Epoxy Engineer

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 - Ensure compliance with internal reliability standards and customer requirements Global Technical Support & Knowledge Sharing - Act as a global technical expert for epoxy-related topics - Provide training and documentation for operations and engineering teams - Interface with epoxy suppliers and material vendors for formulation support and roadmap alignment SKILLS/EXPERIENCE - 5–10+ years of hands-on experience with epoxy materials and adhesive processes - Direct experience in optical, photonics, semiconductor, or precision electronics manufacturing - Strong exposure to production troubleshooting and factory support TECHNICAL SKILLS - Deep knowledge of epoxy chemistry, curing mechanisms, fillers, and modifiers - Experience with optical alignment-sensitive assemblies - Familiarity with dispensing technologies (time-pressure, auger, jetting, automated systems) - Understanding of thermal, mechanical, and optical impacts of adhesive selection - Ability to analyze failure modes and drive data-based decisions - Experience in silicon photonics, fiber optics, or laser/optical modules - Knowledge of industry standards