Derek Sun Email and Phone Number

Messenger Mobile Foundation (June 2023 - Present)WhatsApp Client Privacy (January 2023 - June 2023)Messenger Real-Time Communication (March 2018 - January 2023)

Edge on iOS (April 2017 - March 2018)• Lead architect of the v1 Microsoft Edge on iOS browser app• Implemented over 90% of the UI components in the app, prioritizing reusable and scalable design which maximizes code maintainability and extendability• Implemented the backbone navigation system of the app, which enables navigating among WebKit webview and custom native views, as well as persisting and restoring sessions• Improved layout and rendering performance of the browsing experience which matches the theoretical limit of WebKit’s rendering engineOffice for iOS and macOS (March 2014 - April 2017)• Key member in a small team (of 5) representing Microsoft to be featured at Apple’s WWDC during the Touch Bar announcement• Implemented document canvas foundational UI framework that is used across all Office apps on iOS • Drove the effort of cleaning up engineering debts with URL encoding, eliminating classes of bugs and significantly improving code maintainability• Designed and implemented an iOS app using Swift and Azure servicesthat enables engineers to remotely execute build commandsWindows Sustained Engineering (October 2012 - March 2014)• Engineered several UI components, server logics, and backend database for an internal ASP.NET web application• Wrote automated UI tests covering four operating system versions that reduced manual costs of testing the EU browser choice ballot by 90%• Serviced multiple Windows components and improved test reliabilities by testing code changes and fixing both manual and automated jobs

• Built and shipped an iOS app that rewards users for rating ads • Integrated with third-party frameworks including a Parse backend server,Facebook authentication, and Axwave audio matching SDK, etc

Designed and engineered a complex iPad utility application for the Film industry.Supervised and developed new teammate's skills and talents to increase productivity.

Windows Server Technologies

Enterprise Reporting and Visualization

Innovation and Prototyping