Lightmatter jobs

Analog Mixed Signal Architect Toronto, ON 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! As an Analog Architect, you will spearhead pathfinding efforts and work on early prototypes of innovative analog and mixed-signal solutions for Lighmatter's next-generation optical-engine products. You will then work closely with the engineering team to take your ideas to high-volume production. This role requires a deep understanding of high-frequency systems-on-chip (SoCs), high-speed (100+ Gbaud) serial and electro-optic interfaces. The role also requires creativity, analytical skills, and clear communication skills. You may represent the company at technical conferences as an example of our technical leadership. 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 a new kind of computer from the ground up and to solve groundbreaking challenges along

Principal Field Application Engineer Mountain View, CA; Remote - USA 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 now looking for an outstanding Field Application Engineer - High-speed I/O Specialist to join our team. The role's primary responsibility is to work collaboratively with customers in architecting the next generation of devices enabled by Lightmatter's photonic interconnect technology Passage. In this role, you will work closely with Tier 1 Semiconductor companies that are defining the next generation of silicon in the data center. You will be working cross functionally within Lightmatter as you define an optimal technical solution. Additionally, you will be collaborating with customers who are domain experts in high-speed serial links (SerDes) and protocols. You should be comfortable supporting deep technical discussions focused on high-speed serial I/O design. Excellent interpersonal skills and the

Staff Embedded Software Engineer Toronto, ON 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 talented software engineer to help us build the next generation of photonic AI processors and interconnects. In this role, you will be responsible for developing and extending the device software and firmware stack for Photonic Compute and Photonic interconnect products. You will collaborate with other software teams and hardware systems teams to develop security, telemetry, virtualization, and remote administration functionality. Responsibilities - Collaborate across a multidisciplinary team including Photonic, Analog, Digital, Systems and Network experts to define control plane architecture for Lightmatter's photonic interconnect products. - Define diagnostics and monitoring architecture for photonic transceivers. - Integrate with DataCenter administration capabilities using environments such as CMIS, OpenBMC and DMTF. - Debug and troubleshoot embedded systems using tools such as

Senior Technical Writer Boston, MA; Mountain View, CA; Toronto, ON 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 a small, highly technical writing team embedded in the Product org at Lightmatter. We own all customer-facing technical content for our hardware and software products - giving engineers and researchers at the leading edge of AI and high-performance computing everything they need to get up and running fast. Responsibilities As a Senior Technical Writer, you will be key in defining the voice and structure of Lightmatter's customer-facing content. Your responsibilities will include: - Lead technical writing activities for critical customer-facing product content, including hardware and software documentation for silicon photonics products such as data sheets, user guides, API documentation, release notes, and product briefs. - Drive content strategy, governance, and quality standards across

Chip Architecture Leader Boston, MA; Mountain View, CA 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 Head of Chip Architecture, you will collaborate with both external partners and internal engineering teams to develop and deliver innovative, high-volume photonics products. In this role, you will define advanced chip architectures for co-packaged optics, working closely with cross-disciplinary teams to model, analyze, and optimize system performance. Success in this role requires deep domain expertise in silicon photonics, high-frequency (50+ GHz) electro-optic interfaces, lasers, optical amplifiers, fiber-optic communications, and packaging/assembly techniques. Strong analytical problem-solving, effective communication, and technical leadership are essential. You will be expected to be the primary technical liaison for key customers, partners, and internal stakeholders. You will also represent Lightmatter's at premier industry conferences. Join a tight-knit team where each individual's contributions directly

Principal Machine Learning Infrastructure Researcher Mountain View, CA 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! Lightmatter is seeking a Principal of Machine Learning Infrastructure Researcher to join our Machine Learning team. This team is focused on inventing novel hardware systems using Lightmatter technology and modeling the performance of Lightmatter-enabled systems on both training and inference workloads. This is primarily a creative role where you need to think outside the box to push the boundaries of systems research with the power of silicon photonics at your fingertips. This role will work closely with our product, solutions architecture, and engineering teams to generate impactful performance analysis, create high-performance rack-scale designs, and publish cutting-edge ML systems research. Responsibilities: - Stay up to date on the latest advancements in Machine Learning research. - Build tools to model the performance

