Wafer-Level Testing Engineer

About Lumilens

At Lumilens, we are building the essential photonics infrastructure that will drive tomorrow’s AI supercomputing. From chip-to-chip optical interconnects to scalable photonic engines, Lumilens is ushering in a new era of computing that is faster, cooler, and dramatically more efficient. We’re a well-funded startup backed by Mayfield and led by veterans who have built and scaled some of the industry’s most transformative technologies.

About the Role

This is a critical technical role responsible for the operational execution, process control, and continuous improvement of Lumilens’ wafer-level testing operations. You will serve as a key owner of wafer-level test processes, test flow, manufacturing readiness, production performance, yield, and process optimization, working closely with internal engineering teams and external manufacturing partners to ensure robust, scalable, and efficient wafer-level testing. The role requires a highly analytical and hands-on engineer who can translate product and test requirements into reliable production processes and drive continuous improvement.

Key Responsibilities

• Wafer-Level Test Process Ownership: Own and continuously improve wafer-level test processes to ensure stable, repeatable, and efficient production execution. Lead the setup, qualification, and day-to-day operation of automated wafer probers, optical alignment systems, and Automated Test Equipment (ATE) for electrical and photonic wafer-level testing.

• Production Operations: Drive day-to-day wafer-level test operations, monitor production performance, identify process constraints, and ensure execution against production plans and quality requirements.

• Test Process Development & Qualification: Develop, optimize, and qualify wafer-level test processes, including test flows, test conditions, process parameters, and operating procedures for new and existing products.

• Process Control: Establish and maintain process specifications, control plans, operating windows, and monitoring methodologies to ensure consistent test performance and minimize process variation.

• Yield Improvement & Failure Debug: Monitor wafer-level test yield and defect performance, identify systematic and process-related losses, and lead improvement activities to increase yield and manufacturing efficiency. Drive effective corrective and preventive actions to prevent recurrence.

• Test Data Analysis: Analyze wafer-level test data to identify trends, abnormal conditions, process shifts, and systematic failures. Establish appropriate metrics and monitoring mechanisms to track production performance.

• Process Documentation: Develop and maintain test process specifications, work instructions, control plans, qualification reports, and other manufacturing documentation required for production execution.