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: Continuous improving and realizing activity for stable operation of existing Epitaxy & Wafer process production line. Making effective preventative maintenance (PM) plan and execution to stabilize and maximize the mass-production capability (Address to sudden tool troubles and malfunction). Wafer process condition check by collaborating with epitaxy & process engineering teams to resume the production line after fixing the tools. KPI visualization activity of manufacturing tool data like utilization rate, tool availability etc. Anomaly detection both from predictive and post analysis from tool operation status database. Expected Background: Graduate technical college or above. BSc, MSc degree in electrical, mechanical engineering, or a relevant equivalent technical field. Expected Skill: Highly recommend if applicant have experience in charge of wafer process tools handling and maintenance and/or wafer epitaxy & process development for semiconductor optical devices. Fluent Japanese speaker. Better if can speak English and/or read the documents. 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.