An XML developer is a software developer who creates programs or applications using XML. XML is a markup language that describes data and how the data is structured. XML can be applied to most any file type, such as word processing documents, images, audio and video clips, spreadsheets, and web pages.XML developers help streamline the sharing processes for web-based documents. They define XML rules to improve the entire process. XML developers also offer adequate backend support to organizations. Apply to XML Developer jobs if you're a candidate looking for a job. XML supports information exchange between computer systems such as websites, databases, and third-party applications. Predefined rules make it easy to transmit data as XML files over any network because the recipient can use those rules to read the data accurately and efficiently.