will play a critical role in developing, scaling, and continuously improving manufacturing processes for fiber optic cables and assemblies. You will work closely with Fiber Optic Specialists, production technicians, design engineering, quality, test, supply chain, and other cross‑functional teams to transition fiber optic products from development into reliable, repeatable production.

You will combine strong manufacturing engineering fundamentals with an understanding of fiber optic processes and product requirements. You will help turn hands‑on fiber optic expertise into robust manufacturing processes, tooling, documentation, process controls, and production systems that enable high‑quality, high‑yield manufacturing.

This role will split work between our Devens, MA and Somerville, MA locations.

• Partner with Fiber Optic Specialists and production teams to develop, standardize, and continuously improve fiber optic manufacturing processes
• Transition fiber optic products and processes from R&D and prototype builds into repeatable, scalable production
• Develop, implement, and qualify manufacturing processes for fiber optic cables and assemblies, balancing quality, optical performance, throughput, cost, and production rate
• Develop and optimize processes for fiber handling, routing, splicing, wrapping, jacketing, bonding, termination, and cable assembly as applicable
• Develop manufacturing processes and controls that prevent fiber damage, including excessive bending, pinching, tension, handling, routing, and other sources of optical or mechanical degradation
• Develop and optimize tooling, fixtures, equipment, and workstations to enable repeatable fiber optic manufacturing while protecting sensitive fiber and cable components
• Partner with Design Engineering to apply Design for Manufacturing (DFM) and Design for Assembly (DFA) principles and ensure product designs are manufacturable at production scale
• Establish manufacturing process parameters, acceptance criteria, inspection methods, and process controls for critical fiber optic processes
• Create and maintain manufacturing documentation, including work instructions, process flow diagrams, pFMEAs, standard operating procedures (SOPs), and process control plans
• Partner with Quality and Test Engineering to develop effective inspection and test methods for critical fiber optic requirements
• Use manufacturing and optical performance data to identify sources of variation, establish process capability, and improve first‑pass yield, scrap, rework, cycle time, and throughput
• Troubleshoot manufacturing and quality issues using structured root‑cause analysis, experiments, data analysis, and hands‑on investigation
• Lead continuous improvement and RCCA projects that improve manufacturing yield, reduce fiber damage and scrap, and increase process robustness
• Provide hands‑on technical support and training…