{"id":41335,"url":"https://alion.io/job/lumentum-principal-firmware-engineer","title":"Principal Firmware Engineer","company":{"id":5264,"name":"Lumentum","domain":"lumentum.com","url":"https://alion.io/company/lumentum","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":77,"open_postings":38,"ghost_share":0,"stale_share":0.921,"repost_share":0,"time_to_fill_p50_days":40,"computed_at":"2026-11-04T06:34:25Z"}},"role":"Hardware","role_family":"Hardware","seniority":"lead","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["San Jose, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":153000,"max_usd":283000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":656},"experience_years_min":10,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"C++","optional":false},{"name":"CAPA","optional":false},{"name":"FreeRTOS","optional":false},{"name":"JMP","optional":false},{"name":"Linux","optional":false},{"name":"Python","optional":false},{"name":"RTOS","optional":false},{"name":"Windows","optional":false}],"status":"live","first_seen_at":"2026-08-05T00:00:00Z","employer_posted_date":"2026-08-05","last_verified_at":"2026-11-04T03:29:41Z","board_verified":true,"closed_at":null,"days_open":91,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":91},"description":"It's fun to work in a company where people truly BELIEVE in what they're doing!\nWe're committed to bringing passion and customer focus to the business.\nIf you like wild growth and working with happy, enthusiastic over-achievers, you'll enjoy your career with us!\nPosition Title: Principal Firmware Engineer\nEmployment Type: Full-time, Existing vacancy\nLocation: San-Jose (On-Site)\nAbout Lumentum\nAt 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.\nWe’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.\nWhy You’ll Love This Role\nLumentum 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.\nWhat You’ll Be Doing\nOwn firmware architecture and technical roadmap for one or more embedded platforms supporting optical/laser/telecom or related high-reliability systems.\nLead end-to-end firmware development: requirements → design → implementation → verification/validation → production release → sustaining.\nDevelop firmware for MCU/MPU-based embedded systems (bare-metal and/or RTOS and/or embedded Linux), including board bring-up and low-level drivers.\nDefine interfaces and protocols across firmware, hardware, FPGA, optics, and host software (e.g., I2C, SPI, UART, CAN, Ethernet; higher-layer protocols as applicable).\nDrive system reliability and quality: fault handling, diagnostics, telemetry, logging, upgrade mechanisms, and robust state-machine design.\nLead design reviews, code reviews, and root-cause analysis for field issues; implement corrective and preventive actions.\nCollaborate cross-functionally with Systems, Hardware, Optical Engineering, Test, Reliability, Manufacturing, and Program Management to meet schedule and product goals.\nWhat We’re Looking For\nEducation:\nBS in Electrical Engineering, Computer Engineering, Computer Science, or related field (MS preferred), or equivalent experience\nExperience:\nCore Requirements:\n10+ years of professional embedded firmware development experience, including ownership of shipped products.\nExpert proficiency in C/C++ for embedded systems, source code control (GIT), Segger IDE, Python, data analysis tools (i.e. JMP, R), Windows & Linux.\nDeep experience with RTOS development (e.g., FreeRTOS) and Bare-metal firmware (interrupts, bootloaders, HAL/LL drivers).\nStrong skills in board bring-up, debugging, and lab tools (JTAG/SWD, logic analyzer, oscilloscope, optical power meter, optical wavemeter).\nSolid understanding of hardware/firmware integration and digital interfaces (I2C/SPI/UART, GPIO, ADC/DAC, timers, DMA).\nProven ability to lead technical decisions, drive architecture, and deliver across multi-disciplinary teams.\nHands-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\nPreferred Qualifications\nDirect experience developing firmware/software for optical transceiver modules and subsystems including bring-up, feature development, and production support.\nStrong 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).\nExperience with optical components (i.e. lasers, MZ/IQ modulators, et cetera) control (i.e. PIDs), performance monitoring, and fault management.\nUnderstanding 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.\nLeadership & Behavioral Competencies\nStrong technical judgment; able to trade off schedule, risk, and quality with clarity.\nExcellent communication: can explain complex topics to non-firmware audiences.\nOwnership mindset and calm execution in ambiguous, high-urgency situations.\nMentorship and influence: raises the bar for design quality and engineering culture.\nPerks You’ll Love\nFlexible time off\nHealth and wellness benefits (physical and mental)\nTuition reimbursement and career growth support\nA workplace built for you: free gym, games room, prayer room\nSubsidized meals, free coffee/tea\nEmployee stock options and incentive plans\nA collaborative, innovative, and inclusive culture\nJoin a Team That’s Shaping the Future\nAt 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.\nLet’s Build a Brighter Future Together!\nWe’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.\nPlease contact us  request accommodation.\nJoin us-your future starts here!\nPay Range:\nP70-USA-1 :$134,750.00 - $192,500.00Disclaimer:\nFinal 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. 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