Developed and delivered a real-time spell checker for Markdown files within the apache/netbeans repository, focusing on enhancing the Markdown authoring experience in the NetBeans IDE. The work involved registering the Markdown MIME type and integrating a plain-text spellchecker directly into the editor, providing immediate feedback to users as they write documentation. Leveraging Java and plugin development skills, the implementation maintained clear separation from existing Markdown tooling, ensuring minimal disruption and improved maintainability. This targeted feature addressed the need for higher editor quality and reduced typographical errors, supporting more efficient Markdown-driven workflows without introducing regressions or complexity to the codebase.