LLD Domain Modeling: How Real Systems Evolve Over Time (Versioning, Change & Refactoring Reality)

Short summary

An article arguing that domain models in low-level design must continuously evolve as business complexity grows, and that refactoring is not error correction but model correction. It covers symptoms of design drift, when to refactor, and how domain modeling helps contain change by isolating invariants and separating bounded contexts. The core message: good design is dynamic, not fixed — strength lies in safe adaptability, not perfect initial structure.

• •Domain models must evolve as business reality changes; no initial design is final
• •Refactoring is model correction, not error correction — refactor when rules scatter or contexts overlap
• •Good design prioritizes safe evolution and isolated impact of changes over perfect initial structure

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