Sr Principal Signal Integrity Engineer

Forming Our Future together

Form Factor, Inc. (NASDAQ: FORM), is a leading provider of essential test and measurement technologies along the full semiconductor product life cycle - from characterization, modeling, reliability, and design de-bug, to qualification and production test. Semiconductor companies rely upon Form Factor's products and services to accelerate profitability by optimizing device performance and advancing yield knowledge. The company serves customers through its network of facilities in Asia, Europe, and North America.

Rooted in our core values - Focus on the Customer, Ownership & Accountability, Respectfully & Effectively Communicate, and Motivate & Develop People - we foster an environment where diverse perspectives are not only welcomed but celebrated. Everyone can make an impact here. Whether it's improving products, supporting customers, or positively influencing peers and the community, the contributions of our people matter.

The regular hours for this position are day shift.

Form Factor's Probes Product Development team is hiring a Signal Integrity (SI) Engineer to architect, simulate, and validate high-speed interconnect performance across complex, fine pitch probe card assemblies used for advanced wafer test. This role is critical in ensuring high-speed electrical performance and signal integrity for advanced semiconductor test solutions. The ideal candidate will have strong expertise in high-frequency design, simulation, and analysis to support next‑generation probe card technologies for leading semiconductor manufacturers.

• Perform signal integrity analysis for high-speed interconnects in probe card assemblies.
• Develop and validate electrical models for transmission lines, connectors, probes, and PCB/MLO structures.
• Define electrical stack‑ups and impedance targets.
• Perform what‑if studies to optimize high‑frequency behavior.

• Utilize tools such as HFSS, ADS, or equivalent for electromagnetic and circuit simulations.
• Conduct time-domain and frequency-domain analysis to ensure compliance with performance requirements.
• Build IBIS AMI or behavioral channel models and eye diagrams for target data rates (e.g., 16-448 Gbps PAM4/NRZ).

• Define and execute test plans for signal integrity validation using high-speed measurement equipment (e.g., VNA, TDR).
• Develop fixtures and golden structures.
• Drive simulation to measurement correlation.
• Analyze test data and correlate with simulation results to refine design.

• Drive innovation in probe card electrical design to support evolving semiconductor technology nodes.
• Stay current with industry trends in high-speed interconnects and signal integrity best practices.

• Strong understanding of signal integrity, including transmission line theory, crosstalk reduction, power integrity, and highspeed interface performance.
• Proficiency in EM & circuit tools: HFSS/CST/SIwave + ADS/Sigrity (or equivalents).
• Hands on VNA/TDR/TDT measurement and de‑embedding skills.
• Scripting experience for data analysis, automation, or workflow optimization.
• Familiarity with PCIe/HBM/Ser Des channel requirements and PAM4 systems.
• Experience with probe cards, interposers, fine pitch interconnects, MEMS probes, or advanced socketing is a plus.

ANSYS HFSS, ANSYS SIwave, Autodesk AutoCAD, Cadence Tools, Electromagnetic Simulations, High Frequency Measurements, MATLAB, Path Wave Advanced Design System (ADS), Power Integrity, Python (Programming Language), Signal Integrity, Solid Works, Vector Network Analyzer (VNA).

Minimum of 8 years of related experience with a Bachelor's degree; or 6 years and a Master's degree; or a PhD with 3 years experience; or equivalent experience.

$ - $

This role in Livermore, California pays between $ and $ per year, depending on your experience, skills, and background. Pay may vary in other locations. We offer a full benefits package, including medical, dental, vision, life insurance, disability coverage, a 401(k) with company match, employee stock purchase…