Senior Backend Engineer - MTS 1

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.

We are reinventing advertising at eBay! As a Senior Backend Engineer in the Ads team, you will work closely with designers, product managers and other engineers (frontend, backend, native, machine learning, quality) to redefine the advertising space for eBay and beyond. We are innovating rapidly in the ad-tech space and there is no shortage of new challenges for motivated individuals. Our goal is to create a valuable experience for both buyers and sellers, while also driving performance through Ads Learn About Our Work: eBay Advertising Insights: eBay Advertising Promoted Listings on eBay: eBay Seller Center - Promoted Listings Job Responsibilities: Design new experiences for eBay sellers and advertisers to promote their products, manage their advertising campaigns, and run their businesses Develop highly available, scalable RESTful APIs and event-driven systems processing billions of ad-serving and bidding events with strict latency and reliability requirements Develop systems using Java/Scala, Spring Boot, and Node.js across our microservices architecture Implement well-designed backend services following established architectural patterns, and contribute to design documents and technical reviews with peers and senior engineers. Understand and apply trade-offs in system design (consistency, availability, latency, cost) within your service area Leverage AI-assisted development tools (e.g., GitHub Copilot, Claude Code) throughout the development lifecycle for coding, debugging, testing, and code review to increase engineering velocity Contribute to AI-powered advertising features by collaborating with ML engineers on LLM integrations, recommendation systems, and intelligent campaign optimization Evaluate and adopt new technologies—including AI-assisted tools—to improve system quality and engineering velocity. Operate within our internal open source community where we share a variety of projects and codebases Develop, test, and deploy services through automated CI/CD pipelines with a focus on reliability and observability Work effectively within a fast-paced, Agile team, adapting to evolving priorities and delivering iterative value to customers Contribute to technical conversations and debates, and decide upon approaches and tools to apply Job Requirements:

BS/BA in Computer Science or related field with 7+ years of experience, or MS with 5+ years Backend Strong experience in Java (17+) and building services with Spring Boot or similar frameworks Experience building scalable backend systems and RESTful APIs in distributed environments Experience with event-driven architectures and message queues (Kafka, RabbitMQ, or similar) Experience with relational (Oracle/Postgres/MySQL) and/or NoSQL (Cassandra/MongoDB) databases, including schema design and query optimization System Design & Core Skills Strong system design experience for distributed, high-traffic applications (able to lead a 45-min system design interview) Ability to reason about system design trade-offs (e.g., consistency vs availability, sync vs async) Proven computer science fundamentals (data structures, algorithms) Other / Tools & Practices Experience with CI/CD tools (Jenkins, GitHub Actions) Strong ownership mentality with