Principal Firmware Engineer

Its fun to work in a company where people truly BELIEVE in what theyre doing!
Were committed to bringing passion and customer focus to the business.

Position Title: Principal Firmware Engineer

Employment Type: Full-time Existing vacancy

Location: San-Jose (On-Site)

About Lumentum

At Lumentum were building the tech behind the worlds 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.

Were 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 youll fit right in.

Why Youll Love This Role

Lumentum is seeking a Principal Firmware Engineer to lead architecture design and development of embedded firmware for advanced optical and photonic 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 Youll 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 Were 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 validating management behaviors (state machines paging/banked memory diagnostics alarms and telemetry).
• Experience with optical components (i.e. lasers MZ/IQ modulators et cetera) control (i.e. PIDs) performance monitoring and fault management.
• Understanding of manufacturing test flows and firmware support/API for calibration characterization and end-of-line verification; experience building tooling or scripts (i.e. Python) to support these flows.

Leadership & Behavioral Competencies

• Strong technical judgment; able to trade off schedule risk and quality with clarity.
• Excellent communication: can explain complex topics to non-firmware audiences.
• Ownership mindset and calm execution in ambiguous high-urgency situations.
• Mentorship and influence: raises the bar for design quality and engineering culture.

Perks Youll Love

• Flexible time off
• Health and wellness benefits (physical and mental)
• Tuition reimbursement and career growth support
• A workplace built for you: free gym games room prayer room
• Subsidized meals free coffee/tea
• Employee stock options and incentive plans
• A collaborative innovative and inclusive culture

Join a Team Thats Shaping the Future

At Lumentum were more than just a workplacewere a launchpad for creativity and innovation. Were committed to celebrating your unique talents and helping you grow. Our guiding principlesInnovate Engage Deliver Excel and Winarent just words; theyre the heart of what we do.

Lets Build a Brighter Future Together!

Were committed to building an inclusive workplace where everyone feels valued and empowered. We welcome applicants from all backgrounds and provide accommodations for individuals with disabilities throughout the hiring process. Your uniqueness makes us stronger sparks creativity and drives our success.

Please contact us at to request accommodation.

Join usyour future starts here!

Pay Range:

Disclaimer:

Final base salary for the successful candidate will depend on multiple factors including but not limited to job location where work will be performed qualifications work history and relevant experience. With our continual goal of making Lumentum a best place to work for our employees we strive to offer employees competitive total compensation packages which may include annual bonus commission for certain sales roles equity and health and welfare benefits.