Qcrao worked on two core features across the scroll-tech/scroll and raycast/extensions repositories, focusing on performance and workflow improvements. For scroll-tech/scroll, he optimized the chunk proposer by pre-allocating the chunk blocks slice in Go, reducing memory reallocations and increasing throughput for better maintainability. In raycast/extensions, he developed the Raycast Markdown Styler Extension using TypeScript, JavaScript, and CSS, enabling Markdown-to-styled-HTML conversion with inline CSS, browser-based previews, and one-click copy functionality. His work addressed content editor needs by streamlining HTML rendering and sharing within Raycast, demonstrating depth in both back-end performance tuning and front-end extension development.