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Rasmus Lerdorf is a distinguished engineer at Etsy since June 2008, with extensive experience in software development and architecture. Lerdorf has been involved with PHP since its inception in 1994, contributing to its ongoing development. Previous roles include advisor and developer at WePay from April 2010 to December 2017, focusing on architecture, API, OAuth, and fraud prevention, as well as advising Room 77 from June 2010 to 2017. At Yahoo! Inc. from September 2002 to November 2009, Lerdorf worked as a distinguished engineer on architecture and security issues while engaging in internal and external evangelism. Earlier experience includes serving as a senior research engineer at Linuxcare Inc. from January 2000 to April 2001. Lerdorf holds a Bachelor of Science degree in Systems Design Engineering from the University of Waterloo, completed in 1993.