Principal Test Engineer

It's fun to work in a company where people truly BELIEVE in what they're doing! We're committed to bringing passion and customer focus to the business. If you like wild growth and working with happy, enthusiastic over-achievers, you'll enjoy your career with us! Job Summary: We are seeking an experienced and dynamic Test Engineer for our Test Development in Japan for EML and CW laser product lines. This role will be responsible for the development and implementation of world-class testing methodologies and tools to ensure product excellence. The ideal candidate will have extensive experience in driving innovation in testing practices, scaling testing operations for complex products in a fast-paced environment. Key Responsibilities: Develop, implement, and release to factory test strategies, processes, and tools that meet the required speed, scale, cost and quality for EML and CW laser production Perform statistical data analysis and trouble shoot potential root causes for yield enhancement Identify and drive initiatives for test automation, process improvements, test time and cost reductions, and yield improvements Lead troubleshooting and FA activities in close coordination with suppliers and Operation team so to exceed tester uptime/utilization targets Required Qualifications: 5 years of experience with test engineering or tester & equipment develop or above Strong in developing software tools for statistical data analysis (SQL, JMP) Experienced and fully understand Gage R&R, correlation, test coverage and qualification Able to interpret and analyze test result/data, correlating the test data with fab inline process for yield improvement. Strong problem-solving, troubleshooting, data analysis and data driven analytical mindset BS or MS degree in electrical engineering, information, or other relevant major. Preferred Qualifications: Experience in semiconductor lasers, like edge emitting laser, or Vertical Cavity Surface Emitting Laser (VCSEL) related device design, process development and characterization is preferred Familiarity with photonics surmount, housing, semiconductor laser diodes, LEDs, photodetectors, driver ICs, and optical components (lenses, diffusers, DOEs). Strong communication skills; adept at hosting effective meetings and facilitating actions and resolving conflicts. Strong ability to drive actions and solutions through cross-functional teams. Fluency in Japanese language We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, sex, gender, gender expression, sexual orientation, age, marital status, veteran status, or disability status. We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. Please contact us to request accommodation. Lumentum is illuminating the networks of tomorrow with advanced photonic technologies that enable AI, data centers, telecom, industrial, and sensing applications. As AI accelerates the global demand for bandwidth and energy efficiency, we deliver the building blocks that keep data moving reliably, efficiently, and at massive scale. Our optical products support AI and compute infrastructure, cloud and DCI environments, metro and long-haul networks, while our lasers drive breakthroughs in precision manufacturing and sensing. For nearly five decades, Lumentum has been at the intersection of light and innovation. What began as a vision with JDS Uniphase to harness the power of photonics has evolved into a global force driving the communication infrastructure of tomorrow. At Lumentum, we’re building more than a business—we’re building a team of passionate innovators whose drive to collaborate, create, and connect the world fuels everything we do. We are part of the AI technology revolution and we are illuminating the path forward. Headquartered in San Jose, California, we operate worldwide through a network of R&D, manufacturing, and sales locations.