A XSL-FO developer is responsible for creating and maintaining Extensible Stylesheet Language (XSL) style sheets that are used to transform XML documents into PDFs or other formats. The developer must have a strong understanding of both XML and XSLT, as well as experience working with FO processors such as Apache FOP or Antennahouse Formatter. In addition, the developer should be familiar with common PDF post-processing tools such as Ghostscript or Adobe Acrobat.