Silicon Packaging Engineer - Intern & New Grad

Lightmatter is developing photonic engines and AI data center infrastructure for large-scale computing. The Silicon Packaging Engineer role supports co-packaged optics from concept through high-volume production, contributing to signal and power integrity, thermal engineering, mechanical and thermo-mechanical design, and packaging integration.

What you'll do:

• Signal & Power Integrity — high-speed interface analysis (PCIe, UCIe, SerDes), PDN design and simulation, eye diagrams, jitter, S-parameters
• Thermal Engineering — CFD simulation, heat sink and TIM evaluation, liquid cooling, package-level thermal analysis
• Mechanical & Thermo-Mechanical Design — structural analysis, tolerance stack-up, GD&T, FEA, solder fatigue, CTE mismatch
• Packaging Integration — 2.5D/3D packaging, fiber attach, heterogeneous integration, assembly yield and reliability

What they're looking for:

• Pursuing or recently completed a BS, MS, or PhD in Electrical Engineering, Mechanical Engineering, Materials Science, or a related field
• Hands-on experience through coursework, capstone projects, research labs, or internships
• Familiarity with at least one relevant tool — SolidWorks, ANSYS, ADS, Cadence, Python, MATLAB, or similar
• Curious, collaborative, and comfortable asking questions
• Candidates should have capacity to comply with the federally mandated requirements of U.S. export control laws

Benefits:

• Comprehensive Health Care Plan (Medical, Dental & Vision)
• Retirement Savings Matching Program
• Life Insurance (Basic, Voluntary & AD&D)
• Generous Time Off (Vacation, Sick & Public Holidays)
• Paid Family Leave
• Short Term & Long Term Disability
• Training & Development
• Commuter Benefits
• Flexible, hybrid workplace model
• Equity grants (applicable to full-time employees)