JBoss Enterprise Portal interface is fully customized with applications called portlets. Application development can be done by using the plain Portlet specification JSR-286 (refer to the "Portlet Primer" chapter in the EPP Reference Guide for more information), but it is also possible to use the JBoss Portlet Bridge to write applications with JSF and/or RichFaces and/or Seam, (refer to the "Getting started with JBoss Portlet Bridge" chapter of the EPP Reference Guide).

Depending on the complexity of the application and the familiarity of the team with JSF, one approach or the other can be the right choice for your team.