Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine, Passage™, capable of connecting thousands to millions of processors at the speed of light in extreme-scale data centers for the most advanced AI and HPC workloads.Lightmatter raised $400 million in its Series D round, reaching a valuation of $4.4 billion. We will continue to accelerate the development of data center photonics and grow every department at Lightmatter!If you're passionate about tackling complex challenges, making an impact, and being an expert in your craft, join our team of brilliant scientists, engineers, and accomplished industry leaders.Lightmatter is (re)inventing the future of computing with light!At Lightmatter, an SDET is a software engineer first, not a QA coordinator or manual tester. You'll design and build the frameworks, harnesses, and hardware-in-the-loop infrastructure that let firmware engineers test their own code continuously on real photonic hardware. You'll sit with the firmware team, spend time at the bench with oscilloscopes, debuggers, and optical instruments, and serve as the bridge between firmware and broader software and systems organizations.ResponsibilitiesOwn the architecture and roadmap of the firmware test automation framework across products, targets, sites, and teamsDesign and build stable automation for new firmware features and hardware, held to production-quality engineering standardsBuild and operate HIL test infrastructure: bench and rack fixtures, device farms, power/reset control, instrument integration, and CI orchestration on real photonic hardwareDefine test strategy, plans, and reporting;
lead test plan reviews across teamsIntegrate firmware testing into CI/CD so every change is built, flashed,



exercised on hardware, and reported automaticallyOwn framework reliability and flaky test metrics as first-class engineering problemsBuild results, telemetry, and log pipelines for triage, trend analysis, and release decisionsDebug failures across the full stack (firmware, board, instrument, fixture, test code) and partner with engineers to resolve themParticipate in firmware design reviews to influence testability and diagnostics earlyIntegrate with data center management interfaces (CMIS, OpenBMC, DMTF);
debug embedded systems using GDB, JTAG, and logic analyzersDefine diagnostics and monitoring architecture for photonic transceiversMentor engineers on test architecture and write clear documentation for non-specialistsQualifications8+ years of professional software development, primarily on embedded products, including designing test frameworks and infrastructureBS or MS in Computer Science, Electrical Engineering, or equivalent experienceAt least one automation framework or HIL system architected and built from scratch, adopted by other engineers, and in daily use and the ability to discuss its design, tradeoffs, and lessons learnedStrong Python: fixture and abstraction layers, hardware drivers, plugin/configuration architecturesWorking fluency in embedded C/C++: able to read firmware drivers or state machines and write tests for edge casesExperience owning CI/CD pipelines running tests on physical hardware (GitHub Actions,



GitLab CI, Jenkins, or equivalent), including runner health, hardware allocation, and recoveryTrack record of delivering robust automation under fast-changing requirements and hardwarePreferred QualificationsPhD, or MS with 8+ years in embedded test automation or firmware developmentExperience testing firmware for optical transceivers, photonic systems, or precision analog/mixed-signal hardwareFamiliarity with CMIS, OpenBMC, or DMTF/RedfishExperience with Pytest ecosystem and test tooling for Zephyr or FreeRTOS (Twister, ztest, Renode, QEMU, or similar)Experience with optical and electrical test and measurement equipmentStartup experienceThoughtful use of AI-assisted tools in test generation, triage, or analyticsRetirement Savings Matching ProgramLife Insurance (Basic, Voluntary & AD&D;)Generous Time Off (Vacation, Sick & Public Holidays)Paid Family LeaveShort Term & Long Term DisabilityTraining & DevelopmentFlexible, hybrid workplace modelEquity grants (applicable to full-time employees)Benefits eligibility may vary depending on your employment status and location. Lightmatter recruits, employs, trains, compensates, and promotes regardless of race, religion, color, national origin, sex, disability, age, veteran status, and other protected status as required by applicable law.Export ControlCandidates should have capacity to comply with the federally mandated requirements of U.S. export control laws.Lightmatter follows a hybrid work modelLightmatter observes a hybrid work model for positions based in one of our office locations.Voluntary Self-Identification
As set forth in Lightmatter’s Equal Employment Chance policy,we do not discriminate on the basis of any protected group status under any applicable law.
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📌 Sr Sdet– Firmware Automation (Winnipeg)
🏢 Lightmatter
📍 Winnipeg