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Salary: USD 139,000 - 0 / annual
Lightmatter is seeking a System Mechanical Design Engineer to develop chassis and rack platforms for next-generation AI servers. The company has invented Passage™, a 3D-stacked photonics engine that connects thousands to millions of processors at the speed of light for extreme-scale data centers. Recently raised $400M in Series D at $4.4B valuation.
In this role, you will sit at the intersection of silicon photonics, advanced 3D packaging, and extreme-density thermal management. You will transform complex electro-optical concepts into scalable, manufacturable hardware through rigorous technical execution. This is a hands-on position focused on practical engineering rather than high-level architecture.
Key responsibilities include: designing, testing, analyzing, and qualifying hardware of moderate to high complexity; ensuring optimal thermal performance through proper packaging of optical and electrical components; generating CAD drawings, BOMs, and work instructions; managing design reviews and change requests; collaborating on root-cause analysis with cross-functional teams; driving prototype fabrication and leading external contract manufacturers for production scaling; managing fabricators for build-to-print quality; coordinating with technical program managers on timelines; mitigating supply chain lead-time issues; and contributing to technical roadmaps and feasibility assessments.
Required qualifications: Bachelor's in Mechanical Engineering or related field; 5+ years of system mechanical design experience with multiple successful product releases; proficiency in 3D CAD (SolidWorks); familiarity with thermal and structural testing/analysis; experience with mechanical engineering tools (ANSYS preferred); strong understanding of heat transfer, strength of materials, materials selection, and vibration design; electronics packaging industry experience; strong communication skills.
Preferred: Master's degree; 3D printing experience; FEA software proficiency; thermal simulation software expertise (IcePak, Flotherm). The role is open at two levels; seniority and compensation depend on education, experience, and interview performance.
