Staff Full Stack Engineer

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 the role:

As a Staff Full stack Engineer in eBay's Identity team, you will focus on developing and supporting Identity Services including Authentication, Authorization, Onboarding, User Management, Web Services Security, Device Fingerprinting, and Account Linking/Entity Resolution. Your work will involve implementing ID Federation protocols like OAuth and OpenId Connect. This role is crucial in maintaining the eBay platform, servicing hundreds of millions of users across both Desktop and Mobile. As a senior engineer, you'll take part throughout the product development lifecycle—from conceptual design to product launch—while working closely with Product Managers, Designers, and Architectural teams.

What you will accomplish:

• Build and manage Authentication and security products.
• Create high-performance, scalable real-time systems handling billions of transactions daily, ensuring 99.99% uptime.
• Design layered applications with UI, business functionality, and database access.
• Leverage expertise in BE, FE, JS, CSS, RDBMS, NoSQL, Cloud computing, Big Data, Search, Kafka, Machine Learning, and Information Retrieval.
• Develop innovative solutions addressing market needs.
• Estimate efforts, plan implementations, and execute rollouts.
• Participate in requirement/design meetings with PD/PM teams.
• Uphold engineering excellence in development.
• Adhere to Definition Of Done (DoD) for quality assurance.
• Conduct comprehensive code reviews.

What you will bring:

• Proficiency in Java and Java EE with expertise in web services such as SOAP, REST, and HTTP/XML and strong understanding of data structures, object-oriented programming, and design patterns.
• Bachelor’s degree in computer science with over 8+ of experience, or a master’s degree in computer science with 5+ years of hands-on experience in developing large-scale distributed systems.
• Familiarity with Node.js, Java, Scala, Oracle, MongoDB (or other NoSQL databases), REST, event sourcing, web sockets, HTML5, CSS3, JavaScript, Ajax, Spring MVC, and JQuery is highly preferred.
• Ability to define, design, and implement complex, scalable systems.
• Expertise with testing frameworks and libraries such as Jest, Mocha for unit and playwright for integration, and end-to-end testing.
• Strong team collaboration and communication skills.