Weijen Liu worked on the onekey-sec/unblob repository, focusing on improving the reliability and security of its sandboxed extraction flow. Using Python and leveraging backend development and file system operations skills, Weijen addressed a recurring permission error by ensuring the extraction directory is created before any sandboxed extraction begins. This targeted fix involved pre-creating necessary filesystem paths, which reduced user-facing failures and stabilized the extraction process. The work demonstrated a careful approach to error handling and sandboxing, resulting in a more robust pipeline. Although the contribution was focused on a single bug fix, it addressed a core stability issue in production.