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How 4wp.dev Applied SOLID Principles Across Its WordPress Plugin Catalog

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Developer platform 4wp.dev has published a self-assessment examining how its WordPress plugin catalog measures up against the five SOLID software design principles. The team structured its product line as separate plugins — including 4WP-Booking, 4WP-FAQ, 4WP Smart Link, and others — each with a distinct purpose, sharing only infrastructure through a shared bundle rather than features. 4WP-Booking was architected around a provider contract from the outset, allowing new booking integrations like Google Calendar or Calendly to be added as extensions without modifying core booking logic. The FAQ plugin separates data storage from display, with each front-end block consuming only the data it needs rather than relying on a single bloated interface. The writeup positions SOLID not as abstract theory but as practical habits already aligned with how WordPress developers use hooks, filters, and custom post types.

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