Xiang worked on enhancing Python interpreter startup configuration across the facebook/buck2 and facebook/buck2-prelude repositories, focusing on deployment reliability and runtime flexibility. He implemented interpreter flag-based runtime configuration by adding support for passing CLI arguments through PAR bootstrap tooling, replacing environment variable controls with explicit interpreter flags to improve subprocess compatibility. His work involved Python development, build system configuration, and scripting, ensuring consistent runtime behavior across platforms like Linux, macOS, and Windows. By aligning configuration mechanisms and plumbing runtime arguments end-to-end, Xiang addressed cross-repository consistency and enabled more robust, configurable deployments, demonstrating depth in environment management and build tooling.