During August 2025, Shyharenko Slava established the foundational frontend architecture for the MarneyDude/404_not_found repository, focusing on rapid and scalable development. They set up a React application scaffold using Vite, integrating ESLint and PostCSS for code quality and build optimization. A structured SCSS architecture was implemented to support consistent and maintainable UI components. To streamline early-stage development, Shyharenko removed strict code style enforcement by deleting the EditorConfig file, reducing friction for contributors. Their work, primarily in JavaScript, SCSS, and HTML, provided a flexible base for future features while balancing code quality with the need for fast iteration.