Abstract: Calling the world's largest community of free open knowledge our customer, we’re developing software in one of the biggest and best known volunteer driven environments. This environment is highly diverse in the means of culture, language, preferences and requirements and provides new challenges for agile software development. Customer collaboration is pushed to a new level when agile processes need to deal with feedback from such a diverse community. In this talk we want to share our gained knowledge and experience about integrating and adapting agile workflows and processes to the challenges of diversity on different levels. Abraham and Tobias are both part of the software development team at Wikimedia Deutschland and involved in Wikidata, the largest open knowledge project, since the very beginning. They will share insights, lessons learned and best practices how to deal with agile development principles while respecting and integrating feedback and collaboration from the Wikimedia community, the world’s largest community dedicated to free knowledge, as their customer. = Learning Outcomes = * dealing with large volunteer communities in agile software development * respecting and integrating community feedback in agile processes * how to face high diversity in community driven projects at big scale * dealing with conflicts between full time employees (developers) and volunteer developers * transformation from a large project into a product into a software department driven by agile methods * how to succeed as a SCRUM Master (concerning agile principles) in such a challenging ecosystem