SIPI Characterization Engineer

What MatX Is BuildingMatX's mission is to make the world’s best AI models run as efficiently as allowed by physics, bringing the world years ahead in AI quality and availability.About the RoleWe are looking for a skilled and hands-on Signal Integrity, Power Integrity, and Characterization (SIPI) Engineer to join our hardware team. In this role, you will own electrical characterization of high-speed SerDes interfaces and power delivery networks across our AI accelerator compute systems. You will build and scale test automation infrastructure capable of covering thousands of channels, while collaborating closely with SIPI engineers and board designers to influence and validate designs from early concept through production.What You'll DoSerDes Characterization & ValidationCharacterize high-speed SerDes interfaces (PCIe, Ethernet, custom protocols) including BER testing, eye diagram analysis, and PVT characterizationTune and optimize SerDes Tx and Rx equalization settingsPerform channel characterization including insertion loss, return loss, and crosstalk measurements using VNA and time-domain reflectometry (TDR)Develop and execute correlation methodologies to align simulation predictions with measured results; drive feedback loops to improve modeling accuracyPower Integrity CharacterizationMeasure and analyze high-current power rail transient noise and dynamic voltage droop on complex accelerator power delivery networksCharacterize PDN impedance from board through package and silicon, and compare against target impedance specificationsIdentify PDN design weaknesses and collaborate with power delivery and board design teams to define and validate mitigation strategiesTest Automation & EDVTArchitect, develop, and maintain scalable test automation frameworks for Electrical Design Validation Testing (EDVT) across thousands of SerDes channels on multi-chip accelerator compute systemsIntegrate lab instruments (oscilloscopes, BERTs, VNAs, power analyzers) into automated test flows using Python or equivalent scripting environmentsBuild robust data pipelines for test result collection, statistical analysis, and visualization to enable rapid triage and design decisionsDesign CollaborationPartner with SIPI engineers on optimization for advanced package designs, including die-to-die interconnects, bump arrays, and interposer structuresCollaborate with board designers on PCB stackup definition, trace routing rules, via optimization, and decoupling strategies for high-speed accelerator boardsProvide characterization data and actionable recommendations to influence layout guidelines, design rules, and future silicon/package revisionsWhat We're Looking ForExperience & Education5–10 years of industry experience in hardware characterization, SI/PI engineeringBachelor's degree or higher in Electrical Engineering; advanced degree a plusDeep understanding of high-speed SerDes architecture and operation — PHY layer fundamentals, equalization, jitter decomposition, and link margin analysisStrong grasp of transmission line theory — wave propagation, impedance matching, reflections, skin effect, and dielectric lossSolid understanding of PDN design principles — target impedance, resonance, bypass capacitor placement, and voltage regulator loop dynamicsHands-on proficiency with lab equipmentExperience writing test automation scripts in Python (preferred)Bonus PointsBackground in AI accelerator or GPU system validationFamiliarity with JEDEC or PCIe compliance testing methodologiesExperience with statistical process control (SPC) or large-scale data analysis for silicon characterizationAbility to do layout review for PCB, and advanced package design is a plusCompensationThe US base salary for this full-time position is determined based on a variety of factors including role, experience, location, job related skills, and relevant education and training. Career length is only a guideline for compensation.Early Career - $120,000 - $250,000 + equityMid Career - $175,000 - $362,500 + equitySenior Career - $250,000 - $475,000 + equityWhat We OfferA Stake in our success A flexible cash equity compensation mix that fits your needsHeath & Wellness Company subsidized Health, Dental, Vision, and Life insurance; Pre-tax Health Savings Accounts with generous company contribution (even if you don’t)Time To Recharge 4 weeks paid time off (accrued), 12 company holidays, and 3 weeks remote/flexible work per yearSupport to Parents Up to 12 weeks of paid parental leave, regardless of your path to parenthoodLearning & Development $1,500 yearly towards your professional development e.g. conferences, courses, and other learning opportunitiesTeam Connection Team Lunches, quarterly off-sites, and regular town hallsFinancial Wellbeing 401K and/or Roth IRA, with 5% company contribution, even if you don’t!Flexible Spending Accounts Pre-tax spend accounts for medical, dental/vision, dependent care, parking, and transit expensesCommute On Us For those commuting up to 1 hour, put your rideshare cost on our company card and reclaim the drive-time to get work done!MatX E[x]tras $50 per month to use on the perks you care about most Remote Perks We work remotely Monday & Friday, supported by home-tech setup, and remote wifi expense reimbursementAs part of our dedication to the diversity of our team and our focus on creating an inviting and inclusive work experience, MatX is committed to a policy of Equal Employment Opportunity and will not discriminate against an applicant or employee on the basis of race, color, religion, creed, national origin or ancestry, sex, gender, gender identity, gender expression, sexual orientation, age, physical or mental disability, medical condition, marital/domestic partner status, military and veteran status, genetic information or any other legally recognized protected basis under federal, state or local laws, regulations or ordinances.All candidates must be authorized to work in the United States and work from our offices in Mountain View Tuesdays-Thursdays.This position requires access to information that is subject to U.S. export controls. This offer of employment is contingent upon the applicants capacity to perform job functions in compliance with U.S. export control laws without obtaining a license from U.S. export control authorities.MatX does not accept unsolicited resumes from individual recruiters or third-party recruiting agencies in response to job postings. No fee will be paid to third parties who submit unsolicited candidates directly to our hiring managers or People team and any resumes submitted are deemed to be the property of MatX.