Sr. Staff Thermo-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.
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!
In this role, you will work on leading-edge packaging technologies to enable AI architectures that will set new industry standards regarding compute power, performance, and efficiency.
You will collaborate with the packaging team to carry out the required structural analysis for packaging technologies under consideration, identify key failure modes under product use conditions, and run appropriate parametric studies to influence product and package design upstream. You will focus on thermo-mechanical analysis and characterization of advanced photonics packaging technologies, including 3D stack development, heterogeneous integration of lasers and novel fiber attach methods, to define design, material, and process solutions that successfully meet assembly and reliability requirements. The results of your work will lead to advanced package designs that meet power dissipation, optical, assembly, and reliability requirements while delivering a system-level solution for leading-edge products in the AI market.
Responsibilities:
- Serve as the technical authority for thermo-mechanical simulation within the packaging organization, setting standards for model fidelity, validation methodology, and documentation practices adopted across the team.
- Identify capability gaps in simulation tooling, characterization methods, or material databases and champion fundamental investigations that strengthen the team's long-term technical foundation.
- Develop finite element stress, warpage, and assembly process models for wafer-level and unit-level photonic packaging, identifying design, process, and material parameters to mitigate failure modes and optimize yield.
- Perform analysis to identify key reliability risks under product use conditions and drive appropriate design and material solutions to improve product mechanical integrity.
- Conduct multi-physics simulations including solder collapse modeling for bump architecture definition and thermal-structural analysis for packaging stress to meet thermal, electrical, and optical requirements.
- Develop analytical or semi-empirical models for quick turn assessments for new product concepts.
- Drive characterization and validation of mechanical designs and electronic assemblies through lab-scale prototyping and vendor-initiated experiments, closing the loop between simulation predictions and physical hardware.
- Develop Python and MATLAB automation frameworks to scale simulation throughput and establish repeatable, high-efficiency modeling workflows.
- Summarize and communicate findings and recommendations with authority to key stakeholders across Lightmatter, suppliers, and customers.
- Write reports and document methodologies that serve as the technical foundation for the packaging team.
Required Qualifications:
- MS or PhD in Mechanical Engineering, Material Science, or a related engineering field.
- Deep expertise in finite element analysis using commercial tools such as Ansys, Abaqus, or equivalent, with demonstrated ability to develop and validate models for complex multi-material assemblies.
- Hands-on experience with multi-physics simulation including thermal-structural coupling, solder joint fatigue modeling, and warpage analysis.
- Strong understanding of semiconductor packaging failure modes including solder fatigue, delamination, CTE mismatch-driven stress, and underfill cracking under thermal cycling conditions.
- Experience with wafer-level and unit-level assembly processes including flip-chip, BGA, and advanced 3D packaging architectures.
- Proficiency in Python and/or MATLAB for simulation automation, data analysis, and scripting.
- Demonstrated ability to develop analytical or semi-empirical models for first-order engineering assessments.
- Experience driving characterization and validation programs through internal prototyping and external vendor collaboration.
Preferred Qualifications:
- Proven track record of communicating complex technical findings to cross-functional audiences including design, process, and product engineering teams.
- Strong technical writing skills with experience producing simulation reports, design guidelines, and methodology documentation.
- Experience with photonic packaging technologies including silicon photonics, co-packaged optics, fiber attach, or heterogeneous integration of laser devices.
- Familiarity with optical packaging reliability requirements and the intersection of thermo-mechanical performance with optical alignment stability.
- Ability to work independently and manage multiple projects with minimal supervision.
- Experience with statistical analysis tools and techniques such as DOE and JMP.
- Strong creative thinking skills with the ability to solve problems quickly.
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
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)
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.
Lead Package Assembly Integrator
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.
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)
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.
Chip Firmware Validation 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.
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!
We are hiring a Chip Firmware Validation Engineer to help us build the next generation of photonic AI processors and interconnects.
In this role, you will be responsible for developing and validating the device software and firmware stack for Photonic Compute and Photonic Interconnect products. You will collaborate with other software and hardware systems teams to develop firmware, conduct validation and reliability testing, perform data analysis, and execute further software stack optimization.
Join a tight-knit team where each individual’s contributions directly impact the success of the company and our innovative products. At Lightmatter, you’ll have the opportunity to work with people who love to build and who thrive in technically diverse environments where great ideas are valued and prioritized.
