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! Main Responsibilities Develop core technologies for next-generation optical devices that enable advanced performance and/or scalable architectures. Proactively propose new ideas and concepts, and lead development activities by collaborating with and engaging relevant internal stakeholders. Alternatively, contribute as a deep technical specialist by continuously advancing expert knowledge in a specific domain and disseminating it within the organization. Respond to rapid changes in the industry by flexibly adapting development strategies and technical directions as needed. Bridge advanced device concepts with practical packaging by considering manufacturability and long-term scalability. Collaborate across functions such as device design, process engineering, and evaluation to accelerate technology development. Contribute to shaping mid- to long-term technology directions based on technical insight and industry trends. Qualification & Skills BSc, MSc, PhD degree in electronics, electrical engineering, physics, or a related equivalent technical field. Scientific experiment planning, execution, and analysis Documentation of experimental result and its analysis Fluent Japanese speaker and intermediate English skill Basic PC skills, such as MS Excel, PowerPoint, and Word 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.