Explore the principles of writing clean, maintainable code in this 50-minute Devoxx conference talk. Delve into essential guidelines, code smells, and refactoring techniques that form the foundation of professional software development. Learn to introspect your design and express thoughts clearly in code, while discussing core principles like DRY, SRP, DIP, and KISS. Discover how to write expressive code that's a pleasure to work with, including tips for using Java 8 lambdas and streams. Benefit from the speaker's extensive experience as a Java craftsman and trainer, delivered in an entertaining style with real-world analogies and examples. Whether you're a beginner or experienced developer, gain valuable insights to improve your coding practices and coach others effectively.