Mixed-Signal Validation Engineer Mountain View, CA 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 Mixed-Signal Architecture Validation Engineer to partner with the internal engineering team at Lightmatter to deliver groundbreaking products to market. In this role, you will require a solid understanding of Lightmatter products, mixed-signal digital architecture, process technology, chip design, and clear communication skills. In this role, you will be validating the architecture of the mixed-signal circuits that enable a groundbreaking photonic-based communication fabric. Your work will enable not only the low-level AMS/photonic devices but also the necessary interfaces with firmware and software. You will also influence product definition and technological roadmaps, as well as suitable design and verification methodologies. You will report directly to the Head of Product Validation, but you will also work closely with our digital, analog,

Principal Product Engineer Mountain View, CA 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! The Product Engineer role is pivotal to Lightmatter's mission, sitting at the center of product delivery and operational excellence. This position offers a unique opportunity for end-to-end ownership, where you will define the product engineering landscape from the ground up and drive the strategic direction for our hardware portfolio. You will collaborate with cross-functional teams (design, foundry, packaging, test, validation, reliability) to optimize manufacturing flows, improve yield and quality, and reduce costs. The role's focus areas include: optimizing Yield & Quality, implementing DFx principles, and managing the product from initial silicon to high-volume manufacturing (HVM). The core responsibilities are specifically centered on optimizing manufacturing flows, yield Improvement, and Test Point Optimization. - Strategic Ownership: Own the product's success by managing yield and

Photonics Technical Lead Toronto, ON 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 Technical Lead to join our laser development team. In this role, you will develop integrated and highly scalable laser solutions for silicon photonics AI communications and computation. You will work closely with cross-disciplinary engineering teams both internally and across our ecosystem of manufacturing partners to assess the technical feasibility of product requirements, develop an engineering plan to meet architectural specifications, execute new product designs for laser solutions, and validate system performance on hardware. This role requires a deep understanding of complex multi-domain platforms as well as integrated silicon photonics and the requirements of datacom systems. You will navigate the design space of performance, schedule, reliability, power consumption, and cost, working in tandem with stakeholders across the company to

Staff Mechanical Engineer Boston, MA; Mountain View, CA; Toronto, ON 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 working on leading-edge packaging technologies to enable AI architectures that set new industry standards for compute power, performance, and efficiency. As a member of the Packaging Analysis team, you will perform mechanical design and structural analysis for emerging packaging technologies. You will identify key failure modes under product use conditions and run appropriate parametric design studies to influence product and package design upstream. You will be responsible for the package stack-up analysis, defining mechanical and thermal aspects that influence package form factors, and driving socket/enabling mechanisms. You will utilize Finite Element Analysis (FEA) and Geometric Dimensioning and Tolerancing (GD&T) to propose solutions that finalize the design. Your work will result in advanced

Director, NPI Operations Mountain View, CA 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 seeking a strategic and hands-on Director of NPI (New Product Introduction) Operations, who will lead the transition of our next-generation hardware products from design completion through mass production. You will serve as the strategic bridge between Engineering, Product, and the Global Supply Chain, ensuring that revolutionary technology is manufacturable, scalable, and delivered with uncompromising quality to our data center partners. Responsibilities: Product Lifecycle Leadership - Lead the cross-functional NPI Core Team to ensure Design for Manufacturing (DFM) and Design for Test (DFT) requirements, specifically related to optical assembly and hybrid integration, are integrated early in the product design phase. - Drive the Stage-Gate process from Proto to EVT (Engineering Validation), DVT (Design Validation), and PVT (Production Validation), with a focus

