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Ultimate Domain-Driven Design on Azure: production-grade .NET service demonstrating CQRS, transactional outbox, Cosmos DB change feed projections, and event-driven integration via Service Bus. Includes Clean Architecture, best practices, App Configuration, and Key Vault integration.

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# Order Management < -- > Azure Cosmos DB Conf 2026 talk source code

> This repository contains the **source code of my international talk** at **Azure Cosmos DB Conf 2026**, where I was a speaker.  
> I prepared this real-world example to demonstrate how to build **high-scale, event-driven systems** using **Azure Cosmos DB**, and to highlight the power of Cosmos DB features like **transactional batch**, **change feed**, and partition-aware modeling.

The solution exposes an HTTP API for placing, shipping, and cancelling orders, with **customer-centric** and **operations-centric** read models.

The **Order Bounded Context** in this sample is responsible for:

- Placing new orders (writes to the aggregate store and outbox in one transactional batch)
- Cancelling and shipping existing orders
- Querying order summaries by customer (`order-summaries`, partition key `/customerId`)
- Querying operations lists by tenant, status, and month (`order-ops-index`, partition key `/opsPartitionKey` = `tenantId|status|yyyy-MM`)

This README follows the same high-level structure as [the-real-DDD-CQRS-CleanArchitecture](https://github.com/TuralSuleymani/the-real-DDD-CQRS-CleanArchitecture) (Basket API): features, architecture overview, interaction flows, DDD notes, patterns, tech stack, getting started, project layout, and usage examples.

---

## Table of Contents

- [Features](#features)
- [Clean Architecture Overview](#clean-architecture-overview)
- [Interaction Flow in DDD and Clean Architecture](#interaction-flow-in-ddd-and-clean-architecture)
- [Domain-Driven Design Principles and Patterns](#domain-driven-design-principles-and-patterns)
- [Design Patterns Used](#design-patterns-used)
- [Technologies Used](#technologies-used)
- [Getting Started](#getting-started)
  - [Prerequisites](#prerequisites)
  - [Azure Cosmos DB: databases and containers](#azure-cosmos-db-databases-and-containers)
  - [Configuration (appsettings and user secrets)](#configuration-appsettings-and-user-secrets)
  - [Run the API and Worker](#run-the-api-and-worker)
- [Project Structure](#project-structure)
- [Usage: payloads and responses](#usage-payloads-and-responses)
- [Watch and Learn](#watch-and-learn)
- [About the author](#about-the-author)
- [Contributing](#contributing)
- [License](#license)

---

## Features

- **Order lifecycle**: Place, cancel, and mark shipped (`Placed`, `Shipped`, `Cancelled`).
- **Clean Architecture**: Domain, Application, Infrastructure, API, and a separate **Worker** host for background processors.
- **CQRS**: Commands via **MediatR** (`ICommand` / handlers with **FluentValidation** pipeline behaviour).
- **Result pattern**: Expected failures use `UnitResult<DomainError>` (**CSharpFunctionalExtensions**) instead of control-flow exceptions for business and persistence errors.
- **Domain events** → **integration events**: Application layer maps domain events to integration payloads; infrastructure persists an **outbox** in Cosmos and the Worker publishes to **Azure Service Bus** (or logs if no connection string is set).
- **Transactional outbox**: Order document and outbox records are written in the **same partition** (`/tenantId`) using a transactional batch.
- **Read models**: **Change feed** projectors maintain `order-summaries` and `order-ops-index` for low-latency queries aligned to different access patterns.
- **Integration audit**: Optional Cosmos-backed audit log (`integration-log`, PK `/tenantId`).

---

## Clean Architecture Overview

**OrderManagement** is structured around **Clean Architecture**:

1. **Domain layer** (`VOEConsulting.Flame.OrderManagement.Domain`):
   - Aggregate root: `Order`.
   - Domain events: e.g. `OrderPlacedEvent`, `OrderCancelledEvent`, `OrderShippedEvent`.
   - Smart enums: `OrderStatus`.
   - Value objects: `Money` + `Currency` for monetary arithmetic and multi-currency safety.
   - Shared primitives live in `VOEConsulting.Flame.Domain.Common` (`Entity<T>`, `AggregateRoot<T>`, `Id<T>`, `DomainError`, `ErrorType`, MediatR abstractions).

2. **Application layer** (`VOEConsulting.Flame.OrderManagement.Application`):
   - Commands: `PlaceOrder`, `CancelOrder`, `MarkShipped` with validators and handlers (shared orchestration via `OrderCommandHandlerBase`).
   - Queries: `IOrderSummaryQuery`, `IOpsOrderQuery` with DTOs.
   - Integration event contracts and mapping from domain events.

3. **Infrastructure layer** (`VOEConsulting.Flame.OrderManagement.Infrastructure`):
   - Cosmos DB repositories, outbox, change feed hosted services, Service Bus publisher, optional audit logger.

