Explore Mattermost's innovative approach to layered extensibility in open source software development through this insightful 32-minute conference talk presented by Corey Hulen from Mattermost at a Linux Foundation event. Gain valuable insights into how Mattermost implements a flexible and scalable architecture that allows for easy customization and integration. Learn about the principles and strategies behind their layered approach, which enables developers to extend and modify the platform to meet specific organizational needs while maintaining the core functionality. Discover the benefits of this methodology for both developers and end-users, and understand how it contributes to the overall success and adaptability of open source projects in today's rapidly evolving technological landscape.