Software Engineer, CX Platform

At eBay, we're more than a global ecommerce leader — we’re changing the way the world shops and sells. Our platform empowers millions of buyers and sellers in more than 190 markets around the world. We’re committed to pushing boundaries and leaving our mark as we reinvent the future of ecommerce for enthusiasts. Our customers are our compass, authenticity thrives, bold ideas are welcome, and everyone can bring their unique selves to work — every day. We're in this together, sustaining the future of our customers, our company, and our planet. Join a team of passionate thinkers, innovators, and dreamers — and help us connect people and build communities to create economic opportunity for all. About the Team and Role: TCGplayer connects hobbyists and hobby businesses to communities. We relentlessly improve the exchange of things and thoughts that fuel passions, providing the most compelling destination and tools for collectible card game enthusiasts and professional sellers! TCGplayer, now a part of eBay, promotes and drives growth of our products and services by connecting a global community of millions of buyers with tens of thousands of retailers in a $25B global collectible hobby market. As a Software Engineer III, you will help design, build, and maintain the systems that power TCGplayer's Customer Experience (CX) platform. Your work will enable our CX agents to efficiently support both Buyers and Sellers across every aspect of TCGplayer's business. You will uplift legacy applications into a microservice-based architecture, integrate with internal systems of record and third-party ticketing and AI systems, and collaborate closely with other development teams to deliver a cohesive and intuitive customer support experience. Build and deliver AI-powered features for a modern CX platform by developing LLM-based services, automation workflows, and intelligent APIs. Contribute to migration from .Net (C#) to a Python-based AI-native architecture. What you will accomplish: Develop AI-powered backend services and APIs using Python Build LLM-based solutions including RAG pipelines and retrieval systems Implement CX use cases like summarization, recommendations, and automation Integrate AI services with existing systems and APIs Optimize performance, latency, and cost of AI solutions Ensure production readiness with logging, monitoring, and testing Develop MCP, enterprise-grade agentic AI workflows, and a range of modern AI solutions What you will bring: 4+ years of strong experience in Python; C#/Java knowledge is a plus Experience with LLM APIs, prompt engineering, and basic RAG concepts Hands-on with frameworks like LangChain, LlamaIndex, or similar API development (FastAPI/Flask) and microservices Basic cloud experience (AWS / Azure / GCP) Familiarity with Docker, CI/CD, Terraform. Relational DB: PostgreSQL, MySQL NoSQL: MongoDB (good to have) Vector DBs: Pinecone, FAISS, Weaviate, or pgvector (basic experience) Search: Elasticsearch (basic experience) Bachelor’s/Master’s in Computer Science or related field Experience building or integrating AI/ML solutions in production Experience in CX / support tools is a plus Exposure to evaluation and monitoring of AI systems is a plus Understanding of cloud-native development is a plus Additional Details eBay is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, sex, sexual orientation, gender identity, veteran status, and disability, or other legally protected status. If you have a need that requires accommodation, please contact us at  talent@ebay.com . We will make every effort to respond to your request for accommodation as soon as possible. View our accessibility statement to learn more about eBay's commitment to ensuring digital accessibility for people with disabilities.   We use cookies to enhance your experience and may use AI tools for administrative tasks in the hiring process. To learn how we handle your personal data and use AI responsibly, please visit our   Talent Privacy Notice , Privacy Center , and AI Hiring Guidelines .