Package by feature as the outer layer, then organize each feature into subdirectories for api/, domain/, and infrastructure/. Keep domain/ free of Spring annotations. Use IDs for cross-domain communication instead of object imports to maintain loose coupling. Default to package-private access modifiers and promote to public only when necessary. Leverage Java 21 records and sealed interfaces for better type safety and immutability. This structure requires initial setup but saves time as the codebase grows.
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Ali NematiWritten by Ali
