Custom GUI Development for Web App

I'm looking for a developer to contribute a small number of highly custom GUI elements to a web application using JavaScript and HTML. Your job will be to create buttons and other interactables which add, delete, reorder, and split array items. (The arrays are rendered currently as HTML tables.) Also complete code for recalculating/redrawing tables when values are edited or linked to other elements.

Ideal Skills and Experience:
- Proficiency in JavaScript and HTML
- Experience in developing custom GUI components
- Strong understanding of user interaction and experience design
- Ability to create dynamic and responsive web elements
- Ability to understand underlying program logic (unique application)

Please provide examples of similar work (preferably clickable and drag-and-drop HTML elements).