Principal Signal and Power Integrity Engineer.

About the role

Who We Are We are a stealth‑mode startup building foundational technology to address performance, scalability, and resiliency challenges in large‑scale AI data center clusters. We are backed by top‑tier VC firms and notable angel investors. The company is led by experienced builders and operators who have founded companies, taken them to scale, and exited successfully. We work with a strong sense of unity and shared responsibility, and we expect trust, integrity, and respect in how we collaborate and make decisions. We hold ourselves accountable to one another and to the quality of the work we deliver. Headquartered in Silicon Valley, we operate across a mix of remote and on‑site locations in the U.S. and Canada. We aim to create an environment where people are treated fairly, supported in their growth, and are empowered to do meaningful work alongside others who take the craft seriously. Some Recent Press: https://www.eetimes.com/startup-boosts-scale-up-to-1000-gpus-in-a-single-domain/ What We Need A Senior SI/PI Engineer responsible for modeling, simulating, and validating high‑speed and high-power electrical performance across advanced multi‑die packages and system interconnects. This role ensures signal fidelity, robust power delivery, and strong correlation between simulation and hardware for next‑generation AI compute systems. Key Responsibilities Perform pre‑ and post‑layout SI simulations (eye diagrams, crosstalk, insertion/return loss) for UCIe, D2D, SerDes, and Ethernet links. Model PDNs for low‑voltage, high‑current rails; run AC/DC, impedance, and IR‑drop simulations; come up with decoupling cap selection. Build and validate S‑parameter, IBIS‑AMI, and behavioral models for packages, PCBs, sockets and cables. Guide PCB/package layout teams on stack‑ups, routing constraints, return‑path continuity, and decoupling strategy. Conduct bring‑up, VNA/TDR measurements, oscilloscope validation, and correlate hardware results with simulations. Collaborate with IC design, packaging, and board teams to define electrical requirements and debug issues. Evaluate new SI/PI methodologies, materials, and tools for next‑generation architectures. Evaluate emerging interconnect technologies such as CPC, CPO, and establish electrical-optical-electrical end-to-end simulation and validation methodologies. Required Skills & Qualifications B.S./M.S. in Electrical Engineering or related field. Deep understanding of EM theory, transmission lines, and high‑speed signaling. Expertise with SI/PI tools (Keysight ADS, Ansys HFSS, Cadence Sigrity/PowerSI). Experience with UCIe, D2D, SerDes, or Ethernet interfaces. Knowledge of PCB materials, stack‑ups, and constraint‑driven design. Hands‑on experience with VNA, TDR, oscilloscopes. Python/Matlab scripting for automation is a plus. Compensation Target base salary for this role is $180,000–$240,000 per year + meaningful equity + benefits + 401k. Our salary ranges are determined by role, level, experience, and location. We are an equal opportunity employer. We value a range of perspectives and experiences and make employment decisions based on merit and business needs. We do not discriminate on the basis of legally protected characteristics. Agency Note: We do not accept resumes from agencies or search firms. Please do not forward candidate profiles through our careers page, email, LinkedIn messages, or directly to company employees. Any resumes submitted will be deemed the property of the company, and no fees will be paid in the event the candidate is hired. #LI-EW1