Senior/Principal Firmware Engineer, Optical Transceivers

Molex

Fremont (CA)

On-site

USD 165,000 - 240,000

Full time

14 days+

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Job summary

Molex is seeking a Senior or Principal Firmware Engineer to join the Optical Systems Business Unit in Fremont, CA. You will drive firmware development for next‑gen optical transceivers and collaborate with PM, Hardware, Operations, and Field Applications teams to move products from concept to volume production.

The role supports domestic and international travel, with final level and compensation based on experience and demonstrated leadership.

Qualifications

Bachelor's degree in computer engineering, electrical engineering, or a related field.
7+ years of experience in firmware design and development for communication or related products.
Experience programming in C/C++ and Python.
Experience with bare-metal and RTOS-based firmware development and optimization.
Experience with bus protocols such as I2C, I3C, SPI, PCIe and MDIO.
Hands‑on experience with lab equipment such as oscilloscopes, signal generators, OSA and VOA.
Experience with PID control loops involving DAC, ADC, TEC and PIC.

Responsibilities

Design, develop and verify CMIS-compliant firmware for optical transceivers.
Design, implement and calibrate control loops for electro-optical components.
Port, integrate and test DSP chip driver software on target platforms.
Design and develop firmware and GUI-based tools for evaluation boards (EVBs) to streamline debugging, lab testing and performance validation.
Ensure product performance, reliability and quality through critical code reviews, test design and analysis.
Enhance and maintain the firmware codebase, ensuring comprehensive documentation, robust version control and upgrade management.
Implement and maintain secure boot and signed firmware image workflows to meet customer and hyperscaler security requirements.
Apply AI coding agents across development, test and debug workflows - while owning correctness, timing and hardware behavior that agents cannot verify on their own.
Support New Product Introduction (NPI) and Application Engineering teams in bringing products to market.
Troubleshoot and resolve operational and customer issues by analyzing use cases, reproducing issues in the lab and implementing solutions.