Sr SDET– Firmware Automation
Lightmatter · Boston, MA; Mountain View, CA
About this role
**Sr SDET – Firmware Automation (Lightmatter)** Lightmatter is leading the revolution in AI data center infrastructure, enabling next-generation 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 for extreme-scale AI and HPC workloads. 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 (HIL) infrastructure that let firmware engineers test their own code continuously on real photonic hardware. You’ll work closely with the firmware team, spend time at the bench with oscilloscopes and optical instruments, and act as the bridge between firmware and broader software and systems organizations. **Responsibilities** - Own the architecture and roadmap of the firmware test automation framework across products, targets, sites, and teams - Design and build stable automation for new firmware features and hardware to production-quality engineering standards - Build and operate HIL test infrastructure: bench and rack fixtures, device farms, power/reset control, instrument integration, and CI orchestration on real photonic hardware - Define test strategy, plans, and reporting; lead test plan reviews across teams - Integrate firmware testing into CI/CD so every change is built, flashed, exercised on hardware, and reported automatically - Own framework reliability and flaky test metrics as first-class engineering problems - Build results, telemetry, and log pipelines for triage, trend analysis, and release decisions - Debug failures across the full stack (firmware, board, instrument, fixture, test code) and partner with engineers to resolve them - Participate in firmware design reviews to influence testability and diagnostics early - Integrate with data center management interfaces (CMIS, OpenBMC, DMTF); debug embedded systems using GDB, JTAG, and logic analyzers - Define diagnostics and monitoring architecture for photonic transceivers - Mentor engineers on test architecture and write clear documentation for non-specialists **Qualifications** - 8+ years of professional software development, primarily on embedded products, including designing test frameworks and infrastructure - BS or MS in Computer Science, Electrical Engineering, or equivalent experience - At least one automation framework or HIL system architected and built from scratch, adopted by other engineers, and in daily use—able to discuss design, tradeoffs, and lessons learned - Strong **Python** (fixture/abstraction layers, hardware drivers, plugin/configuration architectures) - Working fluency in **embedded C/C++** (read firmware drivers/state machines; write tests for edge cases) - Experience owning **CI/CD** pipelines running tests on physical hardware (GitHub Actions, GitLab CI, Jenkins, or equivalent), including runner health, hardware allocation, and recovery - Track record of delivering robust automation under fast-changing requirements and hardware **Preferred Qualifications** - PhD, or MS with 8+ years in embedded test automation or firmware development - Experience testing firmware for optical transceivers, photonic systems, or precision analog/mixed-signal hardware - Familiarity with CMIS, OpenBMC, or DMTF/Redfish - Experience with Pytest ecosystem and test tooling for Zephyr or FreeRTOS (Twister, ztest, Renode, QEMU, or simi
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