Principal Firmware Engineer

## Principal Firmware Engineer Apply locations:
USA - CA - San Jose (Ridder) time type:
Full time posted on:
Posted Todayjob requisition :
2026865
** 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!
*
* Position Title:

Principal Firmware Engineer
***
* Employment Type:

** Full-time, Existing vacancy
*
* Location:

** San-Jose (On-Site)
** About Lumentum
** At Lumentum, we’re building the tech behind the world’s fastest networks and most advanced systems. Our optical and photonic solutions power everything from AI and cloud computing to data centers, telecom, and advanced manufacturing.

We’re a global team of innovators working where light meets technology, solving big challenges that keep the world connected and moving forward. If shaping the future of connectivity excites you, you’ll fit right in.
** Why You’ll Love This Role
** Lumentum is seeking a
** Principal Firmware Engineer
** to lead architecture, design, and development of embedded firmware for advanced optical and photonic systems. In this role, you will drive technical direction across firmware platforms, partner closely with hardware, systems, and manufacturing teams, and deliver robust, high-quality firmware that meets performance, reliability, and compliance requirements for high-volume products.
** What You’ll Be Doing
*** Own firmware architecture and technical roadmap for one or more embedded platforms supporting optical/laser/telecom or related high-reliability systems.
* Lead end-to-end firmware development: requirements → design → implementation → verification/validation → production release → sustaining.
* Develop firmware for MCU/MPU-based embedded systems (bare-metal and/or RTOS and/or embedded Linux), including board bring-up and low-level drivers.
* Define interfaces and protocols across firmware, hardware, FPGA, optics, and host software (e.g., I2C, SPI, UART, CAN, Ethernet; higher-layer protocols as applicable).
* Drive system reliability and quality: fault handling, diagnostics, telemetry, logging, upgrade mechanisms, and robust state-machine design.
* Lead design reviews, code reviews, and root-cause analysis for field issues; implement corrective and preventive actions.
* Collaborate cross-functionally with Systems, Hardware, Optical Engineering, Test, Reliability, Manufacturing, and Program Management to meet schedule and product goals.
** What We’re Looking For
***
* Education:

BS in Electrical Engineering, Computer Engineering, Computer Science, or related field (MS preferred), or equivalent experience
***
* Experience:

Core Requirements:**
* ** 10+ years
** of professional embedded firmware development experience, including ownership of shipped products.
* Expert proficiency in
** C/C++
** for embedded systems, source code control (GIT), Segger IDE, Python, data analysis tools (i.e. JMP, R),  Windows & Linux.
* Deep experience with
** RTOS
* * development (e.g., FreeRTOS) and
** Bare-metal
** firmware (interrupts, bootloaders, HAL/LL drivers).
* Strong skills in board bring-up, debugging, and lab tools (JTAG/SWD, logic analyzer, oscilloscope, optical power meter, optical wavemeter).
* Solid understanding of hardware/firmware integration and digital interfaces (I2C/SPI/UART, GPIO, ADC/DAC, timers, DMA).
* Proven ability to lead technical decisions, drive architecture, and deliver across multi-disciplinary teams.
* Hands-on experience with
** optical components/modules calibration and control/PIDs
** including optical power control/APC loops, bias/current tuning, heater/thermal control, TEC/thermal control, optical signal monitoring, fault management and trend-based telemetry
** Preferred Qualifications
*** Direct experience developing firmware/software for
** optical transceiver modules*
* ** and subsystems
** including bring-up, feature development, and production support.
* Strong familiarity with
** module management and host interfaces**, including
** CMIS** (Common Management Interface Specification); experience implementing, debugging, and…