dev-philosophy

SOLID principles (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion) combined with design patterns like Factory, Repository, and Strategy create maintainable code. Apply them during module design to enforce small cohesive units, clear interfaces, and testability across your architecture layers.

Domain-driven design organizes software into distinct layers—Domain, Application, Infrastructure, and Presentation—with strict boundary enforcement and dependency direction. This separation isolates business logic, prevents tight coupling, and ensures each layer has a single responsibility aligned to its domain concern.

Hexagonal architecture isolates your core domain logic from external dependencies (databases, APIs, UI) through adapter ports. This design enables independent testing, easy dependency swapping, and clear contracts between layers, reducing technical debt and improving system flexibility.

Consistent naming conventions, exception handling standards, test structure discipline, and CI/CD alignment create predictable code. Regular refactoring toward these standards, combined with SOLID principles and design patterns, keeps codebases maintainable and reduces friction across teams.

Architectural patterns (layering, hexagonal design, separation of concerns) define system-wide structure and boundaries for large-scale organization. Design patterns (Factory, Repository, Strategy) solve localized implementation problems within those layers. Use architectural patterns first during system planning, then design patterns during component implementation.

Establish development philosophy standards covering layer boundaries, dependency direction, domain isolation, interface contracts, and exception handling. Apply these consistently from project planning through system design, implementation, and QA to achieve team alignment and reduce inconsistent practices.