A Microsoft Office developer specializes in creating, modifying, and maintaining applications for the Microsoft Office suite. They leverage Office APIs and frameworks such as VSTO (Visual Studio Tools for Office) or Office JavaScript API to extend functionality, automate tasks, and integrate Office software with other applications. Their work may include developing add-ins for Word, Excel, or Outlook, creating custom macros, or building data-driven business solutions using SharePoint. They also ensure compatibility across different versions of Office and troubleshoot any issues. Their goal is to optimize the Office user experience and increase productivity.