Responsibilities
- Collaborate across a multidisciplinary team including photonics, analog, digital, systems, and network experts to define the control architecture for Lightmatter's photonic interconnect products.
- Drive the software and firmware validation testing for our photonic products.
- Debug and troubleshoot embedded systems using tools such as GDB, JTAG, and logic analyzers.
- Participate in defining product architecture and validation test plans definition to gather requirements and usability criteria.
Qualifications
- BS in Electrical Engineering, Computer Science, or a related field with 5+ years of experience in ASIC firmware validation.
- Strong understanding of hardware-software integration.
- Practical knowledge of communication and control in embedded systems, peripherals, and buses.
- Experience in embedded software development.
- Experience developing commercial or enterprise-level software and firmware on Linux.
- Experience with Git and CMake for building and managing software projects.
- Hands-on experience with data gathering, analysis, and reporting.
- Proficiency with Python, C, C++ and MongoDB.
Preferred Qualifications:
- Experience with Snowflake reporting software
- Experience with environments such as CMIS and OpenBMC, and familiarity with validation and reliability/FIT(Failure in Time) testing.
- Familiarity with optical test, measurement and methodologies for characterizing optical components and systems.
- Experience developing firmware for photonic transceivers or similar systems.
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
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)
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.
Electrical Design 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.
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!
About this Role
In this role, you will contribute to the development of board and system solutions that leverage Lightmatter's technology to enable advanced machine learning, artificial intelligence, and large-scale interconnect platforms. You will collaborate closely with teams across hardware and software to design, bring up, and validate system-level products.
Responsibilities
- Design and develop power, control, mixed-signal, and high-speed interconnect circuits to meet system requirements
- Apply SI/PI, DfX, and industry best practices to meet performance and quality needs
- Perform board bring-up, verification, integration, and troubleshooting
- Develop and execute test plans to characterize and validate board and system performance
- Collaborate with cross-functional teams from concept design through integration and production
- Work with component vendors, contract manufacturers, and other partners
- Research new components, processes, and technologies to meet product goals
- Contribute to design reviews and maintain documentation including design notes, test reports, and specifications
Qualifications
- Bachelor's Degree in Electrical Engineering and 5+ years of related experience; or Master's Degree with 3+ years of related experience
- Proficient in schematic design using Altium or equivalent (Altium preferred)
- Experience performing lab experiments, board bring-up, tests, and analysis
- Familiarity with Product Lifecycle Management processes and tools (Arena preferred)
Preferred Qualifications
- Familiarity with electrical systems in the networking or similar industries
- Experience with common design, manufacturing, and test processes
- Experience with cross-functional development and troubleshooting
- Familiarity with signal integrity (SI), power integrity (PI), and DfX considerations
- Experience with high-speed interfaces such as PCIe, DDR, Ethernet, or SerDes
- Experience with Python or scripting languages for test automation and lab tooling
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
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)
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.
Staff Photonics Design 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.
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!
We are hiring a Photonics Design Engineer to join our development team. In this role, you will design, layout, and test silicon photonics devices for an integrated and scalable laser system.You will collaborate closely with cross-functional teams including photonics, packaging, systems, and software to define and refine specifications, ensuring that all designs meet or exceed performance targets and align with product requirements.
Join a tight-knit team where each individual’s contributions directly influence the success of the company and product. You'll have the opportunity to build innovative laser solutions from the ground up and tackle groundbreaking challenges. Work with people who love to build and who thrive in diverse technical environments where great ideas are prioritized.
Key Responsibilities:
- Design and optimize silicon photonic devices for laser systems, including couplers, muxes, rings, switches, and other active and passive components.
- Layout device test structures as well as complex integrated photonic systems.
- Work with the characterization team to develop and execute test plans for device validation, analyzing results to assess performance and troubleshoot issues.
- Work closely with packaging and systems engineering teams to address integration challenges, ensuring high alignment between device and system requirements.
- Implement rigorous simulation, modeling, and testing methodologies to calibrate designs and optimize performance across manufacturing variability.
- Engage in problem solving and contribute to new device designs and architectures.
- Publish novel photonics results, and participate in premier optics/photonics conferences.
