squbs: A New, Reactive Way for PayPal to Build Applications

Preface

It is not uncommon for services in PayPal to cover 1000 VMs or more. These services make use of very small VMs and produce very low throughput for each VM. At the same time, the large…

Spark in Flames — Profiling Spark Applications Using Flame Graphs

When your organization runs multiple jobs on a Spark cluster, resource utilization becomes a priority. Ideally, computations receive sufficient resources to complete in an acceptable time and release resources for…

Creating a Subscription Service with PayPal (Part 1 of 2): The Billing Plan

This is the first of a two part tutorial on creating a subscription model. Over the next two posts, we will cover everything you’ll need to get started with subscriptions using the PayPal REST APIs:

Statistics for Software

Software development begins as a quest for capability, doing what could not be done before. Once that what is…

From Big Data to Fast Data in Four Weeks or How Reactive Programming is Changing the World — Part 1

Part 1: Reactive Manifesto’s Invisible Hand

Creating a Subscription Service with PayPal (Part 2 of 2): The Billing Agreement

This is part 2 of creating a subscription service. This second step to creating a subscription for a user is to create and execute a billing agreement, based on an existing activated billing…

Lessons Learned from the Java Deserialization Bug

(with input from security researcher Mark Litchfield)

Introduction

At PayPal, the Secure Product LifeCycle (SPLC) is the assurance process to reduce and eliminate security vulnerabilities in…

Interning @ PayPal: Checkout A/B Testing, Developing Features, and Cracking Bugs

My internship at PayPal was a great experience. I was given real work that mattered. From day one, I had the opportunity to continuously write, commit, and push production level code that…