XML Feeds to Indeed, Trovit Jooble and other

For my jobboard site (self-hosted Wordpress-site) I would like to create a custom XML feed (or 5) to post my jobs to Indeed, Trovit , caeerjet and Jooble and general xml . For more information about the feeds see: Indeed: [login to view URL] Trovit: [login to view URL] Caeerjet Jooble: [login to view URL] And XML General Xml I need the xml includes jobs of the past 30 days, and every time I published a new employment is included in the xml. It needs to be functional and does not generate a lot of queries in the database only necessary to create the xml.