Reusing Login Code Across Projects Reveals Case for Centralized Auth Services

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Developers commonly build login and user management features from scratch or by duplicating code across multiple projects, a practice that creates long-term maintenance challenges. When a bug is found in one project's login system, the same flaw often exists in all copies, requiring repeated fixes across every codebase. As new projects introduce additional requirements — such as role management — those features remain siloed rather than benefiting all applications. This pattern of fragmented, copy-pasted authentication logic highlights the inefficiency of project-by-project auth development. The scenario makes a case for centralizing authentication and user management into a shared, reusable service instead of rebuilding it each time.

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