Explore Domain Driven Design and Onion Architecture in Scala through this 50-minute conference talk from Scala Days New York 2016. Dive into key concepts like Ubiquitous Language, Bounded Contexts, and Domain Building Blocks. Learn how to create clean package structures and abstraction layers for portable, testable, and maintainable code. Follow along with a practical case study that demonstrates the implementation of Repositories, Services, Aggregates, and more. Discover techniques for rapidly prototyping domains using Scala's case classes and traits, and understand how to evolve your codebase effectively. Gain insights into decoupling domains, functional testing, and applying the Dependency Inversion Principle. Whether you're new to Domain Driven Design or looking to enhance your Scala development practices, this code-driven presentation offers valuable strategies for improving code readability and maintainability.