Staff/ Sr. Staff HW Test Automation Engineer

Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine, Passage™, capable of connecting thousands to millions of processors at the speed of light in extreme-scale data centers for the most advanced AI and HPC workloads. Lightmatter raised $400 million in its Series D round, reaching a valuation of $4.4 billion. We will continue to accelerate the development of data center photonics and grow every department at Lightmatter! If you're passionate about tackling complex challenges, making an impact, and being an expert in your craft, join our team of brilliant scientists, engineers, and accomplished industry leaders. Lightmatter is (re)inventing the future of computing with light! Product Engineering builds the software that brings up, characterizes, and qualifies Lightmatter's photonic chips on real hardware — from bench-top bring-up through production test on automated test equipment (ATE). You'll write the code that drives instruments, testers, wafer probers, and lab automation to bring a chip to life and prove it works. Test software infrastructure at Lightmatter spans multiple platforms, wafer test, hardware validation, and laser/optical test, and this role often acts as the bridge between engineers working at the bench and the broader test software team. As a Hardware Test Automation Engineer you'll have the opportunity to work across some combination of: an internal test software framework (Java/Python-based), industry-standard ATE test method and testflow development, wafer prober integration, instrument control (optical and electrical sources, meters, sensors), embedded/firmware interfaces on the hardware side, and data pipelines from lab equipment to structured results. Responsibilities Learn the hardware you're automating well enough to make informed software decisions about it. Design and build test software that automates device bring-up, characterization, and production test sequences across bench and ATE environments. Develop and maintain test methods, test flows, and instrument control code depending on level and project while writing code and reviewing code are both daily parts of the role. Work directly with hardware and characterization engineers to understand their needs and translate device physics and test requirements into working, repeatable test software. Build and maintain data logging and results pipelines so test data is captured accurately and usable downstream (metric computation, yield analysis, production handoff). Debug test hardware/software integration issues, working across the device under test, the fixture, the instrument, and the test code to find root cause. Support test program releases to internal test cells and, at senior levels, to external test facilities. Communicate daily with the team on progress and blockers, and spend regular time in the lab…