Annotation and highlighting tool

Built a browser-based annotation tool for internal use. Used to cleanly show and systematically mark up multi-page text in any file format — color-coding and tagging headlines, fact-checking information, and linking quotes to sources. Built with React, pdf.js, and a custom SVG overlay system handling cross-page arrow routing and annotation merging. Used regularly to produce structured datasets to test AI and algorithm-focused tools. Usable in mobile or web.