14. Capstone Project — Enterprise AI Platform

flowchart TD
    subgraph FRONTEND["Frontend Layer"]
        WEB["Web App\nNext.js + Tailwind"]
        ADMIN["Admin Dashboard\nUsage + Analytics"]
    end
    subgraph API["API Gateway"]
        GW["API Gateway\nKong / Envoy"]
        AUTH["Auth Service\nSSO + RBAC"]
        RATE["Rate Limiter\nPer-tenant"]
    end
    subgraph CORE["Core Services"]
        CHAT["Chat Service\nStreaming + History"]
        RAG["RAG Service\nMulti-source retrieval"]
        AGENT["Agent Service\nLangGraph workflows"]
        MCP_SVR["MCP Server\nTool integration"]
        FILE["File Service\nUpload + Processing"]
    end
    subgraph AI["AI Layer"]
        LLM_GW["LLM Gateway\nProvider routing"]
        EMBED["Embedding Service"]
        EVAL["Evaluation Service\nQuality scoring"]
    end
    subgraph DATA["Data Layer"]
        PG["PostgreSQL\n+ pgvector"]
        QDRANT["Qdrant\nVector store"]
        REDIS["Redis\nCache"]
        S3["Object Store"]
    end
    subgraph OPS["Operations"]
        PROM["Prometheus\nMetrics"]
        GRAFANA["Grafana\nDashboards"]
        LOKI["Loki\nLogs"]
        TEMPO["Tempo\nTraces"]
        ALERT["AlertManager"]
    end

    WEB --> GW
    ADMIN --> GW
    GW --> AUTH
    GW --> RATE
    GW --> CORE
    CORE --> AI
    CORE --> DATA
    CORE --> OPS

    style FRONTEND fill:#3b82f6,color:#fff
    style API fill:#ef4444,color:#fff
    style CORE fill:#8b5cf6,color:#fff
    style AI fill:#22c55e,color:#fff
    style DATA fill:#f59e0b,color:#fff
    style OPS fill:#6366f1,color:#fff

enterprise-ai-platform/
├── frontend/
│   ├── app/
│   │   ├── (auth)/
│   │   ├── dashboard/
│   │   ├── chat/
│   │   ├── admin/
│   │   └── evaluation/
│   ├── components/
│   └── lib/
├── backend/
│   ├── api/
│   ├── services/
│   │   ├── chat/
│   │   ├── rag/
│   │   ├── agents/
│   │   ├── mcp/
│   │   └── evaluation/
│   ├── models/
│   └── core/
│       ├── auth.py
│       ├── config.py
│       └── observability.py
├── ai/
│   ├── prompts/
│   ├── agents/
│   │   ├── research_agent/
│   │   └── support_agent/
│   ├── mcp/
│   │   ├── servers/
│   │   └── tools/
│   └── evaluation/
│       ├── golden_datasets/
│       └── evaluators/
├── infrastructure/
│   ├── terraform/
│   ├── k8s/
│   └── monitoring/
│       ├── prometheus/
│       ├── grafana/
│       └── loki/
├── deployment/
│   ├── Dockerfile
│   ├── docker-compose.yml
│   └── ci/
└── docs/
    ├── architecture.md
    ├── api.md
    └── security.md

flowchart TD
    subgraph PHASE1["Phase 1: Foundation (Week 1-2)"]
        P1A["Setup project structure"]
        P1B["Authentication + multi-tenancy"]
        P1C["Basic chat API with streaming"]
        P1D["Database schema + migrations"]
    end
    subgraph PHASE2["Phase 2: RAG (Week 3-4)"]
        P2A["Document ingestion pipeline"]
        P2B["Vector store + embeddings"]
        P2C["RAG retrieval + re-ranking"]
        P2D["Q&A with citations"]
    end
    subgraph PHASE3["Phase 3: Agents (Week 5-6)"]
        P3A["LangGraph agent framework"]
        P3B["Tool definitions + execution"]
        P3C["MCP server implementation"]
        P3D["Multi-agent coordination"]
    end
    subgraph PHASE4["Phase 4: Operations (Week 7-8)"]
        P4A["Monitoring + tracing"]
        P4B["Evaluation pipeline"]
        P4C["Admin dashboard"]
        P4D["CI/CD + deployment"]
    end

