Principal Mechanical Engineer

The role

This person will lead the architecture, design, development, and industrialization of next-generation high-speed optical transceiver modules. They will work cross-functionally to deliver high-performance products at hyperscale production volumes.

What you will do

• Lead end-to-end mechanical design and development of OSFP transceiver modules and related hardware
• Define module architecture, stack-up strategy, mechanical interfaces, retention mechanisms, heat spreaders, cages, and thermal paths
• Design precision components using sheet metal, die castings, injection molded plastics, CNC machined parts, and TIMs
• Optimize designs for thermal performance, structural integrity, EMI shielding effectiveness, manufacturability, reliability, and cost
• Drive advanced thermal solutions for high-power DSP and optical engines
• Develop cooling strategies involving heat sinks, vapor chambers, heat spreaders, liquid cooling interfaces, and advanced TIM selection
• Lead reliability validation including thermal cycling, mechanical shock/drop, vibration, HALT/HASS, and environmental testing
• Define GD&T strategy and tolerance stack-up analysis for critical thermal and optical interfaces
• Design EMI shielding solutions including conductive gaskets, coatings, and grounding strategies
• Drive NPI activities from concept through mass production

Required qualifications

• Bachelor’s or Master’s degree in Mechanical Engineering or related field
• 12–20+ years of experience in optical transceivers, networking systems, semiconductor packaging, or data center hardware
• Strong expertise in OSFP/QSFP mechanical systems, thermal management, and precision design
• Proficiency in Creo, SolidWorks, or NX CAD tools
• Strong understanding of GD&T, tolerance analysis, material science, EMI/EMC, and reliability engineering

Nice to have

• Experience with 800G/1.6T optical modules
• Knowledge of co-packaged optics or near-packaged optics
• Experience with copper alloys, Zamak die casting, advanced TIMs, and thermal materials
• Familiarity with OSFP MSA specifications and high-volume manufacturing models
• Six Sigma certification or patent publications

Benefits

• Competitive salary
• Significant equity in a high-growth company
• Comprehensive health, dental, and vision insurance
• Flexible time off policy

About the company

Lumilens is building the critical photonics infrastructure that powers tomorrow’s AI supercomputing. They are unlocking a new era of computing through chip-to-chip optical interconnects and scalable photonic engines.