Hi, I’m Qingyang.

Shipped core calculator and assessment features for IXL’s iOS app, used by 1 in 4 K–12 students in the United States, with a focus on reliability and performance.

Lead infrastructure for CALICO, UC Berkeley’s high school programming contest, running on Google Cloud Platform with auto-scaling support for 2,000+ concurrent contestants.

Built a domain‑specific language for describing streaming data pipelines with GCP, making it easy for domain experts without infrastructure expertise to define, deploy, and evolve real-time jobs.

A real-time routing tracker for electric multiple unit trains, built in SwiftUI.

Created programming assessments for introductory UCSD CSE courses and maintained the automated grading infrastructure on Gradescope.

Contributed to the largest online programming learning platform in China.