Promoted from intern to full-time on the payments platform — Angular frontend, PHP and Python backend, SQL.

Resolved payment-gateway bugs dropping thousands of transactions a day, authored technical specs, and shipped across the stack.

Designed and delivered introductory Python workshops to 240 students and conducted 50 oral assessments.

Contributed a new SwiftUI interface in Youdao Dictionary (100M+ MAU) and reusable UIKit components for the Hi Echo speaking-coach app.

Streamlined weekly email reports and SQL pipeline updates with Python, saving hours of manual work each week.