Epoxy Engineer

About the role

ABOUT LUMILENS

At Lumilens we are building the critical photonics infrastructure that powers tomorrow’s AI supercomputing. From chip-to-chip optical interconnects to scalable photonic engines, Lumilens is unlocking a new era of computing - faster, cooler, and massively more efficient. We’re a well-funded startup backed by Mayfield and led by veterans who’ve built and scaled some of the most transformative technologies in the industry. At Lumilens, we’re developing high-speed photonics products purpose-built to power the future of AI infrastructure and high-performance computing. This isn’t incremental innovation, it’s a ground-floor opportunity to rethink the optical layer from the silicon up. You’ll work alongside a team of world-class engineers solving some of the hardest challenges in scaling optical systems. Every line of code, every design decision, every breakthrough you help deliver will shape the infrastructure of tomorrow. If you're looking for mission, momentum, and the chance to make an outsized impact, jump on the rocket ship. We’re just getting started.

POSITION OVERVIEW

We are seeking an Epoxy Engineer – Specialist with deep expertise in epoxy materials, formulations, and dispensing processes used in optical and photonic devices. This role is critical to ensuring high reliability, yield, and performance of optical assemblies through robust adhesive selection, development, and process optimization.

The role will work closely with R&D, manufacturing, quality, and global operations teams, and act as a technical authority for epoxy-related challenges across product lines.

DUTIES/RESPONSIBILITIES

Materials & Process Development

- Develop, evaluate, and optimize epoxy formulations for optical and photonic applications (die attach, fiber attach, lid seal, underfill, etc.)

- Select adhesives based on optical, thermal, mechanical, and reliability requirements

- Define and validate dispensing, curing, and handling processes for production environments

- Establish process windows, material specifications, and control plans

Troubleshooting & Yield Improvement

- Lead root-cause analysis for adhesive-related failures (delamination, voiding, misalignment, optical loss, reliability issues)

- Support yield improvement and defect reduction initiatives in manufacturing

- Resolve epoxy performance issues across temperature, humidity, and mechanical stress conditions

Manufacturing & Scale-Up Support

- Support NPI and production ramp activities across global manufacturing sites

- Work with equipment vendors on dispensing systems, curing ovens, and automation

- Ensure epoxy processes are scalable, repeatable, and cost-effective

Reliability & Qualification

- Support material qualification and reliability testing (thermal cycling, damp heat, shear, pull, aging)

- Collaborate with Quality teams on FA, CAPA, and customer escalations