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! Responsibilities: As a product engineer for semiconductor lasers (including DFB lasers and electro-absorption modulator integrated lasers), you will be engaged in the following activities: Device characterization and performance analysis Data-driven process improvement and yield enhancement Root cause investigation and failure analysis Statistical analysis and trend monitoring (Depending on skill level) Development of data models or analysis automation, including machine learning. Expected Background: BSc, MSc, or PhD degree in a science or engineering discipline Strong interest in semiconductor or optoelectronic devices, manufacturing, or data science Logical, analytical thinker with persistence in tackling complex technical challenges Expected Skill: Experience with data analysis tools (Excel, Python, JMP, etc.) Basic knowledge of statistical analysis and data visualization Fluent Japanese speaker and Basic communication skills in English (reading/writing and participating in online meetings or email discussions) Preferred Skills: Research or hands-on experience with semiconductor processes, optical devices, or electronic device characterization Practical experience in yield management, quality improvement, or process optimization in manufacturing Practical experience in yield management, quality improvement, or process optimization in manufacturing 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.