This presentation will begin with a discussion of the overall features and benefits of Perl/Mason and the challenges encountered in developing a large-scale B2B site in Perl. Following this introduction, the project requirements will be discussed and the rationale behind the choice of Perl/Mason as the implementation language described. We will discuss the high-level technical design of the site and the integration of the various technologies necessary to build a site of this magnitude. Our experiences in porting an existing Web-based application from PHP to Perl/Mason will be presented, paying particular attention to the reasons for doing so and the obstacles encountered in the process.