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Architecture Overview

The Keller Postman platform is a multi-tenant, event-driven system built on Azure. It follows Domain-Driven Design with bounded contexts, CQRS, and an outbox pattern for reliable event delivery.

High-Level Topology​

Frontend (React / Azure SWA)
        ↓
BFF Layer (.NET / Azure Container Apps)
        ↓
GraphQL Gateway (composition reads)
        ↓
Domain APIs (.NET / Azure Container Apps)
        ↓
Azure Service Bus (Dapr pub/sub)
        ↓
Azure SQL / Cosmos DB

Key Design Decisions​

  • Bounded contexts — each domain service owns its data and emits integration events; it never directly queries another service's database
  • Outbox pattern — domain events are persisted in the same transaction as the aggregate, then published asynchronously by a Quartz job
  • Multi-tenancy — tenant ID is resolved from HTTP headers and applied as a global query filter in EF Core
  • Auth — Azure AD (backend services) and Auth0 (BFF/frontend)

Service Map​

This page is a stub. A full architecture diagram and per-service breakdown will be added here.