Siyuan Xie

About Siyuan Xie

Senior Software Engineer with 6+ years of experience building and scaling large-scale checkout and payment systems at eBay. I focus on backend engineering, system design, and distributed workflows — designing reliable, observable, and business-critical services that support global buyer transactions.I’ve delivered major platform features across ordering, checkout, and payment flows—designing async workflows, ensuring data consistency during order changes in flight, and expanding support for multi-instrument payments and new forms of payment.I actively embrace AI in my engineering workflow—from using AI to accelerate design, debugging, and exploration, to building internal triage agents with LangChain/MCP that reduce on-call load and improve operational efficiency. I enjoy solving real problems that sit at the intersection of product and engineering — collaborating across product, design, payments, risk, SRE, and frontend teams to deliver systems that are practical, scalable, and resilient.Areas of interest: Backend systems & distributed services Payments, checkout, and transactional workflows System design & data consistency Observability & debugging at scale AI agents, multi-agent orchestration, and workflow automationI’m always interested in meaningful conversations around backend engineering, payments, AI or system design.

Experience

1. Member of Technical Staff

   eBay

   Mar 2025 — Present · US

   Lead backend engineering for checkout and order processing systems powering global buyer transactions across eBay marketplace.Own feature delivery end-to-end — system design, implementation, testing, production rollout, and monitoring — across business-critical payment and order pipelines.Collaborate closely with product, design, payment, risk, SRE, and frontend teams to drive alignment across requirements, interfaces, and service boundaries.Delivered multiple high-impact initiatives including SWIFT (buyer fee), Partial Authorization, and Post-Order Editing — improving conversion, order recovery rate, and buyer experience.Lead technical execution on initiatives touching async workflows, data consistency, order state transitions, and system integration.Built internal AI-powered triage tool to reduce operational load and accelerate issue diagnosis across checkout and order processing domains.Mentor junior engineers, support architectural planning, and contribute to cross-team engineering culture.

Education

• University of Michigan

  MSE, Computer Vision

  2017 — 2019

• National Chiao Tung University

  Exchange student, Electrophysics

  2014 — 2015

• Southeast University

  Bachelor's degree, Electrical Engineering

  2013 — 2017