Firmware Development Engineer - Optoelectronics

Molex is seeking a Firmware Engineer to join our Optical Solutions business unit in Fremont, CA. In this early career role, you'll be part of a multidisciplinary engineering team responsible for developing embedded software for next-generation optical transceivers. You'll contribute to the design, implementation, and testing of firmware that controls high-speed photonic devices, ensuring performance, reliability, and compliance with industry standards.

Occasional travel may be required for collaboration with global teams or participation in customer or industry events (approximately 10-15%).

• Develop and maintain embedded firmware for optical transceiver modules (QSFP-DD, OSFP, etc.)
• Implement I2C/MDIO communication protocols and monitor/control interfaces
• Collaborate with hardware, signal integrity, and test teams to validate firmware functionality
• Assist in debugging and troubleshooting firmware issues using logic analyzers, oscilloscopes, and protocol analyzers
• Support firmware integration with host systems and participate in interoperability testing
• Document firmware architecture, APIs, and test procedures

• Bachelor's degree in Electrical Engineering, Computer Engineering, Information Technology, or a related field preferred
• Solid understanding of embedded C/C++ programming
• Familiarity with microcontrollers, RTOS concepts, and low-level hardware interfaces
• Exposure to I2C, SPI, UART, or other serial communication protocols
• Basic knowledge of optical communication principles is a plus
• Demonstrated problem-solving skills, curiosity, and a desire to grow professionally. You'll be supported by experienced mentors and have opportunities to expand your technical expertise.
• Excellent communication and teamwork abilities
• This role is not eligible for visa sponsorship

For this role, we anticipate paying $80,000 - $130,000 per year. This role is eligible for variable pay, issued as a monetary bonus or in another form.

All Koch companies value diversity of thought, perspectives, aptitudes, experiences, and backgrounds. We are Military Ready and Second Chance employers. Learn more about our hiring philosophy.

At Koch, employees are empowered to do what they do best to make life better. Learn how our business philosophy helps employees unleash their potential while creating value for themselves and the company.

Our goal is for each employee, and their families, to live fulfilling and healthy lives. We provide essential resources and support to build and maintain physical, financial, and emotional strength—focusing on overall wellbeing so you can focus on what matters most. Our benefits plan includes medical, dental, vision, flexible spending and health savings accounts, life insurance, disability, retirement, paid vacation/time off, educational assistance, and may also include infertility assistance, paid parental leave and adoption assistance.

Specific eligibility criteria is set by the applicable Summary Plan Description, policy or guideline and benefits may vary by geographic region.

Equal Opportunity Employer, including disability and protected veteran status. Except where prohibited by state law, some offers of employment are conditioned upon successfully passing a drug test. This employer uses E-Verify. Please  for additional information.

Additionally, everyone has individual work and personal needs. We seek to enable the best work environment that helps you and the business work together to produce superior results.