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Kalle Sommer Nielsen is an experienced software developer and technical leader with a distinguished career spanning over 15 years. As a Core Developer and Release Manager for PHP 7 at PHP since January 2008, Kalle specializes in Windows builds and portability of the PHP language. Previous roles include Technical Lead and Lead Developer at Fixably from May 2020 to May 2024, and Founder of Tuxxedo Software Development, where Kalle created the Tuxxedo Engine framework. Positions held also include Senior Software Engineer at Trollweb Solutions, Lead Developer at Zesix Interactive, and Frontend Engineer at Danmarks Radio. Kalle's diverse experience encompasses both backend and frontend development, as well as team leadership roles across multiple projects and companies.