Data Platform - Experimentation & Evaluation

Created an app for Chinese as a 2nd language learners.

https://play.google.com/store/apps/details?id=com.zhiyong.tingxie

https://apps.apple.com/us/app/%E5%90%AC%E5%86%99-chinese-spelling-dictation/id6462944919

The app have been downloaded over 1000 times. Active installs tend to hover between 150-200.

Featured in an online newsletter in 2022.

https://www.littledayout.com/we-tried-three-parent-review-of-3-ting-xie-apps/#:~:text=Apps-,%E5%90%AC%E5%86%99%20App%20%28Google%20Play%20only%29

Check out our Instagram and Facebook.

https://www.instagram.com/tingxiechinese/

http://facebook.com/profile.php?id=100069794723668

Backend in Scala Play. I wanted to try something different, and was interested in functional programming then. I initially tried Haskell Yesod but decided to go with Scala Play.

Mobile app was initially in native Android Java, then started to code new components in Kotlin; I then rewrote the whole app in React Native for both Android and iOS. I also implemented Python scripts for various OCR (Optical Character Recognition) jobs, using OCR libraries such as pytesseract, easyOCR and Google's Document AI. Lastly, I have an internal React web app for managing the app's content.

Manage of a full stack team of 7 engineers and 1 UX designer across 5 countries, and informally manage 2-3 QA engineers.

Working together with backend and machine learning teams to mold and realize the vision of personalized PayPal user experiences. Lead design and development of UI for an internal web application for creation and analytics of personalization campaigns, and contribute to frontend development in React and backend development in Java.

Collaboration with multiple engineering teams on user-friendly internal tools for creation of cross-platform components, that can be created once and used across PayPal's Android, iOS, and web apps; these tools are synergistic with our personalization tools.