Director of Silicon Test 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. About Lumilens At Lumilens, we are building the critical photonics infrastructure powering the next generation of AI supercomputing. From chip-to-chip optical interconnects to scalable photonic engines, our technology enables faster, cooler, and dramatically more efficient systems. Backed by leading investors and built by industry veterans, we are scaling rapidly to bring cutting-edge silicon photonics into high-volume production. The Role As Director of Silicon Test Engineering, you will lead the strategy and execution of test development for Lumilens’ silicon photonics and semiconductor products. You will be responsible for building scalable, high-quality test solutions from characterization through high-volume production. This role partners closely with design, product, and operations teams to ensure robust test coverage, optimized test cost, and high-yield manufacturing. You will play a critical role in ensuring only fully validated, high-performing devices reach our customers. What You’ll Do Lead Test Strategy & Execution - Define and drive the end-to-end silicon test strategy from characterization to wafer sort and final test - Lead development of ATE test solutions on platforms such as Advantest 93K and/or Teradyne - Establish scalable test architectures to support rapid product ramps and high-volume manufacturing - Own test coverage, quality metrics, and outgoing product reliability Drive Yield & Test Optimization - Optimize test flows to reduce test time, improve coverage, and lower cost of test - Partner with product and process engineering to analyze yield data and drive continuous improvement - Identify and eliminate test escapes, ensuring robust screening of marginal or underperforming devices - Implement data-driven methodologies for yield learning and production ramp Partner with Design & Cross-Functional Teams - Collaborate with design and DFT teams to ensure testability and coverage are built into products early - Translate simulation test patterns into ATE programs and production-ready solutions - Lead test plan reviews and drive alignment across engineering, product, and operations teams - Support new product introduction (NPI) and ensure seamless transition to high-volume manufacturing Develop Test Infrastructure & Hardware - Oversee development of high-speed test hardware and interfaces for advanced silicon photonics devices - Ensure test solutions meet performance requirements for high-speed and mixed-signal applications - Drive innovation in test methodologies as product complexity exceeds standard tester capabilities Leadership - Build and lead a high-performing silicon test engineering team - Set clear goals, drive accountability, and foster a culture of execution and continuous improvement - Mentor and develop engineers across test, product, and operations functions - Lead through influence across internal teams and external partners What