Photonics Test Engineer Mountain View, CA 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 You will be focused on architecting wafer, package and system level characterization and test strategies of Lightmatter's novel Silicon Photonic product line. As part of this role you will have the ability to directly influence the design and development of Lightmatter silicon photonics technologies. You will be part of a growing interdisciplinary team with a lot of opportunities to learn and make a big impact. Responsibilities - Work directly with the architecture and design teams to understand the technology and conceptualize characterization and test techniques targeting feedback for design model validations. - Architect test concepts, test platforms, design for test rules, and provide feedback early on during the technology concept phase. - Create detailed test plan documentation and ensure

Photonics Hardware Validation Engineer Mountain View, CA 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 design, develop, and build photonic test systems that are critical to the characterization and validation of our products. You will collaborate closely with device, hardware, software, and digital and analog design teams to support the end-to-end development, validation, and qualification of photonic systems and their key components. 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 thrive in technically diverse environments where great ideas are valued and prioritized. We are hiring a Photonics Hardware Validation Engineer to join our Validation team to drive photonics testing, characterization and validation of our silicon

Senior IT Support Engineer Mountain View, CA 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're looking for a Senior IT Support Engineer to join our User Services team in Mountain View. This is a hands-on, broad-scope role: you'll be the primary technical resource for our employees-onsite and remote-while also owning the core systems and infrastructure that keep the company running. Day to day, you'll split your time between resolving support tickets and administering the platforms behind them: cloud and productivity suites, identity management, our endpoint/MDM fleet, and conference room/AV environments, along with procurement and deployment of new hardware. You'll report to the Head of User Services and partner closely with the broader IT team on company-wide rollouts and larger projects. This is a senior individual-contributor role. We expect you to take full ownership of your

Laser Characterization, Temp Mountain View, CA 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! As a Laser Characterization Intern, you will focus on the fundamental performance, physics, and characterization of the semiconductor laser sources that power our photonic computing architecture. You will be responsible for executing State-of-the-Art (SOA) laser testing to ensure the highest levels of spectral purity and stability. Responsibilities - Perform hands-on characterization of semiconductor lasers, laser sources, and semiconductor optical amplifiers. - Measure and analyze laser and SOA performance metrics, including output power, wavelength, optical spectrum, side-mode suppression ratio, relative intensity noise, gain, saturation behavior, and wavelength/power stability. - Conduct LIV measurements and evaluate laser behavior across current, voltage, temperature, and operating conditions. - Perform wavelength and optical power stability measurements over time and across temperature. - Characterize optical spectra using optical spectrum

Staff Electrical Design Engineer Mountain View, CA 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! Staff Electrical Design Engineer About this Role We are looking for a Senior Electrical Design Engineer to contribute to the development of the next generation of silicon photonics based artificial intelligence accelerators and interconnect products. In this role, you will lead board and system solutions that leverage Lightmatter's technology to enable advanced machine learning, artificial intelligence, and large-scale interconnect platforms. You will lead and own HW systems efforts, collaborate closely with teams across hardware and software, including mechanical, packaging, and IC engineering, to design, integrate, troubleshoot and release system-level products at the leading edge of innovation. Responsibilities - Collaborate with the system architect and technical leads to define system-level hardware requirements and spec - Electrical design of power, memory, and interconnect

System Mechanical Design Engineer Mountain View, CA 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 seeking a motivated, dedicated, and hands-on mechanical design engineer to help develop a chassis and rack platforms for the next-generation artificial intelligence server alongside a team of world-class scientists and engineers. As a Mechanical Engineer at Lightmatter, you will sit at the critical intersection of silicon photonics, advanced 3D packaging, and extreme-density thermal management. You won't just be tweaking existing designs; you will be the practical execution engine transforming complex electro-optical concepts into scalable, manufacturable hardware. While this role focuses on flawless technical execution rather than top-level project architecture, your hands-on impact will be immense. You will navigate the transition from initial CAD and prototype builds to leading external Contract Manufacturers (CMs). If you are a

