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Unlocking the Power of JunoDB: PayPal’s Key-Value Store Goes Open-Source

JunoDB is a distributed key-value store that plays a critical role in powering PayPal’s diverse range of applications. Virtually every core back-end service at PayPal relies on JunoDB, from login to risk to final transaction processing. With JunoDB, applications can efficiently store and cache data for fast access and load reduction on relational databases and other services. However, JunoDB is not just another NoSQL solution. It was built specifically to address the unique needs of PayPal, delivering security, consistency, and high availability with low latency, all while scaling to handle hundreds of thousands of connections. While other NoSQL solutions may perform well in certain use-cases, JunoDB is unmatched when it comes to meeting PayPal’s extreme scale, security, and availability needs. From the ground up, JunoDB was designed to be cost-effective, ensuring that PayPal can maintain its high standards of quality and operational excellence while keeping costs manageable.

Building a Customizable Messaging Platform

Communication is an important part of human life. It helps resolve issues quickly, get answers to our questions and simply exchange ideas.

Caching Dynamic Content at the Edge

PayPal Upstream PayLater messages inform customers about financing opportunities to purchase products from t-shirts to treadmills. In addition to notifying customers of a safe and secure pay later option, these messages can increase merchants’ conversion and average order values. There is much upside for consumers and merchant customers in a small piece of HTML.

Delivering messages to customers may seem simple; however, at internet-scale, delivering messages to millions of consumers worldwide on thousands of merchant sites requires skilled engineering and sophisticated infrastructure. In addition to delivering the correct message to the proper merchant at the right time, PayPal’s merchant customers demand delivery of these messages at a ludicrous speed.

The next generation of Data Platforms is the Data Mesh

As enterprises become more agile, centralization appears more and more as a thing of the past world, a waterfall world. The same appears to be true with data platforms. Therefore, we are building a Data Mesh, this next generation of data platforms for PayPal Credit. This post details the evolution of data platforms, highlights their problems, and why we decided to build a Data Mesh. I will detail the four principles of the Data Mesh, how to get started, look at the architecture, and describe some of the challenges.

Refactoring and Optimizing a High Traffic API at PayPal

We defined Latency as network latency plus application request processing time. With our focus on optimizing the application request processing time, 3 parameters were chosen to define performance:

  • Average latency
  • 95th percentile
  • 99th percentile

Words All the Way Down — Conversational Sentiment Analysis

Explore challenges, methodologies and datasets around conversational sentiments and learn how PayPal analyses customer sentiment.

The art of automating automation

Improving business efficiency through automation.

Designing for Accessibility: How Text Resizing Works in Different Web Browsers

Have you heard that 33% of mobile users have text size adjustment enabled on their phones? According to this excellent research by Q42 conducted among more than 1 million Dutch users, many mobile users require text resizing in order to properly read on their mobile devices. While this large survey was conducted specifically in the Netherlands, the data are similar to what is observed across other countries around the world. Therefore, ensuring quality text resizing is vital for approximately one third of your users.

How PayPal Uses Real-time Graph Database and Graph Analysis to Fight Fraud

Prevent organized and repeat fraudsters by using a home-grown graph platform.

Using Documentation-Driven Design to Guide API Decisions

As software design evolves, so do the thought processes behind the design decisions we make as engineers. Some of these development practices are widely known and talked about, such as Test-Driven Design, where changes to code are made in programmatic tests before they’re implemented in actual business logic.

These design practices are helpful for our future selves and for our teammates, because they help us keep our code well-maintained and easily extendable. How do these practices help external audiences, or audiences that aren’t as technical, understand our code? When designing a new API or making impactful changes to an existing API, a Documentation-Driven Design approach can be helpful in guiding the design decisions you make, too.

Building Data Quality into the Enterprise Data Lake

How a team at PayPal built a tool to define, manage, control, and deploy rulesets for the data quality framework.

Machine Learning Model CI/CD and Shadow Platform

Deploying large-scale fraud detection machine learning models at PayPal.

An Innovative Way to Predict Continuous Variables: From Regression to Classification

When it comes to the prediction of continuous variables, the first thing that comes to our mind is always the regression model. For instance, linear regression is the most commonly used regression model, and it has the benefits of simple implementation and high interpretability. On the other hand, random forest regression can handle missing data and is adaptive to interactions and nonlinearity. While these algorithms all work well for continuous target variables in different scenarios analytically, they provide less information on the predicted numbers’ confidence level, especially in real-world applications.

In this article, we will explore an unconventional framework to predict continuous variables with given confidence scores. Instead of framing the prediction as a regression problem, we twist the problem into a classification problem. This framework also allows us to have more visibility on the predicted results and can be adjustable to different confidence levels. The article will use revenue estimation as an example. Given a variety of business attributes for many businesses, we will illustrate how we can predict the revenue for each business given a specific confidence level.

Cross-Selling Optimization Using Deep Learning

Many impactful business problems need to be translated into corresponding machine learning tasks. For example, we must be able to recognize fraudulent credit card transactions to prevent loss for both our merchants and consumers. Credit card fraud detection is often translated to a classification task in machine learning.

Recommending the right financial products to the right customers is another important problem. One way to tackle product recommendation is by computing a propensity score (i.e. the likelihood of adopting a product for a user). Effective product recommendations and promotional strategies are often built based on product propensity scores. Propensity modeling, which determines the best product-customer pairs, is often translated into a classification task.

Using Machine Learning to Improve Payment Authorization Rate

When our customers make purchases with credit or debit cards in their PayPal wallet, we send the payment details through card networks to card issuing banks for payment authorization. During this process, payments can be declined by the issuing banks for various reasons, such as the card: exceeding its credit limit, not having enough balance, being reported as stolen, or outdated information(see here for more information regarding issuer declines causes).

Apart from these reasons, issuers also consider many other factors when deciding to approve or decline a payment request, such as: what type of card is being used for the payment? What merchandise is being purchased? What time is the payment request submitted? What is the card’s approval and decline history from issuers?

Text Resizing - Flexible Components for Improved Accessibility

Text resizing is the ability for the user to adjust their preferred font size in their device’s operating system preferences. A variety of users make this adjustment to improve their ability to read small text on a small screen. Once this setting is adjusted, the platform and any apps that have built-in support for this feature will resize displayed text. Check out these examples of how to adjust these text and font resizing settings in Android and iOS platforms. Pro tip: If you don’t already use these settings, grab your phone and try it right now. As we all know, it’s good to put yourself in your customer’s shoes. Plus it’ll be good practice because most of us will find the feature helpful eventually.

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