This book is for any developer that feels like their code gets worse instead of better over time. What you’re reading is a handbook that teaches professional software developers tThis book has two goals. The first is show you the common unknown unknowns of software design and architecture from clean code to micro-services and from object design to Domain-Driven Design. The second part is to present you with the most influential ideas and practical, actionable wisdom from the phronimos — our teachers— on how write testable, flexible, maintainable code.