Shaokun Xie focused on backend development and code optimization across two repositories, skeletonlabs/skeleton and saleor/saleor. In skeletonlabs/skeleton, he enhanced the V3 migration script by introducing a guard in TypeScript to ensure replaceWithText only executed when necessary, reducing redundant operations and improving large-file processing performance. This optimization addressed CPU and IO bottlenecks, supporting more scalable migrations. In saleor/saleor, he resolved an issue with staff order confirmation emails by refactoring the notification handler and adding regression tests in Python, which improved reliability and test coverage. His work demonstrated depth in migration scripting, email notifications, and robust testing practices.