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Willian Justen de Vasconcellos is an experienced software engineer with a focus on frontend development and teaching. Currently serving as a Staff Engineer and Tech Lead on the Mobile team at Appcues since March 2022, Willian is responsible for developing the Mobile Builder. As an instructor for Willian Justen Courses since May 2016, Willian has created highly-rated web development courses on Udemy, attracting over 250,000 students. Previously, Willian worked as a Senior Front-end Developer at Toptal, contributing to an exclusive network of top freelance developers, and held positions at Huge, Globo.com, WeDemand/Queremos, Maxisite Comunicação Digital, and as a Computer Teacher and Student Researcher early in the career. Academic credentials include a degree in Information Technology from Instituto Superior de Tecnologia and Industrial Chemistry from Universidade Federal Fluminense.