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Learn how to escape monolithic factories in NestJS payment systems.
Based on my real 1-week refactor that turned crushing tech debt into clean, maintainable, modular code.
Includes ready-to-use patterns, templates, and hard-won lessons; plus the personal cost of that sprint (yes, eye twitch included 😅).

Whether you're maintaining a fintech backend or scaling a NestJS app, this book delivers battle-tested strategies to make your code cleaner, more extensible, and truly team-friendly.

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