Required Qualifications:
- PhD in Electrical Engineering, Physics, Photonics, or related discipline with 3 years of industry experience
- Experience in silicon photonics device design, layout, and testing, ideally in a product development environment
- Demonstrated track record of designing integrated silicon photonics components using Lumerical, Tidy3D, or equivalent
- Proficiency in modeling and data analysis in Python
- Experience with integrated lasers, SOAs
- Excellent communication skills, with a demonstrated ability to collaborate effectively with multidisciplinary teams
- Demonstrate strong problem solving skills in problems that do not have obvious solutions
- Can-do, positive attitude
Preferred Qualifications:
- Experience doing layout with foundry PDKs
- Experience with code-based GDS creation such as GDS Factory or similar
- Experience with optical and electronic test equipment, wafer-level testing and statistical data analysis (e.g., optical spectrum analyzers, tunable lasers, OBR/OVA, oscilloscopes, BERT).
- Strong project execution skills, with the ability to handle multiple priorities and meet project milestones.
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
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)
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.
Staff/Sr Staff Technical Program Manager, Hardware Systems
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!
We are hiring a Sr Technical Program Manager (TPM) to drive program execution across Lightmatter's Hardware Systems team. You will drive schedules, resource planning, priorities, and cross-functional alignment for all projects and activities within the team - spanning electrical, mechanical, and system engineering.. You will work closely with internal teams such as SI, PI, SW, supply chain, and with external partners, including contract manufacturers, PCB and sheet metal fabricators, assembly houses, and other suppliers, to keep programs on track from early design through production.
In this role, you will manage dependencies and trade-offs across concurrent workstreams, facilitate alignment across internal and external stakeholders, and maintain program visibility for engineering leadership. Your scope covers the full hardware development lifecycle, from design through production, including the engineering support programs, test infrastructure, and tooling that keep the broader team moving. You will also serve as the team's primary program interface to broader organizational programs, ensuring that schedule changes, material commitments, and engineering status are communicated accurately and on time to cross-functional program stakeholders.
This is a hands-on role that combines strong program management fundamentals with a working knowledge of hardware engineering. You will be equally at home in a design review, a supplier call, a resource planning discussion, and an executive status update. You will also need to thrive in a fast-moving environment where requirements evolve, priorities shift, and not every process is fully established, and bring the clarity and structure that turns that ambiguity into forward progress.
Responsibilities
- Own program coordination across all HW Systems activities: maintain an integrated schedule across all concurrent projects and workstreams, surface priority conflicts, and drive resolution of resource contention with engineering leads.
- Drive cross-functional alignment between HW Systems and other teams: setting agendas, facilitating meetings, capturing decisions, communicating delays and risks, and relentlessly following up on action items
- Manage team-wide resource loading and capacity visibility, partnering with engineering leads to flag overallocation risks and drive trade-offs discussions across concurrent programs
- Build and maintain integrated program schedules that reflect hardware development realities - bring-up milestones, NPI phases, EVT/DVT/PVT gates, and cross-team dependencies
- Own program scope that lives outside formal project charters: tester boards, demos, lab fixtures, calibration equipment, and internal engineering tools that teams depend on but that would otherwise lack dedicated ownership
- Coordinate material flow within the HW Systems team: track component orders, PCB fab runs, PCBA and mechanical assemblies, and engineering samples; partner with supply chain to ensure critical materials land on schedule
- Track and coordinate cross-functional teams' HW deliverable dependencies including quantities and timelines, and ensure downstream teams are unblocked with accurate, up-to-date visibility into HW schedule and status
- Serve as the primary hardware program interface with external contract manufacturers, PCB and sheet metal fabricators, and assembly houses: managing schedules, tracking deliverables, facilitating technical alignment, and driving closure on open issues in partnership with Supply chain.
- Represent the HW Systems team in company-wide program reviews and cross-functional planning cadences; own the team's program interface to broader organizational stakeholders, communicating schedule changes, material needs, and engineering commitments proactively and clearly
- Track HW Systems budgets for engineering activities, prototype builds, and tooling; coordinate with finance and operations to ensure spend is planned, visible, and aligned with program milestones
- Adapt quickly to change: replan and realign when scope shifts, schedules move, or engineering realities force a pivot; maintain momentum and clarity even when the path forward is not fully defined
- Establish and maintain lightweight program management processes: status reporting cadences, risk registers, dependency tracking, and decision logs
Qualifications
- Bachelor’s degree in Engineering or a related technical field.
- 5+ years of program management experience in hardware engineering, with direct exposure to electrical and mechanical development cycles.