    PHASE1 --> PHASE2 --> PHASE3 --> PHASE4

    style PHASE1 fill:#3b82f6,color:#fff
    style PHASE2 fill:#22c55e,color:#fff
    style PHASE3 fill:#f59e0b,color:#fff
    style PHASE4 fill:#8b5cf6,color:#fff

flowchart TD
    subgraph TENANT_A["Tenant A"]
        DB_A["Database\nTenant A schema"]
        VS_A["Vector Store\nTenant A index"]
        CONFIG_A["Config\nTenant A settings"]
    end
    subgraph TENANT_B["Tenant B"]
        DB_B["Database\nTenant B schema"]
        VS_B["Vector Store\nTenant B index"]
        CONFIG_B["Config\nTenant B settings"]
    end
    subgraph SHARED["Shared Infrastructure"]
        LLM_GW["LLM Gateway"]
        MONITOR_SHARED["Monitoring"]
        CACHE_SHARED["Cache Cluster"]
    end

    TENANT_A --> LLM_GW
    TENANT_B --> LLM_GW
    TENANT_A --> MONITOR_SHARED
    TENANT_B --> MONITOR_SHARED

    style TENANT_A fill:#3b82f6,color:#fff
    style TENANT_B fill:#22c55e,color:#fff
    style SHARED fill:#f59e0b,color:#fff

flowchart TD
    subgraph CI["CI/CD Pipeline"]
        GIT["Git Push"] --> TEST["Tests + Eval"]
        TEST --> BUILD["Docker Build"]
        BUILD --> REGISTRY["Container Registry"]
    end
    subgraph K8S["Kubernetes Cluster"]
        subgraph PROD_NS["Production Namespace"]
            FE["Frontend\nHPA: 3-20 pods"]
            API["API\nHPA: 5-50 pods"]
            WORKERS["Workers\nHPA: 2-10 pods"]
        end
        subgraph OPS_NS["Observability"]
            PROM["Prometheus"]
            GRAFANA["Grafana"]
            LOKI["Loki"]
        end
    end
    subgraph DATA_SERVICES["Data Services"]
        RDS["RDS PostgreSQL"]
        ELASTICACHE["ElastiCache Redis"]
        QDRANT_CLOUD["Qdrant Cloud"]
    end

    REGISTRY --> K8S
    FE --> API
    API --> WORKERS
    API --> DATA_SERVICES
    API --> PROM

    style CI fill:#3b82f6,color:#fff
    style K8S fill:#22c55e,color:#fff
    style DATA_SERVICES fill:#f59e0b,color:#fff

flowchart LR
    subgraph TRACES["Tracing"]
        OTLP["OpenTelemetry\nAll services"]
        SPANS["Spans\nEvery LLM call"]
        EXPORT["Export to\nGrafana Tempo"]
    end
    subgraph METRICS["Metrics"]
        REQ["Requests/sec\nPer tenant"]
        LAT["Latency P50/P95/P99"]
        COST["Cost/request\nPer model"]
        TOKENS["Token usage\nInput + Output"]
    end
    subgraph LOGS["Logging"]
        STRUCT["Structured logs\nJSON format"]
        SEARCH["Full-text search\nGrafana Loki"]
        RETENTION["Retention\n30 days hot, 1 year cold"]
    end
    subgraph ALERTS["Alerting"]
        QUALITY["Quality drop\nAuto-rollback"]
        COST_SPIKE["Cost spike\n> 2x budget"]
        ERROR["Error rate\n> 5% in 5 min"]
        LATENCY["P95 latency\n> 5s"]
    end

    TRACES --> GRAFANA["Grafana\nDashboards"]
    METRICS --> GRAFANA
    LOGS --> GRAFANA
    ALERTS --> DUTY["PagerDuty\nOn-call"]

    style TRACES fill:#3b82f6,color:#fff
    style METRICS fill:#22c55e,color:#fff
    style LOGS fill:#f59e0b,color:#fff
    style ALERTS fill:#ef4444,color:#fff