Why SOLID Principles Alone Are Not Enough for Complex Software Design

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A DEV Community article series on Low-Level Design argues that while SOLID principles help engineers build well-structured individual classes, they do not address how those classes collaborate at scale. As software systems grow, new design challenges emerge around object creation, algorithm selection, inter-component communication, and extensibility. The author uses a city-planning analogy to illustrate that designing good individual buildings does not automatically produce a functional city — the connections between them matter equally. Design Patterns, the article contends, exist specifically to solve these structural and collaborative problems that SOLID leaves unanswered. The piece serves as an introduction to a mini-series that will explore why Design Patterns were created and how they complement object-oriented principles.

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