What MatX Is Building

MatX is building next-generation AI compute infrastructure for large-scale LLM training and inference. We are looking for an experienced PCB Layout Engineer to design and deliver high-speed, high-power, high-density printed circuit boards for our AI chip, compute tray, and rack-scale platform. This is a hands-on role where layout quality directly impacts signal integrity, power integrity, and system performance.

What You'll Do Here

Own PCB layout from floorplanning through final Gerber release for complex, high-layer-count boards (AI accelerator boards, compute trays, backplanes)

Design high-speed differential pair and controlled impedance routing for PCIe Gen5/6, CXL, and Ethernet 112G/224G interfaces, including length matching and timing constraints per SI/PI guidelines

Plan stack-ups (layer assignment, impedance control, via structure, laminate selection) and place/route complex BGA packages, including AI ASICs

Design power delivery networks (PDN) — VRM placement, decoupling capacitors, and power planes to meet PI requirements, partnering with SI/PI engineers on simulation and pre/post-layout analysis

Ensure DFM/DFT/DFA compliance (test points, via-in-pad, back-drill, assembly constraints) and coordinate with mechanical engineers on board outline, keep-outs, and chassis constraints

Lead design, layout, and DFM reviews with JDM/ODM partners, and manage release packages (Gerbers, fabrication notes, stackup docs, footprint libraries)

Support bring-up, debug, and signal probing to resolve layout-related issues

Who You Are

7+ years of PCB layout experience, including complex multi-layer boards (20+ layers) for server, AI compute, networking, or similar high-performance hardware

Strong proficiency in Cadence Allegro (or equivalent EDA tool), with deep expertise in high-speed design: differential pair routing, impedance control, length matching, reference planes, and via optimization

Experience with fine-pitch BGA placement/routing for AI ASICs, GPUs, or high-density packages, and hands-on work with high-speed interfaces (PCIe Gen5/6, CXL, DDR5, 112G/224G SerDes)

Strong understanding of PDN design (VRM placement, decoupling strategy, power planes, current return paths) and stack-up design (layer count, impedance control, material selection, e.g. Megtron 6/8/9, TU-953Q)

Familiarity with back-drilling, via-in-pad, and other advanced fabrication techniques, plus DFM/DFT requirements (test point coverage, copper balance, solder mask, assembly constraints)

Ability to interpret SI/PI simulation results and incorporate feedback into layout

Experience releasing fabrication packages (Gerbers, drill files, stackup specs) and working directly with PCB fabricators and JDM/ODM partners on high-speed, high-layer-count boards

Bonus Points

Experience with 5nm or 3nm and below AI ASIC board layout, ultra-fine pitch BGA, high-density routing

Experience with 224G PAM4 high-speed interface routing and material selection

Knowledge of fiber weave effect mitigation — routing at 45°, spread glass laminates

Familiarity with OCP Open Rack board form factors and mechanical constraints

Experience with power integrity simulation tools (Ansys SIwave, Cadence Sigrity)

Background in EMI/EMC design, stitching vias, ground guard traces, and shielding techniques

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 Security: Choose from Roth or pre-tax 401K (or both) with a 5% company contribution (even if you don't contribute), 100% company-paid life insurance (up to $300K), long-term disability and travel insurance.