Sebastian Doerner developed Textproto language support for the helix-editor/helix repository, focusing on enhancing the editing experience for Textproto files. He configured the languages.toml file to enable syntax highlighting, indentation rules, and text objects, ensuring seamless integration with existing editor workflows. By leveraging skills in configuration and language support, and working with SCM and TOML, Sebastian addressed the need for improved protobuf workflow compatibility. He also updated documentation to guide users in adopting the new features. The work was targeted, delivering a single, well-scoped feature that improved editing fidelity and reduced manual setup for developers working with Textproto files.