Senior Optical Signal Integrity / Power Integrity (SI/PI) Engineer

Arista Networks is seeking a Senior Optical Signal Integrity / Power Integrity (SI/PI) Engineer to lead the design, simulation, and validation of high-speed electrical interconnects and power delivery networks (PDNs) for next-generation optical modules and engines — including 1.6T, and emerging high density platforms using 224G, and 448G signaling. This position is critical in ensuring system-level performance across advanced photonic systems through robust SI/PI design and validation. You’ll work closely with hardware architects, ASIC vendors, layout, packaging, and optical teams to co-optimize performance, manufacturability, and reliability for state-of-the-art networking hardware.

• Lead signal integrity (SI) and power integrity (PI) efforts for high-speed optical transceiver modules, high density optical interconnect platforms.
• Design and simulate high-speed channels up to 448G per lane (e.g., 224G/448G PAM4) across PCBs, packages, and connectors.
• Perform pre- and post-layout SI/PI simulations using tools like Ansys HFSS, Keysight ADS, Cadence Sigrity, and SiSoft QSI.
• Develop and validate PCB stackups, via structures, high-speed breakout regions, and connector transitions to meet compliance with IEEE, CEI, and MSA standards.
• Work closely with electrical, optical, and layout teams to define routing constraints, reference plane designs, and return path continuity for minimal signal degradation.
• Design and optimize PDNs to meet target impedance, minimize noise coupling, and support fast transient loads for high-speed DSPs and ICs.
• Provide SI/PI layout guidelines to PCB designers and review placement/routing for high-speed paths and power domains.
• Collaborate with validation teams to perform measurements (TDR, VNA, eye diagram, jitter, BER) and correlate with simulation models.
• Engage with ASIC, connector, and packaging vendors to support co-design and channel optimization across multiple integration layers.
• Drive root cause analysis of SI/PI-related issues during validation and production builds.