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eBay Tech Blog

To support the world’s largest internet marketplace, eBay tackles technical challenges at a scale that few others have. With this blog, we share our experiences working on those challenges with the technical community.


The Web Push Checklist

By: Senthil Padmanabhan

eCommerce sites are ideal candidates for push notifications and eBay is no exception. Timely notifications can help users track the status of items that they have purchased or watching or bidding, without effectively being on the site. But we are also aware that push notifications can end up being a double-edged sword. At eBay, we recently launched web push notifications for a subset of desktop users and want to share that experience.


Large-Scale Product Image Recognition with Cloud TPUs

By: Shuai (Kyle) Zheng

Customers all over the world use eBay to buy and sell all kinds of products. With more than one billion product listings on eBay, it is essential for eBay to use cutting-edge AI to help everyone find the products that they want. And visual search is increasingly important—with cameras on every smartphone, eBay customers want to be able to snap a photo to find exactly what they see.


Managing HTTP Header Size on NetScaler Load Balancers

By: Charles Li

The way that the NetScaler load balancer handles oversized HTTP header is not quite straightforward when combined with layer 7 policies and may result in unexpected consequences and bad user experiences if overlooked. This article explains how the header limit works and offers our recommendations on how to manage it properly.


Event Sourcing in Action with eBay's Continuous Delivery Team (Part 2)

By: John Long and Nataraj Sundar

In our first article, we introduced the concept and some of the benefits of event sourcing. For this article, we are going to get very specific about how we implemented event sourcing for the Enterprise Continuous Delivery (ECD) project here at eBay.


Event Sourcing: Connecting the Dots for a Better Future (Part 1)

By: John Long and Nataraj Sundar

Using an Event-centric approach has enabled our team at eBay to scale to handle millions of events with the resiliency to recover from failures as quickly and reliably as possible. Though similar approaches have been widely adopted to augment large-scale data applications, for eBay's Continuous Delivery team, Event Sourcing is at the heart of decision-making and application development. To that end, we've built a system that continuously scales and tests our ability to handle an increasing volume of events and an ever growing list of external data sources and partner integrations.


Your Own Spring Test Context

By: Tony Da Silva Bernardino

When applications become big and complex, we are presented with a whole new set of challenges. As engineers, we have to find ways to overcome them. Read how we addressed one of those challenges: Spring integration tests performance.


Optimization Study on Processing Order of NetScaler Load Balancer Layer 7 Policies

By: Charles Li, John Yang and Leona Zhang

Traffic on is processed by thousands of layer 7 policies on the load balancers. Clearly understanding the processing order ensures availability (by avoiding misconfigurations) and performance (by prioritizing the policies efficiently).


GUI Testing Powered by Deep Learning

By: Honghao Wang, Sovan Rath and Yotam Sharan

Deep Learning (DL) is revolutionizing the face of many industries these days, such as computer vision, natural language processing, and machine translation, and it penetrates many science-driven products and technological companies, including eBay. These days, DL is taking its first strides in eBay’s Quality Engineering (QE) space, and it has already proven to outperform the best test veteran and industry-grade applications one could find.


Integration Testing with React and Enzyme

By: Matthew Wood

As a React application grows, it is important to ensure that all the components continue to work together. Using Enzyme, we created an integration testing framework that tests a React application in its entirety, without relying on a server. The result was a lightning fast integration test suite that gives us high confidence that the critical paths of our application are always working.


How Developers Power eBay’s Product-Based Shopping Experience

By: Curtis Gavin

eBay is moving towards a Product-Based Shopping Experience (PBSE) in 2018. With the new experience, buyers will be able to easily find merchandise that meets their search criteria and quickly decide which products they want to purchase.


Altus Care: Applying a Chatbot to eBay Platform Engineering

By: Alison Shu

eBay developers recently combined several commonly used technologies, including Lucene search and the Stanford Natural Language Processor, to create Altus Care, a chatbot that provides an instant one-stop support solution for internal eBay Altus users.


Stepping Towards a Password-Free World

By: Ashok Balasubramanian

eBay Identity has taken an ambitious goal of killing passwords for eBay users once for all. However, killing passwords is not a trivial task, as users have been using passwords as a primary authentication mechanism to access e-commerce and financial websites over the past 20+ years.

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