4. **API layer** (`VOEConsulting.Flame.OrderManagement.Api`):
   - Minimal APIs; dispatches commands through `ISender`; maps `DomainError` to HTTP results.

5. **Worker** (`VOEConsulting.Flame.OrderManagement.Worker`):
   - **Outbox dispatcher** (`IIntegrationEventPublisher`, `IIntegrationAuditLogger`, `IOutboxProcessedMarker`).
   - **Order summary projector** and **ops list projector** (read-model builders).

---

## Interaction Flow in DDD and Clean Architecture

### Write path

The diagram below shows a **command** that changes state: HTTP request → MediatR → command handler → domain → repository → Cosmos **transactional batch** (aggregate + outbox). Publishing to Service Bus happens **asynchronously** in the Worker when the change feed processes new outbox rows.

```mermaid
sequenceDiagram
    participant Client
    participant Api as OrderManagement.Api
    participant MediatR
    participant Validator as FluentValidation
    participant Handler as OrderCommandHandlerBase
    participant Domain as Order (aggregate)
    participant Repo as IOrderRepository
    participant Cosmos as Cosmos DB (orders, PK /tenantId)
    participant CFP as OutboxChangeFeedHostedService
    participant Pub as IIntegrationEventPublisher
    participant Audit as IIntegrationAuditLogger
    participant Marker as IOutboxProcessedMarker

Client->>Api: HTTP POST command (e.g. PlaceOrder)
    Api->>MediatR: ISender.Send(command)
    MediatR->>Validator: ValidationPipelineBehaviour
    Validator-->>MediatR: ok or throw ValidationException
    MediatR->>Handler: Handle
    Handler->>Domain: Load / mutate / collect domain events
    Handler->>Repo: SaveAsync(aggregate)
    Repo->>Cosmos: Transactional batch (Order doc + Outbox docs)
    Cosmos-->>Repo: success / precondition failed
    Repo-->>Handler: UnitResult DomainError
    Handler-->>MediatR: Result
    MediatR-->>Api: Result
    Api-->>Client: 201 / 204 / 4xx mapped from DomainError

Note over Cosmos,CFP: Async pipeline (Worker process)
    Cosmos->>CFP: Change feed (new/updated items)
    CFP->>CFP: Deserialize outbox payload
    CFP->>Pub: Publish integration event
    CFP->>Audit: Log published event (if configured)
    CFP->>Marker: Mark outbox row processed
    CFP->>Cosmos: Patch outbox state
```

### Read path

Reads **do not** hit the aggregate container directly for list/detail summaries. The **order-summaries** and **order-ops-index** containers are populated by **change feed projectors** running in the Worker, so read APIs see **eventually consistent** projected documents.

```mermaid
sequenceDiagram
    participant Client
    participant Api as OrderManagement.Api
    participant SumQ as IOrderSummaryQuery
    participant OpsQ as IOpsOrderQuery
    participant SumC as Cosmos order-summaries (PK /customerId)
    participant OpsC as Cosmos order-ops-index (PK /opsPartitionKey)
    participant Orders as Cosmos orders (PK /tenantId)
    participant P1 as OrderSummaryProjectorHostedService
    participant P2 as OpsOrderListProjectorHostedService

Note over Orders,P2: Worker: projectors keep read models in sync
    Orders->>P1: Change feed
    P1->>SumC: Upsert OrderSummary documents
    Orders->>P2: Change feed
    P2->>OpsC: Upsert OpsOrderList (opsPartitionKey = tenantId|status|yyyy-MM)

Client->>Api: GET /customers/{customerId}/orders
    Api->>SumQ: ListByCustomerAsync(customerId)
    SumQ->>SumC: Query (partition scoped)
    SumC-->>SumQ: OrderSummary rows
    SumQ-->>Api: OrderSummaryDto list
    Api-->>Client: 200 JSON array

Client->>Api: GET /customers/{customerId}/orders/{orderId}
    Api->>SumQ: GetAsync(customerId, orderId)
    SumQ->>SumC: ReadItem (id + partition key)
    SumC-->>SumQ: document or 404
    SumQ-->>Api: OrderSummaryDto or null
    Api-->>Client: 200 or 404

Client->>Api: GET /tenants/{tenantId}/ops/orders?status=&yearMonth=
    Api->>OpsQ: ListByStatusMonthAsync(tenantId, status, yearMonth)
    OpsQ->>OpsC: Query with PartitionKey = tenantId|status|yyyy-MM
    OpsC-->>OpsQ: OpsOrderList rows
    OpsQ-->>Api: OpsOrderDto list
    Api-->>Client: 200 JSON array
```

