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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 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 You’ll 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 That’s Shaping the Future
At Lumentum, we’re more than just a workplace—we’re a launchpad for creativity and innovation. We’re committed to celebrating your unique talents and helping you grow. Our guiding principles—Innovate, Engage, Deliver, Excel, and Win—aren’t just words; they’re the heart of what we do.
Let’s Build a Brighter Future Together!
We’re 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 [email protected] to request accommodation.
Join us—your future starts here!
Pay Range:
P70-USA-1 :$134,750.00 - $192,500.00Disclaimer:
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.
Skills Required
- BS in Electrical Engineering, Computer Engineering, Computer Science, or related field
- MS degree (preferred)
- 10+ years professional embedded firmware development experience with ownership of shipped products
- Expert proficiency in C/C++ for embedded systems
- Experience with source code control (GIT) and Segger IDE
- Experience with Python and data analysis tools (JMP, R)
- Experience with RTOS development (e.g., FreeRTOS) and bare-metal firmware (interrupts, bootloaders, HAL/LL drivers)
- Board bring-up, debugging, and lab tools proficiency (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)
- Hands-on experience with optical components/modules calibration and control (PIDs), APC loops, bias/current tuning, heater/thermal control, TEC control, monitoring, and fault management
- Proven ability to lead technical decisions, drive architecture, and deliver across multi-disciplinary teams
- Direct experience developing firmware/software for optical transceiver modules and subsystems
- Familiarity with module management and host interfaces including CMIS and related management behaviors
- Understanding of manufacturing test flows and firmware support/API for calibration, characterization, and end-of-line verification; experience building tooling/scripts (Python) for these flows
Lumentum Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Lumentum and has not been reviewed or approved by Lumentum.
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Equity Value & Accessibility — Equity is positioned as a meaningful part of total compensation, with RSUs frequently framed as a valued component of offers. An employee stock purchase plan with a discount and look-back further reinforces equity access as part of rewards.
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Retirement Support — Retirement benefits are presented as a clear strength, with a 401(k) match and immediate vesting highlighted as supportive features. Auto-enrollment and match eligibility details indicate a structured retirement program for U.S. employees.
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Healthcare Strength — Multiple medical plan options are described, including PPO and HDHP/HSA choices and Kaiser in some locations, suggesting breadth and choice in coverage. Health and well-being programming is also characterized as part of a comprehensive benefits approach.
Lumentum Insights
What We Do
Lumentum (NASDAQ: LITE) is a market-leading designer and manufacturer of innovative optical and photonic products enabling optical networking and laser applications worldwide. Lumentum optical components and subsystems are part of virtually every type of telecom, enterprise, and data center network. Lumentum lasers enable advanced manufacturing techniques and diverse applications including next-generation 3D sensing capabilities. Lumentum is headquartered in San Jose, California with R&D, manufacturing, and sales offices worldwide. For more information, visit www.lumentum.com.
