Power Integrity 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 Lightmatter is looking for a Power Integrity engineer to drive the next generation products from concept to development. You will be part of the Signal Integrity, Power Integrity and Packaging team, tasked with influencing the package and system architecture, design, and analysis through lab bring-up to meet the product's power integrity requirements. This position offers a unique opportunity to solve complex interactions across digital, analog and photonics domains while meeting stringent power integrity goals. Responsibilities Support the design and analysis of Power Delivery Networks (PDNs) for digital and analog SoC domains, including path from voltage regulators to on-chip decoupling capacitors. Assist in modeling regulator characteristics such as switching ripple and transient response to aid in component selection (controllers, passives, etc.). Use commercial simulation tools (e.g., 2.5D EM solvers) to extract PCB and package impedance profiles and help generate N-port models. Perform basic time-domain and frequency-domain simulations to evaluate supply rail behavior and identify potential issues such as voltage droop or overshoot. Conduct lab measurements to validate power integrity design, including use of programmable loads and oscilloscopes to capture transient response. Work closely with hardware designers, layout engineers, and system integrators to implement PDN design improvements and validate results. Participate in design reviews and contribute to documentation of analysis results, test procedures, and design recommendations. Help monitor and review PDN constraints during layout and provide feedback based on simulation or measurement data. Support senior engineers in system-level tradeoff studies and architectural evaluations related to power integrity. Qualifications M.S. or Ph.D. in Electrical Engineering or a related field. 3+ years of experience in power delivery and power integrity analysis for high performance CPUs and compute SoCs. Proficiency in using simulation and analysis tools for power integrity, including PowerSI, PowerDC, IDEM, H-Spice and Keysight ADS. Experience in DC-DC converter design. Experience with PCB design and layout considerations for power integrity, including layer stack-up assignment, power plane partitioning, capacitor selection and placement, and microvia/PTH design. Strong problem-solving and debugging skills for power integrity-related issues. Preferred Qualifications Working knowledge of different 2D/2.5D/3D packaging technologies and associated PDN challenges. Familiarity in using lab equipment for signal measurement and characterization, such as oscilloscopes and network analyzers. Proficiency in scripting languages such as Skill, TCL, Python, and Matlab for automation of design and modeling flows and post-processing results We offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data. Salary Range: total compensation goes beyond base salary, it also includes a new hire equity grant, annual performance-based equity, and other rewards that recognize your impact and contribution. $157,000 — $176,000 USD 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.