Silicon Packaging Engineer (SIPI)

Job description

We are seeking a highly skilled Signal Integrity and Power Integrity (SI/PI) Engineer to own chip-package-system co-design for next-generation AI accelerator and high-performance computing silicon. In this role you will drive SI/PI requirements from architecture definition through post-silicon validation across 2.5D/3D heterogeneous packages — silicon interposer, RDL fan-out, wafer-on-wafer die stacking, and high-density organic substrates.

You will work closely with ASIC architecture, physical design, package layout, PCB, and foundry/OSAT partners to ensure high-speed interfaces and power delivery networks meet performance, margin, and reliability targets before tape-out and Gerber release.

Responsibilities

Chip-Package-System Co-Design

Drive SI/PI requirements analysis and optimization into product definition — chip floorplan, bump map, power tree structure, and net topology — for HPC and AI silicon built on 2.5D/3D package technology.

Die-Package-Board Co-Optimization (DPCO)

Partner with package layout and physical design to converge bump assignment, escape routing, and stack-up decisions across multiple disparate chiplets.

Package SI/PI Ownership

Lead ASIC package SI/PI design activities including substrate and interposer stack-up and material selection, design guide authoring, layout review, and post-layout sign-off.

High-Speed Interfaces

Own channel design and margining for HBM/HBM4/UHBM, UCIe and other die-to-die links, PCIe Gen 5/Gen 6, Ethernet SerDes, and next-generation memory interfaces.

Power Delivery

Execute package and board PDN AC+DC analysis for low-voltage/high-current supplies, including impedance targeting, decoupling optimization, IR drop, and di/dt noise.

Simulation Flow

Lead pre-layout and post-layout simulation flows for high-speed I/O and PDN; build simulation models and develop reusable SI/PI methodology.

Timing & Budgets

Develop and maintain interface timing budgets and voltage/noise budgets spanning silicon IO PHY, package, and board.

Tool & Flow Development

Improve the accuracy and turnaround time of SI/PI flows through automation and correlation-driven model refinement.

Validation Methodology

Define SI/PI validation methodology and detailed engineering test plans.

Post-Silicon

Conduct post-silicon validation and qualification of high-speed interfaces; measure PDN impedance and channel performance in the lab and correlate against simulation.

Failure Analysis

Support Design Validation teams on SI/PI failure analysis and drive corrective design guidance back into the flow. Work across Architecture, ASIC, Mixed Signal, Package, PCB, and System teams to ensure package and system SI/PI performance meets expectation before Gerber out. Engage foundries and OSATs (e.g., TSMC CoWoS/SoIC, Intel EMIB) and memory suppliers on emerging interconnect and die-stacking standards.

Qualifications

• Bachelor's degree in Computer Science, Computer Engineering, relevant technical field, or equivalent practical experience
• 8+ years of experience with signal integrity analysis, simulation, and measurement
• Proficient with HFSS, Sigrity, Hspice, and/or other simulation tools
• Proven understanding of impedance control, transmission line and PDN characterization, feasibility study and create practical design guidelines Experience with 2.5D/3D package design (e.g., silicon interposer, silicon bridge, 3D die stacking, STA, Voltage budget, complex SIPI models, frequency, and time domain simulation) Expertise in signal and power integrity for various high speed interconnects (e.g., HBMx, D2D, Ethernet, PCIe and etc)
• Familiarity with post-Si test environment on memory (HBM/ /DDR4/LPDDR4/DDR5/LPDDR5) or high speed SERDES Familiarity to next generation memory and chiplet standards and timing budget methodology Package-level signal integrity and power integrity understanding including silicon, package, and board
• 10+ years of experience in SIPI simulation and validation areas
• Master degree or PhD in Electrical Engineering, Physics, Mathematics, or related field Experience with high-speed interface protocols such as MIPI, PCIe, memory, HBMand USB Experience using Cadence Sigrity, PowerSI, Ansys SIwave, Keysight ADS, 3D layout and Ansys HFSS Experience with consumer hardware design, review and bring-up process, CAD tools, constraint manager etc
• 8+ years of experience in SIPI fundamentals, familiar with substrate/PCB design and manufacture process Experience in collaborating with cross-functional teams, including chip top design, physical design, Static Timing Analysis (STA), package, and system teams
• Solid understanding and experiences in computational electromagnetics and transmission line theory