Phizenix
SeniorPrincipalFirmwareEngineer
Neural analysis suggests this role is
optimal for Senior candidates.
“Senior Principal Firmware Engineer at Phizenix. Skills: Firmware Engineering, Optical Modules, Embedded Systems. Own firmware development for coherent optical module programs. Lead program-level firmware efforts”
What You'll Achieve.
Deliver firmware solutions meeting requirements
Industry & Context.
Debugging; Troubleshooting
What They're Looking For.
Must Have
15+ years embedded software/firmware architecture, Deep expertise coherent optical module firmware, OIF-400ZR, C-CMIS, CMIS 4.x/5.x, Bootloader design, Firmware upgrade mechanisms, Flash management, SoC-based embedded platforms, MCU/DSP-based architectures, Proficiency C/C++ firmware development, Python-based test/automation scripting, Own and deliver programs end-to-end, Alpha bring-up through GA release, Production support debugging skills, Hardware/firmware debugging skills, Lab bench bring-up, ATE integration, Field issue resolution, Jira, GitLab, CI/CD release flows, Excellent communication
Nice to Have
Prior experience optical module company, Prior experience optical semiconductor company, Marvell optical or coherent DSP platforms, Calibration and control algorithms optical components
What You'll Do.
Own firmware development for coherent optical module programs
Lead program-level firmware efforts
Design and implement advanced firmware features
Drive cross-functional collaboration
Resolve complex system-level issues
Support customer engagements
Respond to technical inquiries
Deliver firmware solutions
Contribute to firmware architecture decisions
Mentor and guide other engineers
Serve as technical resource
Serve as subject matter expert
How You'll Work.
Team & Collaboration
Firmware, hardware, DSP teams; Customer-facing teams; Cross-functional teams; Hardware engineers; DSP teams
Communication Scope
Technical inquiries; Customer communication
Process & Methodology
Program ownership, End-to-end program delivery
Full Job Description
What You Can Expect We are looking for a Senior Principal Firmware Engineer to join Client's Optical Connectivity firmware team in Santa Clara. This is a highly technical individual contributor role with broad program ownership across one or more coherent optical module programs. The ideal candidate brings deep expertise in embedded firmware for optical transceivers, a track record of leading complex multi-generation programs, and the ability to work effectively across firmware, hardware, DSP, and customer-facing teams. What You'll Do Own firmware development for coherent optical module programs (e.g., 400ZR/ZR+, 800ZR), from architecture through production release Lead program-level firmware efforts, including bring-up, calibration, validation, and customer delivery milestones Design and implement advanced firmware features such as hitless firmware upgrade, CMIS compliance, bootloader architecture, calibration and control engines, and hardware adaptation layers Drive cross-functional collaboration with DSP, hardware, ATE, and test engineering teams to resolve complex system-level issues Support customer engagements — respond to technical inquiries, debug field issues, and deliver firmware solutions that meet hyperscaler and carrier requirements Contribute to firmware architecture decisions across the broader optics firmware platform, including shared infrastructure, tooling, and release processes Mentor and guide other engineers on the team; serve as a technical resource and subject matter expert What We're Looking For Senior Principal Engineer, Software/Firmware - coherent optical module firmware/SoC-based embedded platforms/CPORequired15+ years of experience in embedded software/firmware architecture, design, and implementation Deep expertise in coherent optical module firmware (400ZR, 800ZR, or equivalent) and associated standards (OIF-400ZR, C-CMIS, CMIS 4.x/5.x) Strong background in bootloader design, firmware upgrade mechanisms (including hitless/in-service u
Applying for this Senior Principal Firmware Engineer role?
Most applicants get filtered before a human reads their resume. See if yours makes the cut.
How to Apply on Greenhouse
- Create a Greenhouse profile before applying — it saves time across multiple applications.
- Upload your resume as a PDF; the parser handles it better than Word.
- Answer all knockout questions carefully — wrong answers auto-reject before a human sees you.
- Enable email notifications to track application status in real time.
ANONYMOUS · UNFILTERED
What do employees actually say about Phizenix?
Real rants from real employees. Read before you apply.