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Jose Valim is the lead developer and co-founder of Plataforma Tec. He started working with Ruby and Rails in late 2006 and was invited to be part of the Rails Core Team in 2010 after his work on Rails 3 development. He's also author and maintainer of various other well-known open source projects that led him to receive a Ruby Hero award in recognition for his contributions to the community. Lately, he's been flying around the globe giving talks and courses about Ruby and Rails.