Engineer, Firmware

lumentum; Hong Kong; On-site; HKD 420,000 - 540,000; Full time

Job summary

Lumentum in Hong Kong is seeking an embedded firmware engineer to develop software for optical modules and supporting tools. You will work closely with hardware, optics, and test teams to ensure performance and reliability.

Requires at least a Bachelor's in Electrical/Computer Engineering and 2 years of hands-on embedded firmware experience, strong C programming, and familiarity with Git and multiple IDEs.

Qualifications

• Bachelor's or Master's degree in Electrical Engineering, Computer Engineering, Automation, Telecommunications, or related field.
• Minimum 2 years of hands-on embedded firmware development.
• Strong C programming for MCU/embedded.
• Experience with Git and multiple IDEs (SEGGER, IAR, Keil, CrossWorks, GCC).
• Knowledge of I2C, SPI, MDIO; Python or C# for developing tools.
• Good English reading/writing of specs and docs.
• Strong communication and teamwork across functions.
• Experience with RTOS or multi-threaded firmware is a plus.
• Familiarity with optical module standards (CMIS, SFF) is a plus.

Responsibilities

• Develop embedded firmware for optical modules (e.g., QSFP-DD, OSFP, CFP).
• Develop software tools to support efficient debugging, validation, and lab testing.
• Support cross-functional teams in firmware verification, validation, and troubleshooting, including RMA analysis of field issues.
• Maintain and enhance the firmware codebase, including documentation, version control, and firmware upgrade management.
• Collaborate closely with hardware, optics, and test engineering teams to ensure product performance, reliability, and compliance with specifications.

Skills

C programming

Embedded systems

Teamwork

English reading/writing

Education

Bachelor's degree in Electrical Engineering, Computer Engineering, Automation, Telecommunications, or related field

Tools

Git

SEGGER

IAR

Keil

CrossWorks

GCC

Python

C#

Job description

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 Responsibilities

• Develop embedded firmware for optical modules (e.g., QSFP-DD, OSFP, CFP).
• Develop software tools to support efficient debugging, validation, and lab testing.
• Support cross-functional teams in firmware verification, validation, and troubleshooting, including RMA analysis of field issues.
• Maintain and enhance the firmware codebase, including documentation, version control, and firmware upgrade management.
• Collaborate closely with hardware, optics, and test engineering teams to ensure product performance, reliability, and compliance with specifications.

Qualifications and requirements

• Bachelor's or Master's degree in Electrical Engineering, Computer Engineering, Automation, Telecommunications, or a related field.
• Minimum 2 years of hands‑on experience in embedded firmware development.
• Strong proficiency in C programming for MCU and embedded systems.
• Experience with Git or similar version control systems.
• Experience with at least two development environments such as SEGGER, IAR, Keil, CrossWorks, or GCC.
• Solid understanding of communication interfaces such as I²C, SPI, and MDIO.
• Experience with Python or C# for developing tools, GUIs, or test scripts.
• Good English proficiency for reading technical specifications, IC datasheets, and writing documentation.
• Strong communication and teamwork skills, with the ability to collaborate across functions.
• Experience in assembly language programming is a plus.
• Basic knowledge of circuit design and PCB layout is a plus.
• Experience in closed‑loop control algorithm development is a plus.
• Familiarity with RTOS or multi-threaded firmware architectures is a plus.
• Familiarity with optical communication standards (e.g., CMIS 3.0-5.x, SFF-8636) is a plus.
• Familiarity with CFP, QSFP, and OSFP specifications and protocols is a plus.
• Understanding of coherent and PAM4 optical modules (active and passive) is a plus.

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.