Staff Embedded Software Engineer, Lasers Mountain View, CA 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! This unique opportunity focuses on defining the control plane architecture for next-generation photonic interconnect products and implementing active laser control and stabilization algorithms. You will leverage your proven history of shipping embedded systems at scale to deliver products that enable extreme-scale artificial intelligence computing clusters. Your expertise will make a profound and visible impact on the business by directly enabling the next generation of computing technology. Responsibilities - Collaborate across a multidisciplinary team including Photonic, Analog, Digital, Systems and Network experts to define control plane architecture for Lightmatter's photonic interconnect products. - Define diagnostics and monitoring architecture for photonic transceivers. - Implement active laser control and stabilization algorithms in collaboration with a cross-functional design team. - Integrate with DataCenter administration

Sr. Firmware Development & Test Automation Engineer Boston, MA 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 talented software QA engineer to help us build the next generation of photonic AI processors and interconnects. In this role, you will be responsible for planning and automating device software and firmware testing capabilities for Photonic Compute and Photonic interconnect products. You will collaborate with other software teams and hardware systems teams to enhance the delivery of quality software. You will leverage your skills with standard methodologies and tools to effectively implement industry best practices in our environment. Responsibilities - Develop and execute comprehensive test plans and test cases for embedded software and systems. - Set up and maintain CI/CD pipelines for automated testing and deployment. - Conduct Hardware-in-the-Loop (HIL) testing to

Sr Staff Design Verification Mountain View, CA 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! As a Design Verification Engineer at Lightmatter, you will find yourself at the heart of a dynamic, interdisciplinary team. Your role will involve close collaboration with our digital design experts, using UVM testbench techniques to rigorously verify their designs. Your responsibilities will include working alongside photonic and analog designers, gaining a deep understanding of their innovative designs, and applying Real Number Modeling (RNM) and AMS verification methods. This critical function ensures the integrity of their work. We are hiring at multiple levels. Your interaction with the Architecture team will be crucial in comprehending system requirements and spearheading performance verification. This role offers a unique platform to enhance your skills across a spectrum of areas including UVM, AMS modeling, mixed-signal verification, post-silicon

Staff Physical Design Engineer Mountain View, CA 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 seeking a highly skilled Senior Physical Design Engineer to work on the implementation of complex digital blocks. In this role, you will leverage your expertise in advanced process nodes (3nm) to drive timing closure, power integrity, and physical verification for high-performance ASICs. Beyond standard digital flows, you will have the unique opportunity. To work alongside a team of world-class scientists and engineers in defining how the system will be optimized and trailblaze problems that are new to the photonics industry! If your passion is innovation, solving challenging technical problems and doing impactful work you should join our team! Responsibilities - Implement digital blocks in advanced tech nodes from synthesis through physical verification, using industry standard tools and flows -

Sr Staff Design Verification Engineer Toronto, ON 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! As a Design Verification Engineer at Lightmatter, you will find yourself at the heart of a dynamic, interdisciplinary team. Your role will involve close collaboration with our digital design experts, using UVM testbench techniques to rigorously verify their designs. Your responsibilities will include working alongside photonic and analog designers, gaining a deep understanding of their innovative designs, and applying Real Number Modeling (RNM) and AMS verification methods. This critical function ensures the integrity of their work. We are hiring at multiple levels. Your interaction with the Architecture team will be crucial in comprehending system requirements and spearheading performance verification. This role offers a unique platform to enhance your skills across a spectrum of areas including UVM, AMS modeling, mixed-signal verification, post-silicon

Chip Firmware Validation Engineer Mountain View, CA 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 -

Sr. Staff Thermal Engineer Boston, MA; Mountain View, CA 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 seeking a Thermal Engineer with strong expertise in thermal analysis and deep knowledge of semiconductor packaging technologies to join our team. In this role, you will work on leading-edge packaging technologies to enable AI architectures that set new industry standards in compute power, performance, and efficiency. As a part of the package technology team, you will be responsible for leading thermal analysis required for product definitions, driving innovative thermal solutions, and conducting analysis and validation efforts to deliver package and system designs that meet product landing zones. Your work will contribute to advanced package and system designs that meet power dissipation, assembly, and reliability requirements while delivering system-level solutions for leading-edge products in data centers and high-end