SIPI Characterization Engineer

What MatX Is Building

MatX'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 Role

We 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 Do

SerDes Characterization & Validation

Characterize high-speed SerDes interfaces (PCIe, Ethernet, custom protocols) including BER testing, eye diagram analysis, and PVT characterization

Tune and optimize SerDes Tx and Rx equalization settings

Perform 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 accuracy

Power Integrity Characterization

Measure and analyze high-current power rail transient noise and dynamic voltage droop on complex accelerator power delivery networks

Characterize PDN impedance from board through package and silicon, and compare against target impedance specifications

Identify PDN design weaknesses and collaborate with power delivery and board design teams to define and validate mitigation strategies

Test Automation & EDVT

Architect, develop, and maintain scalable test automation frameworks for Electrical Design Validation Testing (EDVT) across thousands of SerDes channels on multi-chip accelerator compute systems

Integrate lab instruments (oscilloscopes, BERTs, VNAs, power analyzers) into automated test flows using Python or equivalent scripting environments

Build robust data pipelines for test result collection, statistical analysis, and visualization to enable rapid triage and design decisions

Design Collaboration

Partner with SIPI engineers on optimization for advanced package designs, including die-to-die interconnects, bump arrays, and interposer structures

Collaborate with board designers on PCB stackup definition, trace routing rules, via optimization, and decoupling strategies for high-speed accelerator boards

Provide characterization data and actionable recommendations to influence layout guidelines, design rules, and future silicon/package revisions

What We're Looking For

Experience & Education

5–10 years of industry experience in hardware characterization, SI/PI engineering

Bachelor's degree or higher in Electrical Engineering; advanced degree a plus

Deep understanding of high-speed SerDes architecture and operation — PHY layer fundamentals, equalization, jitter decomposition, and link margin analysis

Strong grasp of transmission line theory — wave propagation, impedance matching, reflections, skin effect, and dielectric loss

Solid understanding of PDN design principles — target impedance, resonance, bypass capacitor placement, and voltage regulator loop dynamics

Hands-on proficiency with lab equipment

Experience writing test automation scripts in Python (preferred)

Bonus Points

Background in AI accelerator or GPU system validation

Familiarity with JEDEC or PCIe compliance testing methodologies

Experience with statistical process control (SPC) or large-scale data analysis for silicon characterization

Ability to do layout review for PCB, and advanced package design is a plus

Compensation

The 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 - $160,000 - $275,000 + equity

Mid Career - $175,000 - $400,000 + equity

Senior Career - $250,000 - $600,000 + equity

What We Offer

Time off: 4 weeks PTO (accrued) + 12 company Holidays + up to 3 weeks remote work

Health: Company-subsidized Medical (Kaiser or Anthem) for employees & dependents, Guardian Dental and Vision insurances for employee & dependents, and life insurance (employee only), plus HSA and FSA offerings via Lively.

Financial Wellbeing: Choose from Roth IRA or 401K (or both) retirement plans with up to 5% company contribution to 401K (even if you don't contribute). Also, 100% company-paid life insurance (up to $300K) and long-term disability insurances.

Professional Development: $1500 Professional Development Budget (per year)

Team Meals: MatX provides onsite team lunch & dinner Monday - Friday, with your choice of ordering via WeBox, Specialty’s or via our reimbursement system

Commute on Us: Commute on our company Uber account, or reimburse your train rides. Either way, we pay 100% for your daily commute.

MatX E[x]tras: $50/mo to use on the perk you value most

Cell & Internet Reimbursement: $35/mo for cellular and $40/mo for wifi

Remote Home Setup: Use our Amazon business account for up to $1000 in office setup purchases.

Mental Wellbeing: 100% paid mental health benefit via SpringHealth and Guardian EAP.

Support to Parents: Up to 12 weeks paid parental leave regardless of path to parenthood, 10 weeks pregnancy disability leave, flexible return-to-work hours, and Benepass reproductive health & parental benefit.

• As 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.
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• This position requires access to information that is subject to U.S. export controls. This offer of employment is contingent upon the applicant's capacity to perform job functions in compliance with U.S. export control laws without obtaining a license from U.S. export control authorities.
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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.