Contributed to the zed-industries/zed repository by implementing per-file Vim and Emacs modeline support, enabling users to specify editor configurations directly within source files. The solution involved safe, bounded parsing of modelines by reading only the first and last kilobyte of each file, and leveraged Rust’s Arc for efficient management of modeline settings without unnecessary cloning. This work laid the foundation for future mode-to-language mapping and editorconfig-like features, while also updating documentation and release notes to reflect the changes. The contribution demonstrated skills in configuration management, editor development, and language parsing, with a focus on collaborative workflows and maintainability.