- Proven track record managing concurrent engineering programs with shared resources and overlapping timelines.
- Deep familiarity with hardware development processes and terminology across the full lifecycle—including PCBA and mechanical enclosures, PCB fabrication, system integration, bring-up, EVT/DVT/PVT, and production—enabling clear communication with engineers and vendors.
- Proven experience coordinating with contract manufacturers (CMs) and ODMs to manage schedules, track deliverables, and resolve open issues.
- Hands-on experience with material flow, component tracking, and BOM management.
- Skilled facilitator who drives productive meetings, captures critical context, and ensures action items are owned and closed.
- Strong written and verbal communicator, comfortable presenting program status and risk assessments to engineering leads and executives.
- Expert in project management tools such as Microsoft Project, Jira, Smartsheet, or equivalent platforms.
- Strong bias for action—consistently closes loops, follows up independently, and identifies potential slips before they impact project timelines.
- Thrives in fast-paced, ambiguous environments; proactively creates structure and drives clarity without waiting for complete information.
Preferred Qualifications
- Experience managing programs for complex hardware development
- Experience defining and improving program management processes in a startup or new business unit
This role is open to two different levels.
Staff: $189,000 - $210,000
Sr Staff: $217,000 - $252,000
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
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)
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.
Staff/Sr Staff Technical Program Manager, Hardware Systems
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!
We are hiring a Sr Technical Program Manager (TPM) to drive program execution across Lightmatter's Hardware Systems team. You will drive schedules, resource planning, priorities, and cross-functional alignment for all projects and activities within the team - spanning electrical, mechanical, and system engineering.. You will work closely with internal teams such as SI, PI, SW, supply chain, and with external partners, including contract manufacturers, PCB and sheet metal fabricators, assembly houses, and other suppliers, to keep programs on track from early design through production.
In this role, you will manage dependencies and trade-offs across concurrent workstreams, facilitate alignment across internal and external stakeholders, and maintain program visibility for engineering leadership. Your scope covers the full hardware development lifecycle, from design through production, including the engineering support programs, test infrastructure, and tooling that keep the broader team moving. You will also serve as the team's primary program interface to broader organizational programs, ensuring that schedule changes, material commitments, and engineering status are communicated accurately and on time to cross-functional program stakeholders.
This is a hands-on role that combines strong program management fundamentals with a working knowledge of hardware engineering. You will be equally at home in a design review, a supplier call, a resource planning discussion, and an executive status update. You will also need to thrive in a fast-moving environment where requirements evolve, priorities shift, and not every process is fully established, and bring the clarity and structure that turns that ambiguity into forward progress.
Responsibilities
- Own program coordination across all HW Systems activities: maintain an integrated schedule across all concurrent projects and workstreams, surface priority conflicts, and drive resolution of resource contention with engineering leads.
- Drive cross-functional alignment between HW Systems and other teams: setting agendas, facilitating meetings, capturing decisions, communicating delays and risks, and relentlessly following up on action items
- Manage team-wide resource loading and capacity visibility, partnering with engineering leads to flag overallocation risks and drive trade-offs discussions across concurrent programs
- Build and maintain integrated program schedules that reflect hardware development realities - bring-up milestones, NPI phases, EVT/DVT/PVT gates, and cross-team dependencies
- Own program scope that lives outside formal project charters: tester boards, demos, lab fixtures, calibration equipment, and internal engineering tools that teams depend on but that would otherwise lack dedicated ownership
- Coordinate material flow within the HW Systems team: track component orders, PCB fab runs, PCBA and mechanical assemblies, and engineering samples; partner with supply chain to ensure critical materials land on schedule
- Track and coordinate cross-functional teams' HW deliverable dependencies including quantities and timelines, and ensure downstream teams are unblocked with accurate, up-to-date visibility into HW schedule and status
- Serve as the primary hardware program interface with external contract manufacturers, PCB and sheet metal fabricators, and assembly houses: managing schedules, tracking deliverables, facilitating technical alignment, and driving closure on open issues in partnership with Supply chain.
- Represent the HW Systems team in company-wide program reviews and cross-functional planning cadences; own the team's program interface to broader organizational stakeholders, communicating schedule changes, material needs, and engineering commitments proactively and clearly
- Track HW Systems budgets for engineering activities, prototype builds, and tooling; coordinate with finance and operations to ensure spend is planned, visible, and aligned with program milestones
- Adapt quickly to change: replan and realign when scope shifts, schedules move, or engineering realities force a pivot; maintain momentum and clarity even when the path forward is not fully defined
- Establish and maintain lightweight program management processes: status reporting cadences, risk registers, dependency tracking, and decision logs
Qualifications
- Bachelor’s degree in Engineering or a related technical field.
