Engineer, Firmware

lumentum· Cloud Light Technology Ltd (HK)
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📍 Hong Kong - Science ParkFull time
Full timeCloud Light Technology Ltd (HK)

About this role

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.

Please contact us to request accommodation.

Frequently Asked Questions

Is the salary disclosed for the Engineer, Firmware position at lumentum?
The salary for this Engineer, Firmware role at lumentum is not publicly listed. Click "Apply Now" to learn more about the compensation package on their official careers page.
Where is the Engineer, Firmware position at lumentum located?
This Engineer, Firmware role at lumentum is based in Hong Kong - Science Park. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Is the Engineer, Firmware role at lumentum full-time or part-time?
This is listed as a Full time position. It is posted as a Engineer, Firmware role in the Cloud Light Technology Ltd (HK) department at lumentum.
Which team or department does the Engineer, Firmware at lumentum belong to?
This Engineer, Firmware position is part of the Cloud Light Technology Ltd (HK) department at lumentum. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Engineer, Firmware position at lumentum?
Click the "Apply Now" button on this page. You will be redirected to lumentum's official application portal hosted on workday where you can submit your application directly.
When was the Engineer, Firmware job at lumentum posted?
This Engineer, Firmware position at lumentum was posted on Aug 20, 2026. Apply as soon as possible — early applications are often reviewed first.
Engineer, Firmware
lumentum
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You'll be redirected to lumentum's official application page on Workday.