Mechanical Engineer

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.

In this role you will be part of the Packaging Analysis team, working on leading‑edge packaging technologies to enable AI architectures that set new industry standards for compute power, performance, and efficiency. You will perform mechanical design and structural analysis for emerging packaging technologies, identify key failure modes under product use conditions, and run parametric design studies to influence upstream product and package design.

• Create mechanical models of package stack‑up and associated components.
• Perform mechanical design analysis to identify and implement solutions that improve package mechanical integrity.
• Execute geometric tolerance analysis and create GD&T drawings and CAD models.
• Conduct finite element analysis to highlight key design, assembly, and reliability trade‑offs.
• Apply manufacturing expertise to influence design choices, perform FMEAs, and evaluate the cost implications of process and design decisions.
• Collaborate with package and systems teams to ensure packaging solutions comply with system boundary conditions.
• Generate modeling and simulation reports.

• BS, MS or PhD in Mechanical Engineering or a related field.
• Minimum of 5 years of experience in mechanical design and finite element analysis.
• Experience in CAD tools such as Solidworks or AutoCAD, with a focus on mechanical design best practices.
• Expertise in Geometric Dimensioning and Tolerancing (GD&T) and tolerance stack‑up analysis.
• Hands‑on experience with FEA solvers such as ABAQUS or ANSYS.
• Working knowledge of semiconductor packaging technologies, including the mechanical and thermal trade‑offs of 3D, 2.5D, and FCBGA architectures.

• Knowledge of ASME Y14.5 standards.
• Excellent communication skills and ability to work well in cross‑functional teams.
• Ability to drive results independently and with minimal supervision.
• Creative problem‑solving skills with a focus on rapid solution implementation.

Salary Range:
Total compensation goes beyond base salary and also includes a new‑hire equity grant, annual performance‑based equity, and other rewards that recognize your impact and contribution. Base salary range: $135,000 USD – $212,000 USD.

• 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)

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.

Candidates should have capacity to comply with the federally mandated requirements of U.S. export control laws.