Senior Staff SI/PI Engineer

Role Overview 

As an SI/PI, Package and Power Delivery Engineer at Tylsemi, you will own signal integrity, power integrity, and package/PDN co-design across chip, package, and board interfaces. You will work closely with SoC, physical design, analog, package, board, and validation teams to ensure robust high-speed links, stable power delivery, and predictable signoff from early architecture through tapeout and bring-up. This role is ideal for engineers who enjoy cross-domain problem solving and turning complex electrical constraints into clean, manufacturable solutions. 

What You’ll Do 

• Drive SI/PI methodology and execution from early planning through signoff for high-speed interfaces and power delivery networks 

• Perform package/board/chip co-design: define stackups, routing constraints, via strategies, reference planes, and return-path integrity 

• Model and analyze high-speed channels (e.g., SerDes, DDR, PCIe, USB, Ethernet) including insertion/return loss, crosstalk, jitter, eye margins, and equalization tradeoffs 

• Build and validate electrical models (IBIS/IBIS-AMI, S-parameters, SPICE) and ensure model correlation and version control hygiene 

• Own PDN design and analysis across die/package/board: impedance targets, decap strategy, anti-resonance mitigation, and rail stability 

• Run PI signoff including DC/AC IR drop, EM, dynamic droop/noise, and power/ground bounce; drive fixes with clear, reviewable action plans 

• Partner with physical design and signoff teams on power grid architecture, bump/ball planning, current density limits, and rail partitioning 

• Collaborate with package engineering on substrate routing, escape, ballout, and manufacturability constraints; review and approve package design deliverables 

• Define and enforce design rules/constraints for routing, spacing, shielding, length matching, and reference plane transitions 

• Support lab bring-up and correlation: translate silicon/package/board measurements into model updates and design improvements 

• Create and maintain automation, checks, and reporting (Python/Tcl or equivalent) to improve predictability, repeatability, and execution speed 

• Contribute to tapeout readiness: documentation, checklists, design reviews, and root-cause analysis to prevent recurrence 

What We’re Looking For 

• 10+ years of hands-on experience delivering SI/PI and package/PDN solutions for complex SoCs (scope aligned to level of experience) 

• Strong fundamentals in transmission lines, S-parameters, impedance, return paths, coupling/crosstalk, and power delivery behavior across frequency 

• Ability to translate system requirements into actionable constraints and to drive closure across multiple teams and design stages 

• Methodical debug skills: clear problem statements, data-driven root cause, and practical mitigation plans 

• Strong communication and engineering hygiene: reproducible analyses, clean documentation, and review-friendly deliverables 

Required Skills 

• Signal Integrity (SI) analysis for high-speed interfaces 

• Power Integrity (PI) / PDN design and analysis (chip-package-board) 

• Package and power delivery co-design (substrate/ballout/bumps, stackup and routing constraints) 

• Electrical modeling (S-parameters, SPICE, IBIS/IBIS-AMI) and correlation mindset 

• Cross-functional execution with SoC/PD/analog/package/board/validation teams 

Nice to Have 

• Experience with industry tools for SI/PI and package analysis (e.g., HFSS, SIwave, ADS, HSPICE/Spectre, PowerSI, Clarity, Ansys RedHawk/Voltus or equivalents) 

• DDR/LPDDR and SerDes compliance experience (channel budgets, jitter/noise decomposition, margining) 

• Advanced packaging exposure (2.5D/3D, interposers, chiplets, HBM, CoWoS/EMIB-like concepts) and related SI/PI challenges 

• Thermal-awareness in PDN/package decisions and collaboration with thermal/mechanical teams 

• Experience defining signoff criteria, templates, and reusable flows across programs 

Success in This Role Looks Like 

• Predictable SI/PI closure with clear milestones, risk tracking, and minimal late-stage surprises 

• Robust package/PDN solutions that meet impedance/noise/jitter targets and scale cleanly to production 

• Fast, high-quality debug and mitigation of SI/PI issues with strong cross-team alignment 

• Well-documented, reproducible analyses and signoff artifacts that improve team velocity and tapeout readiness 

Compensation

The compensation range shown below represents total target cash compensation and includes both base salary and target bonus. Actual compensation will vary based on factors such as experience, skills, qualifications, job level, and work location.

In addition to cash compensation, this position is eligible for equity in the form of stock options, giving you the opportunity to share in the Company’s long-term growth and success.