Jax Desmarais-leder
Engineering Manager - Mobile (iOS Android) SDKs at PayPal
Oak Park, Illinois, United States
Summary
👤
Senior🎓
Top SchoolJax Desmarais-leder is an Engineering Manager who specializes in mobile SDKs for iOS and Android, currently leading PayPal’s teams that ship developer-friendly payments tooling used on millions of devices. Over nine years at PayPal/Braintree he progressed from support engineer to manager, pairing deep hands-on contributions—like converting critical iOS modules to Swift and shipping PayPal and 3D Secure features on Android—with technical leadership. He focuses on scalable architecture, clean documentation, and measurable reliability while mentoring engineers and aligning cross-functional strategy. Based in Oak Park, IL, Jax brings a pragmatic product sensibility rooted in customer-facing support work and a background in intensive coding education. Colleagues rely on him to turn complex payments requirements into elegant, testable SDKs that prioritize developer experience and security.
9 years of coding experience
10 years of employment as a software developer
Computer Science, Computer Science at Actualize Coding Bootcamp
Github Skills (12)
paypal10
javas10
objective-c10
3d-secure10
swift10
ios10
sdk10
mobile-development10
android10
java10
testing9
ui-customization9
Programming languages (6)
Github contributions (5)
braintree/braintree_ios
Dec 2021 - Jan 2023
Braintree SDK for iOS
Role in this project:
Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:1347 reviews, 166 commits, 551 PRs in 1 year 1 month
Contributions summary:Jax's commits primarily focused on converting the Objective-C AmericanExpress module to Swift, which involved rewriting .h and .m files into single .swift files and updating paths in the podspec. This included creating a new Swift file to house error types and making the rewards balance initializer private. The user also made updates to UI tests for new features, and also updated the test cases.
objective-cbraintree-ios-sdkin-app-purchasestorekitbraintree-sdk
braintree/braintree_android
Feb 2022 - Jan 2023
Braintree SDK for Android
Role in this project:Mobile Developer (Android)
Mobile Developer (Android)Contributions:580 reviews, 31 commits, 102 PRs in 11 months
Contributions summary:Jax primarily contributed to the Braintree Android SDK, focusing on implementing and updating features related to payment processing, specifically for PayPal and 3D Secure integrations. They added functionality to handle billing agreements within PayPal checkout requests, updated UI components for 3D Secure, and implemented UI customization options. Additionally, the user addressed code quality by removing jetifier and refactoring code to improve compatibility.
paymentsin-app-purchasecredit-cardbraintree-sdkandroid
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