---

## Domain-Driven Design Principles and Patterns

1. **Entities / aggregates**: `Order` is the aggregate root; identity is `Id<Order>`.
2. **Value objects**: `Money`, `Currency`, `MoneyBreakdown`, `Percentage` encapsulate invariants and currency-safe arithmetic.
3. **Domain events**: Implement `IDomainEvent`; raised inside the aggregate and cleared after successful persistence.
4. **Repositories**: `IOrderRepository` abstracts load/save; infrastructure maps documents and uses **optimistic concurrency** (ETag) where applicable.
5. **Factories**: Aggregate creation is centralized (e.g., `Order.PlaceNew(...)`) so invariants and event-raising happen in one place.
6. **Ubiquitous language**: Order, place, cancel, ship, tenant, customer, outbox, integration event.
7. **Bounded context**: Order management is isolated; shared kernel is `VOEConsulting.Flame.Domain.Common`.

---

## Design Patterns Used

| Pattern | Role in this solution |
|--------|------------------------|
| **Adapter** | Infrastructure repositories and queries adapt external services (Cosmos SDK/Service Bus) to application interfaces (`IOrderRepository`, `IOrderSummaryQuery`, `IOpsOrderQuery`). |
| **Anti-corruption / mapping** | Domain events → integration events; Cosmos documents ↔ domain aggregates and read models. |
| **Builder** | `WebApplicationBuilder` / `HostApplicationBuilder` compose configuration and services; Cosmos transactional batch (`CreateTransactionalBatch`) builds multi-operation atomic writes; hosting helpers (`OrderManagementAzureAppConfiguration`, `AddOrderManagementPersistence`) assemble cross-cutting setup. |
| **Chain of responsibility** | MediatR behaviors (e.g., `ValidationPipelineBehaviour`) and the MediatR pipeline run requests through a chain of processing steps before the command handler runs. |
| **Change feed processor** | Multiple background processors use leases in `leases` and independently project/publish (outbox dispatcher, summaries projector, ops projector). |
| **Command** | Explicit command types (`PlaceOrderCommand`, `CancelOrderCommand`, `MarkShippedCommand`) encapsulate requests; handlers perform the operation—this is the **command** side of **CQRS**. |
| **CQRS** | Commands change state; queries read dedicated Cosmos containers / DTOs. |
| **Dependency Injection** | Composition root in `Program.cs` wires abstractions to implementations, enabling testability and replaceability. |
| **Facade** | Infrastructure hosting module (`Infrastructure/Hosting`) and `CosmosClient`/`Container` provide a simpler surface over App Configuration, Key Vault resolution, and low-level Cosmos REST/SDK details; minimal APIs group HTTP concerns behind small endpoint modules. |
| **Factory method** | Creation methods like `Money.Create(...)`, `Currency.Create(...)`, `MoneyBreakdown.Create(...)`, and `Order.PlaceNew(...)` centralize invariants and construction. |
| **Iterator** | Cosmos SDK `GetItemQueryIterator` / feed iteration; enumerating change-feed batches in hosted services walks sequences without exposing Cosmos internals to domain code. |
| **Mediator** | next level abstraction over existing types |
| **Observer** | Aggregates collect **domain events** (`RaiseDomainEvent`, `PopDomainEvents`); integration publishing reacts after persistence. Change feed processors **observe** container writes and react (projectors, outbox dispatcher). Complements **Publisher / Subscriber** for cross-boundary messaging. |
| **Options pattern** | Hosted services bind options (`OutboxChangeFeedOptions`, projector options) from configuration for clean separation of config and behavior. |
| **Publisher / Subscriber** | Integration events are published via `IIntegrationEventPublisher`; consumers subscribe externally (in Kafka/Service Bus ecosystems). In this repo the transport is Service Bus (Kafka would be another publisher strategy). |
| **Repository** | `IOrderRepository` abstracts aggregate load/save; `CosmosOrderRepository` implements persistence and transactional outbox batching behind that interface. |
| **Result** | `Result` / `UnitResult<DomainError>` for explicit expected failures (no exception-driven business flow). |
| **Singleton** | Most infrastructure services are registered as singletons (`AddSingleton`) and reused across the app lifetime (Cosmos client/containers, publishers, query services). |
| **State** | `OrderStatus` (e.g., Placed, Cancelled, Shipped) models aggregate lifecycle; `Order` methods enforce valid transitions (only placed orders may cancel or ship). |
| **Strategy** | Pluggable implementations via DI (e.g., `IIntegrationEventPublisher`, `IIntegrationAuditLogger`, `IOutboxProcessedMarker`, query interfaces). Selecting Service Bus vs logging publisher is a runtime strategy choice. |
| **Template method** | `OrderCommandHandlerBase<TCommand>` defines the command workflow skeleton; concrete handlers override only the use-case-specific step. |
| **Transactional outbox** | Atomic write of business data and messages; reliable publishing via change feed. |