- 5+ years of program management experience in hardware engineering, with direct exposure to electrical and mechanical development cycles.
- Proven track record managing concurrent engineering programs with shared resources and overlapping timelines.
- Deep familiarity with hardware development processes and terminology across the full lifecycle—including PCBA and mechanical enclosures, PCB fabrication, system integration, bring-up, EVT/DVT/PVT, and production—enabling clear communication with engineers and vendors.
- Proven experience coordinating with contract manufacturers (CMs) and ODMs to manage schedules, track deliverables, and resolve open issues.
- Hands-on experience with material flow, component tracking, and BOM management.
- Skilled facilitator who drives productive meetings, captures critical context, and ensures action items are owned and closed.
- Strong written and verbal communicator, comfortable presenting program status and risk assessments to engineering leads and executives.
- Expert in project management tools such as Microsoft Project, Jira, Smartsheet, or equivalent platforms.
- Strong bias for action—consistently closes loops, follows up independently, and identifies potential slips before they impact project timelines.
- Thrives in fast-paced, ambiguous environments; proactively creates structure and drives clarity without waiting for complete information.
Preferred Qualifications
- Experience managing programs for complex hardware development
- Experience defining and improving program management processes in a startup or new business unit
This role is open to two different levels.
Staff: $171,000 - $200,000
Sr Staff: $203,000 - $243,000
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
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)
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.
Reliability Engineer (Hardware)
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!
In this role you will be responsible for designing, executing, and analyzing reliability tests to verify product performance, durability, and compliance with standards. You will enable our products to meet or exceed reliability requirements throughout their lifecycle by developing robust test protocols, analyzing failures, and working with cross-functional teams to drive improvements in design and manufacturing processes.
Responsibilities
- Develop reliability test plans based on product requirements, industry standards, and customer expectations.
- Execute reliability qualification testing for our highly integrated photonics-based AI platform and our photonics chiplet communication fabric products.
- Conduct Failure Modes and Effects Analysis (FMEA) to identify and mitigate potential reliability risks in device design and manufacturing.
- Perform detailed root cause analysis of device failures, and collaborate with cross-functional teams to resolve reliability issues, refine product designs, and improve process robustness.
- Establish internal reliability guidelines and standards to meet customer requirements and industry benchmarks.
- Utilize statistical analysis tools to model reliability performance and predict device lifetimes under field conditions.
- Prepare and present detailed technical reports, including reliability test plans, results, and risk assessments, to internal and external stakeholders.
Qualifications
- Bachelor's degree in Electrical Engineering, Computer Engineering or a similar field
- 5+ years of industry experience working as a Reliability Engineer within the semiconductor and/or photonics industry.
- Understanding of device and package reliability testing methodologies, including HTOL, HAST, TDDB, HTHH, TC etc.
- Hands-on experience with failure analysis tools and techniques such as SEM, TEM, FIB, and EMMI etc.
- Knowledge of device physics, reliability and failure mechanism in Serdes/digital/mixed signal IC’s.
- Good understanding of packaging failure mechanisms and risks on TSV, solder joints, warpage, metal migrations etc.
- Familiarity with reliability modeling tools and statistical analysis (e.g., Weibull analysis, Minitab, JMP).
Preferred Qualification:
- Preferably experienced in semiconductor or photonics device/module testing.
- Experience with advanced packaging technologies such as flip-chip, wafer-level packaging, or 3D integration.
- Good statistical data analysis skills to analyze pre vs post reliability data.
- Excellent communication and presentation skills, with the ability to convey complex reliability concepts to diverse audiences.
- PhD in Electrical Engineering, Computer Engineering or a similar field , working as a Reliability Engineer for at least 1 year
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
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)
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.
Staff Photonics Design and Layout 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.
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!
About this Role
We are hiring a Staff Photonics Design and Layout Engineer to join our rapidly growing team. In this role, you will be working closely with photonics, product, architecture, analog, digital and packaging teams to floorplan, design and layout block- and chip-scale photonic circuits. You will be tasked with supporting photonic products throughout their entire development cycle, from a clean sheet concept all the way to the tapeout and bring-up. Leveraging our industry-leading and proprietary photonics integration and verification flow and tools, you will be working on verifying that all blocks and circuits meet their performance design targets.
