SkillSet is a single-page browser application that transforms a JSONResume skills section into an interactive D3 force-directed graph. The user uploads a JSON file, the front-end parses the skills array (categories with keywords and proficiency levels), and D3 renders a node-link diagram where category nodes connect to keyword nodes, with edge thickness reflecting proficiency. The visualization supports drag, click to highlight nodes, and double-click to reset. The architecture is a classic static-site front-end: HTML loads three script tags (D3 library, core visualization logic in `viz.js`, and UI/business logic in `app.js`), with a modern-ish CSS layout using CSS custom properties and grid. A Webpack build step exists but the production deployment still uses the unbundled script approach. The code is functional and clean for a demo, but lacks modularity, tests, and error-handling sophistication. It is a straightforward, well-documented showcase of D3 force layout applied to a common resume format, suitable for portfolio demos but not for production reuse without significant refactoring.