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          "rationale": null,
          "role_archetype": "Engineering",
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          "role_archetype": "A Backend Engineer designs, builds, and maintains the server-side logic and data handling that power applications and services. They focus on implementing reliable business functionality, integrating with other systems, and ensuring the backend is scalable, maintainable, and observable.",
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          "rationale": null,
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          "display_name": "Java Backend Developer",
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          "rationale": null,
          "role_archetype": "Engineering",
          "slug": "java-backend-developer",
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          "rationale": null,
          "role_archetype": "Engineering",
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          "display_name": "Node.js Backend Developer",
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          "display_name": "PHP Backend Developer",
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          "rationale": null,
          "role_archetype": "Engineering",
          "slug": "php-backend-developer",
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          "display_name": "Python Backend Developer",
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          "rationale": null,
          "role_archetype": "Engineering",
          "slug": "python-backend-developer",
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          "display_name": "Ruby Backend Developer",
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          "rationale": null,
          "role_archetype": "Engineering",
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        "display_name": "React Frontend Development",
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        "rationale": "Building interactive web user interfaces with React.js, including component composition, state management, hooks, and rendering patterns. React.js belongs here because it is a core library for client-side UI development in modern web applications.",
        "slug": "d_init_01",
        "source": "db"
      },
      "input_skill": "Unit Testing",
      "llm_role": null,
      "roles_from_db": []
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    {
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        "difficulty_hint": "well_known",
        "display_name": "Testing and Defect Resolution",
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