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          "rationale": null,
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        {
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        "rationale": "Structural patterns for organizing product code into maintainable modules, layers, and feature boundaries. Full stack engineers need this to keep cross-layer feature work understandable as the product grows.",
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        "slug": "d_init_01",
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      "input_skill": "Relational Databases",
      "llm_role": null,
      "roles_from_db": []
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    {
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          "rationale": null,
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          "slug": "ionic-developer",
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          "slug": "backend-engineer",
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    {
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        "rationale": "Client-side integration with backend endpoints and third-party services, including request shaping, response handling, and synchronization with UI state. This is central to frontend work because most screens depend on remote data.",
        "slug": "api-integration-and-data-fetching",
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    },
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        "slug": "api-interface-and-contract-design",
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          "display_name": "Go Backend Developer",
          "id": 81,
          "rationale": null,
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          "slug": "go-backend-developer",
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        {
          "display_name": "Kotlin Backend Developer",
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          "rationale": null,
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          "slug": "kotlin-server-backend-developer",
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          "rationale": null,
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          "rationale": null,
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        },
        {
          "display_name": "Python Backend Developer",
          "id": 80,
          "rationale": null,
          "role_archetype": "Engineering",
          "slug": "python-backend-developer",
          "source": "db"
        },
        {
          "display_name": "Ruby Backend Developer",
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          "rationale": null,
          "role_archetype": "Engineering",
          "slug": "ruby-backend-developer",
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        {
          "display_name": "Scala Backend Developer",
          "id": 87,
          "rationale": null,
          "role_archetype": "Engineering",
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    },
    {
      "dimension": {
        "difficulty_hint": "well_known",
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        "id": 11,
        "rationale": "Techniques for improving throughput, latency, and resource efficiency in PHP backend services. This includes profiling, query optimization, concurrency limits, memory use, and bottleneck analysis.",
        "slug": "performance-and-scalability-tuning",
        "source": "db"
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      "input_skill": "Pagination",
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        {
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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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          "display_name": "Node.js Backend Developer",
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          "rationale": null,
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          "rationale": null,
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          "display_name": "Python Backend Developer",
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          "rationale": null,
          "role_archetype": "Engineering",
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        }
      ]
    },
    {
      "dimension": {
        "difficulty_hint": "well_known",
        "display_name": "REST API Implementation",
        "id": 280,
        "rationale": "Designing and implementing service endpoints, request/response shapes, and HTTP behavior in Java services. This cluster covers the mechanics of building reliable backend APIs rather than broader contract governance.",
        "slug": "rest-api-implementation",
        "source": "db"
      },
      "input_skill": "Pagination",
      "llm_role": null,
      "roles_from_db": [
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          "display_name": "Java Backend Developer",
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          "rationale": null,
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        }
      ]
    },
    {
      "dimension": {
        "difficulty_hint": "well_known",
        "display_name": "Testing and Verification",
        "id": 284,
        "rationale": "Automated checks used to validate Java backend behavior across unit, integration, and service boundaries. This cluster covers test design, fixtures, mocks, and regression coverage for backend changes.",
        "slug": "testing-and-verification",
        "source": "db"
      },
      "input_skill": "RSpec",
      "llm_role": null,
      "roles_from_db": [
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          "display_name": "Go Backend Developer",
          "id": 81,
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