Senior Firmware 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! Responsibilities will include but not limited to: Firmware design for optical communication products Design and implement firmware for microcontrollers (e.g., MCU, such as STM32, ESP32, etc) and other embedded platforms Develop low-level drivers (GPIO, UART, SPI, I2C, ADC, etc.) and integrate peripherals Ensure reliable and efficient communication between hardware modules and software systems Develop GUI for firmware debugging and Lab engineering investigation. Collaborate with software engineers to integrate hardware and firmware with application layers Create and maintain design documents (memory map, register file, etc) and test reports. FW related troubleshooting or failure analysis Job Requirements: Required Skills: Proficiency in microcontrollers Experience writing low-level drivers (GPIO, UART, SPI, I2C, ADC, PWM, etc.). Experience with FreeRTOS, Zephyr, or other real-time operating systems. Use of tools like JTAG, SWD, and in-circuit debuggers Familiar with industry standards and design regulatory, such as IEEE 802.3, OIF, MSA standard, CMIS specification, etc. Understanding of firmware flashing, updating methods, and version control. Good experience in analog and digital circuit design Knowledge of electronic components (MCUs, ASIC, sensors, laser driver, TEC controller, regulators, etc.). Experience using oscilloscopes, logic analyzers, multimeters, and spectrum analyzers. Knowledge and experience on semiconductor laser for optic communication application Strong skill on Failure analysis, root cause study and improvement solution Qualifications: MS, or PhD in Electrical Engineering, photoelectric, Computer Engineering, Telecommunication, or a related field. Minimum 3 years of experience in the related industry Independent Firmware development experience for mass production product. Good communications skills, written and verbal, in English and Mandarin Well organized Good willing to take reasonability. 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.