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Orders are ingested, routed to the optimal fulfilment centre, picked, packed, labelled, and handed off to carriers — all driven by Kafka events and asynchronous microservices.\n\n## Documentation\n\n| Document | Description |\n|----------|-------------|\n| [PRD](docs/PRD-fulfillment-system.md) | Product requirements and business context |\n| [SDS](docs/SDS-fulfillment-system.md) | System design — architecture, data models, event contracts |\n| [Implementation Plan](docs/IMPLEMENTATION-PLAN.md) | 48-week phased delivery plan across 10 squads |\n| [Initial Thoughts](docs/initial-thoughts.md) | Early design notes and trade-offs |\n\n## High-level architecture\n\n```\nCustomer / OMS\n      │\n      ▼\n Kong Gateway\n      │\n      ▼\nOrder Ingestion ──► FC Router ──► Inventory Service\n                                        │\n                                   Wave Planner\n                                        │\n                                   Pick Engine\n                                        │\n                                  Pack Service ◄── (this repo, Sprint 5)\n                                        │\n                              Carrier \u0026 Tracking\n                                        │\n                                  [OrderShipped]\n```\n\n## Services\n\n| Service | Location | Language | Status |\n|---------|----------|----------|--------|\n| Pack Service | [services/pack-service](services/pack-service/) | Clojure | 🟡 In progress |\n\nMore services will be added here as each squad scaffolds their domain (see [Implementation Plan](docs/IMPLEMENTATION-PLAN.md)).\n\n## Tech stack\n\n| Concern | Technology |\n|---------|-----------|\n| Messaging | Apache Kafka 3.8 (KRaft) + Confluent Schema Registry |\n| Primary DB | ScyllaDB 6 (wide-row, low-latency) |\n| Cache | Valkey 8 (Redis-compatible) |\n| Search | OpenSearch 2.x |\n| Analytics | Apache Trino + MinIO |\n| Service mesh | Istio 1.23 (mTLS) |\n| API gateway | Kong Gateway OSS |\n| Observability | Prometheus 3 + Grafana 11 + Jaeger 2 + OpenTelemetry |\n| CI/CD | GitHub Actions + ArgoCD + Harbor |\n| Secrets | HashiCorp Vault |\n| Feature flags | Unleash |\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fprayagupa%2Ffulfillment-system","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fprayagupa%2Ffulfillment-system","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fprayagupa%2Ffulfillment-system/lists"}