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    "title": "Backend Development (Library)",
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    "article": "\n# Backend Development\n\n## Overview\n\nBackend Development is a specialization focused on building robust, maintainable backend services, APIs, and domain-driven systems. It covers the full spectrum of server-side engineering: from designing clean domain models and hexagonal architectures to implementing test-driven workflows that deliver sub-second feedback.\n\nThis specialization emphasizes practices that produce well-structured, evolvable systems — where tests drive design, infrastructure is deferred, and domain logic stays isolated from external concerns.\n\n## Key Focus Areas\n\n- **Domain-Driven Design** — Organizing code around bounded contexts, entities, and value objects that speak the language of the business\n- **Hexagonal Architecture** — Keeping domain logic independent from I/O concerns via ports and adapters\n- **Outside-In TDD** — Driving feature development from acceptance tests inward, letting design emerge from working code\n- **Fast Feedback** — Sub-second test suites using in-memory fakes, enabling confident refactoring at any time\n\n## Available Skills\n\n| Skill | Description |\n|-------|-------------|\n| [growing-outside-in-systems](skills/growing-outside-in-systems/) | Outside-In TDD with Hexagonal Architecture — drives feature development from acceptance tests inward, with emergent design and in-memory fakes |\n\n## When to Use This Specialization\n\nApply backend-development skills when:\n- Building new APIs, microservices, or backend features\n- Structuring domain models and bounded contexts\n- Setting up test infrastructure for a backend service\n- Refactoring toward cleaner architecture with confidence\n",
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