Principal Mechanical Engineer

Principal Mechanical Engineer – OSFP Module Design

About Lumilens

At Lumilens, we are building the critical photonics infrastructure that powers tomorrow’s AI supercomputing. From chip-to-chip optical interconnects to scalable photonic engines, Lumilens is unlocking a new era of computing—faster, cooler, and massively more efficient. Join our experienced team to help shape the next generation of high-speed optical connectivity.

Position Summary

We are seeking an experienced Principal Mechanical Engineer to lead the architecture, design, development, and industrialization of next-generation high-speed optical transceiver modules, including 800G, 1.6T, and future pluggable platforms based on the OSFP ecosystem.

This role requires deep expertise in high-speed electro-mechanical packaging, thermal management, precision tolerance engineering, EMI/EMC compliance, materials engineering, and large-scale manufacturing/NPI execution. You will work cross-functionally with optics, signal integrity, electrical, thermal, manufacturing, reliability, and supplier teams to deliver high-performance products at hyperscale production volumes.

Key Responsibilities

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

(Optional) Perform thermal simulations using FloTHERM, Icepak, and CFD tools

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

Establish DFM/DFA guidelines, assembly processes, quality controls, and automation opportunities

Lead supplier qualification and manufacturing transfer activities

Support yield improvement and root-cause analysis using 8D, DMAIC, Fishbone, and DFMEA/PFMEA

Mentor and technically lead engineering teams

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

Preferred Qualifications

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 preferred

Key Skills

Mechanical architecture leadership

Thermal design & simulation (optional)

NPI & manufacturing transfer

Supplier management

Cost optimization / should-cost analysis

DFMEA / PFMEA

Root cause analysis

Program leadership

Executive-level technical presentation skills

Ideal Background / Industries

Optical networking

Hyperscale data centers

Semiconductor systems

Telecom infrastructure

AI server platforms

High-speed interconnect products

What We Offer

Competitive salary and significant equity in a high-growth company

Comprehensive health, dental, and vision insurance

Flexible time off policy

Direct impact on groundbreaking technology shaping the future of AI and data centers

Opportunity to work with a highly experienced and collaborative team

Dynamic and innovative work environment

Opportunity for rapid career growth

Lumilens is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, or any other protected characteristic.