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.
Lightmatter raised $400 million in its Series D round, reaching a valuation of $4.4 billion. We will continue to accelerate the development of data center photonics and grow every department at Lightmatter!
If you're passionate about tackling complex challenges, making an impact, and being an expert in your craft, join our team of brilliant scientists, engineers, and accomplished industry leaders.
Lightmatter is (re)inventing the future of computing with light!
Lead Package Assembly Integrator
In this role, you will work on leading-edge packaging technologies to enable AI architectures that set new industry standards for compute power, performance, and efficiency. As part of the Packaging Technology team, you will serve as the lead assembly process integrator. Your responsibilities will include developing assembly process technologies and generating assembly/test design rules for Heterogeneous Integrated co-packaged optics technologies by collaborating with design teams, silicon and photonics foundries, and OSAT partners. You will be responsible for developing test chip strategies, managing test chip design, and appropriately planning and managing design of experiments with partners. Additionally, you will work closely with package and system architects to incorporate manufacturability considerations into product definitions. The results of your work will lead to advanced package designs that meet assembly and reliability requirements, while delivering leading-edge products for data centers and the high-end compute segment.
Responsibilities:
- Develop end-to-end 3D package assembly, test, and fiber-attach processes for Lightmatter products, ensuring robust high yields while meeting performance and reliability goals by working closely with foundry and OSAT partners.
- Develop and execute package architectures and designs, ensuring they meet rigorous product performance standards while optimizing for manufacturability and long-term reliability.
- Define test chip requirements and manage test chip design required for 3D package process development.
- Develop and validate design rules for a high-yielding assembly process. The scope includes assembly/test, backend/RDL, silicon/package interaction, substrate, thermal/mechanical solutions, fiber attach, system integration, and other related areas.
- Plan and execute design of experiments, manage data, and perform appropriate analysis to gain insights into assembly process and design interactions.
- Perform analysis to identify key reliability risks under product use conditions and drive appropriate design and materials solutions to improve product mechanical integrity.
- Summarize and communicate to key stakeholders across Lightmatter, suppliers and customers as required.
- Write reports and document methodologies.
Required Qualifications:
- MS or PhD in Mechanical Engineering, Material Science, or related engineering field.
- Experience in wafer scale packaging assembly process development.
- Knowledge of 2D/3D packaging technologies, materials, and equipment requirements.
- Proven ability to define requirements for test chip and assembly test vehicles.
- Understanding of photonics packaging requirements including various fiber attach methods.
- Experience with advanced packaging technologies, including thermal, mechanical, and reliability factors.
Preferred Qualifications:
- Excellent communication skills, with the ability to convey complex technical concepts to both technical and non-technical stakeholders.
- Strong project ownership, with a history of driving results independently and with minimal supervision.
- Proven track record of developing creative solutions for complex technical challenges.
- Experience in thermal and mechanical modeling and coding for data analysis.
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
- 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)
Benefits eligibility may vary depending on your employment status and location. 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.
Export Control
Candidates should have capacity to comply with the federally mandated requirements of U.S. export control laws.
Skills Required
- MS or PhD in Mechanical Engineering, Material Science, or related engineering field.
- Experience in wafer scale packaging assembly process development.
- Knowledge of 2D/3D packaging technologies, materials, and equipment requirements.
- Proven ability to define requirements for test chip and assembly test vehicles.
- Understanding of photonics packaging requirements including various fiber attach methods.
- Experience with advanced packaging technologies, including thermal, mechanical, and reliability factors.
- Excellent communication skills, able to convey complex technical concepts to varied audiences.
- Strong project ownership and ability to drive results independently.
- Proven track record developing creative solutions for complex technical challenges.
- Experience in thermal and mechanical modeling and coding for data analysis.
Lightmatter Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Lightmatter and has not been reviewed or approved by Lightmatter.
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Fair & Transparent Compensation — Pay is considered competitive for specialized photonics and AI‑hardware roles, with posted ranges and third‑party totals aligning to strong market levels. Compensation for niche roles is framed as consistent with top‑tier hardware/photonics expectations.
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Healthcare Strength — Healthcare is described as comprehensive, covering medical, dental, and vision in current postings. Additional protections like life insurance and disability are also called out.
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Equity Value & Accessibility — Equity grants for full‑time employees are commonly included alongside base pay. Some postings also mention performance‑based equity components.
Lightmatter Insights
What We Do
Lightmatter is a startup photonics company that has pioneered a new paradigm in processor chip architecture that uses photons instead of electrons. Now the leader in the photonic AI compute “space race,” this new class of high performance semiconductors is the foundation of Lightmatter’s mission to enable the growth of computing, reduce harmful emissions associated with this growth, and democratize computing for all. Lightmatter's technology accelerates critical operations in deep neural networks, using an array of programmable photonic elements fabricated alongside transistors in conventional computer chip fabrication processes. Our close-knit team of engineers has created an integrated photonics chip and ultra-high performance interconnect that is faster, more efficient, and cooler than anything else on earth (or anything ever experienced before) to power the next giant leaps in human progress.
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