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High-level principles and patterns for structuring software systems that translate requirements into modular, maintainable, and extensible designs.
Software design defines the structure, components and interactions of a system to satisfy functional and non-functional requirements. It captures decisions about modularity, interfaces and patterns and links requirements to implementation. Good design increases maintainability, scalability and supports long-term evolution through documented decisions and trade-offs.
Measures complexity of modules and helps identify complicated spots.
Number and density of dependencies between modules as an indicator of coupling.
Time required to get a requirement change into production.
DDD organizes models, boundaries and aggregates to make complexity in business domains manageable.
Versioned resources, HATEOAS principles and clear error codes support integration stability.
Layers and abstractions isolate business rules from details, improving testability and replaceability.
Perform requirements and context analysis.
Sketch candidates for components and interfaces.
Make and document design decisions using trade-off analyses.
Build prototypes, test and iteratively refine.