Join a tight-knit team where each individual’s contributions directly influence the success of the company and product. You'll have the opportunity to build innovative integrated photonic solutions from the ground up and tackle groundbreaking challenges. Work with people who love to build and who thrive in diverse technical environments where great ideas are prioritized.
Responsibilities
- Understand product requirements and work with customer-facing teams to help identify optimal photonics solutions
- Work on clean sheet design and layout of block- and system-level photonic circuits
- Work with analog, digital and packaging teams to ensure seamless integration of on-chip photonics with other subsystems
- Perform rigorous layout-driven photonic simulation and verification. Identify performance bottlenecks and troubleshoot issues.
- Help develop and improve photonic layout, verification and integration flows for multiple photonic processes and foundries
- Contribute to proprietary PDK development
- Engage in problem solving and contribute to new photonic chip designs and architectures.
- Publish novel results, and participate in premier optics/photonics conferences.
Qualifications
- MS + 10 years or PhD + 3 years of industry experience in Electrical Engineering, Physics, Photonics, or related discipline
- Excellent understanding of fundamental concepts of silicon photonics
- Familiarity with of a wide variety of silicon photonics devices, knowledge of their performance metrics and design trade-offs
- Proficiency with Python
- Experience with script-based photonic circuit design and layout using GDSFactory or similar
- Demonstrated track record of multiple photonic tapeouts
- Excellent communication skills, with demonstrated ability to collaborate effectively with multidisciplinary teams
- Demonstrated ability to independently work on both highly constrained and loosely defined problems
Preferred Qualifications
- Experience with product-grade photonic tapeouts
- Experience with foundry and custom PDKs
- Experience with photonic and/or analog circuit design in Cadence Virtuoso
- Strong project execution skills, with the ability to handle multiple priorities and meet project milestones.
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
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)
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.
Senior Technical Program Manager
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!
About the job
We are hiring a Senior Technical Program Manager to help coordinate the engineering effort behind Lightmatter’s AI and Chiplet Interconnect products. You will lead program management for Lightmatter’s silicon hardware engineering team from design through production, collaborating with engineering teams across the company to plan and drive the team's objectives. This role will span silicon development, packaging, assembly, and test phases.
In this role, you will collaborate constantly with engineering teams across the company to plan and drive objectives for the group. You will gather requirements, drive quality initiatives, manage technical risks, and plan for all phases of the silicon design process. In addition, you’ll partner with executives and engineering leadership to develop and manage milestones and schedules for the many moving parts that need to come together.
Responsibilities
- Organize and expertly drive planning, scheduling, and day-to-day execution to support Lightmatter’s silicon, package and systems development
- Collaborate with leads and engineering teams in effectively estimating and prioritizing tasks in order to maintain excellent quality on a realistic delivery schedule
- Develop and lead project plans (scope, schedule, and budget) to ensure alignment with key partners and business needs
- Manage project schedules and quality, identify possible issues and risks, and clearly communicate them to project stakeholders
- Facilitate recurring project meetings and operational checkpoint activities throughout the life cycle of projects
- Set clear and targeted communication to management of project information, including project plan, key dates, and project status
- Provide the required hands-on project management, cross-functional coordination, and internal and external team communications to deliver outstanding program outcomes
- Take responsibility for release schedules and milestones in a fast-paced environment
- Opportunities to engage with vendors and customers in external program
Qualifications
- 8+ years of experience with silicon design and tapeout, and product qualification
- Bachelor’s degree in a technical field
- Experience with product qualification lifecycle (EVT, DVT, PVT)
- Prior semiconductor engineering experience (chip, systems, or product)
- Experience influencing decisions and leading teams in a matrix environment
- Attention to detail and strong ability to multitask in an ever-changing fast-paced environment
- Proven ability to identify and implement process improvements, characterized by a high level of responsiveness and passion for enhancing operational efficiency
- Expert user of program management tools such as MS-Project, Asana, Smartsheet, or similar
- Excellent communications and technical presentation skills
Preferred Qualifications
- Knowledge of photonic structures, optical communication, and laser solutions
- Experience setting up project management initiatives from scratch in either a startup or a new business unit environment
We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.
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)
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.
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