Worked on the Maintainerr repository to enhance rule management functionality within the application, focusing on improving stability and flexibility for end users. Addressed edge cases in rule creation and section handling by implementing robust ID management for commits and removals, ensuring that invalid states were prevented during rule addition. Enabled safe deletion of the first rule in a section when other rules exist, updating section numbering and maintaining at least one available section for new rules. Utilized React for frontend development and leveraged both JavaScript and TypeScript to deliver these changes, resulting in a more reliable and user-friendly workflow.