---

## Technologies Used

- **C#** and **.NET 10**
- **ASP.NET Core** (minimal APIs)
- **Azure Cosmos DB** (SQL API)
- **Azure Service Bus** (optional for integration publishing)
- **MediatR**, **FluentValidation**
- **CSharpFunctionalExtensions**
- **Azure.Messaging.ServiceBus**, **Microsoft.Azure.Cosmos**

---

## Getting Started

### Prerequisites

- [.NET 10 SDK](https://dotnet.microsoft.com/download)
- An **Azure Cosmos DB** account (SQL API) — or the [Cosmos DB Emulator](https://learn.microsoft.com/azure/cosmos-db/emulator) for local development
- (Optional) **Azure Service Bus** namespace and queue (or topic) if you want real message publishing instead of the logging stub

### Azure Cosmos DB: databases and containers

1. In the [Azure Portal](https://portal.azure.com), open your Cosmos DB account (API: **Core (SQL)**).
2. Create a database (default name in code: **`orders-db`**). You can use **shared** database throughput or provision throughput per container.
3. Create the following **containers** with these **partition key paths** and **suggested** IDs (names must match configuration if you keep defaults):

| Container ID | Partition key | Purpose |
|--------------|---------------|---------|
| `orders` | `/tenantId` | Order aggregate documents and **outbox** items (same partition for transactional batch). |
| `order-summaries` | `/customerId` | Projected read model for customer APIs. |
| `order-ops-index` | `/opsPartitionKey` | Projected ops list; key value = `tenantId|status|yyyy-MM`. |
| `leases` | `/id` | Change feed lease store (default for the Cosmos DB change feed processor). |
| `integration-log` | `/tenantId` | Optional audit of published integration events. |

4. Under **Keys**, copy the **Primary Connection String** for configuration.

**Note:** Container throughput: for development, **400 RU/s** per container (or shared at database level) is often enough; tune for your load in production.

### Configuration (Azure App Configuration + Key Vault)

This solution is designed to keep **all relevant configuration** in **Azure App Configuration**, and store secrets in **Azure Key Vault** (referenced from App Configuration). Both the API and Worker load configuration at startup using `DefaultAzureCredential`.

**Bootstrap settings (local only)** live in `appsettings.json` and are intentionally minimal:

- `AppConfig:Endpoint` or `AppConfig:ConnectionString`
- `AppConfig:SentinelKey` (used for refresh)
- Non-secret defaults (container names, processor names, etc.)

Everything else (Cosmos connection string, Service Bus connection string, etc.) should come from App Configuration / Key Vault.

#### App Configuration keys (recommended)

Store these keys in **Azure App Configuration** (optionally label them with your environment name, e.g. `Development`, `Staging`, `Production`):

- `Cosmos:ConnectionString` (**secret** → use **Key Vault reference**)
- `Cosmos:DatabaseName` (e.g. `orders-db`)
- `Cosmos:OrdersContainer` (e.g. `orders`)
- `Cosmos:OrderSummariesContainer` (e.g. `order-summaries`)
- `Cosmos:OrderOpsContainer` (e.g. `order-ops-index`)
- `Cosmos:LeaseContainer` (e.g. `leases`)
- `Cosmos:IntegrationAuditContainer` (e.g. `integration-log` or empty to disable)
- `Cosmos:ChangeFeed:ProcessorName` / `Cosmos:ChangeFeed:InstanceName`
- `Cosmos:OrderSummaryFeed:ProcessorName` / `Cosmos:OrderSummaryFeed:InstanceName`
- `Cosmos:OpsOrderFeed:ProcessorName` / `Cosmos:OpsOrderFeed:InstanceName`
- `ServiceBus:ConnectionString` (**secret** → use **Key Vault reference**, optional)
- `ServiceBus:QueueOrTopicName` (e.g. `orders-integration`)
- `Settings:Sentinel` (any value; used as a refresh sentinel)

#### Azure Key Vault

Create secrets in Key Vault, for example:

- `Cosmos--ConnectionString`
- `ServiceBus--ConnectionString`

Then, in **Azure App Configuration**, create **Key Vault references** for:

- `Cosmos:ConnectionString`
- `ServiceBus:ConnectionString`

#### Local development (recommended)

Use **User Secrets** only to bootstrap connectivity to App Configuration (not to store your Cosmos/ServiceBus secrets directly):

```bash
dotnet user-secrets init --project src/VOEConsulting.Flame.OrderManagement.Api
dotnet user-secrets set "AppConfig:Endpoint" "<your-app-config-endpoint-url>" --project src/VOEConsulting.Flame.OrderManagement.Api

dotnet user-secrets init --project src/VOEConsulting.Flame.OrderManagement.Worker
dotnet user-secrets set "AppConfig:Endpoint" "<your-app-config-endpoint-url>" --project src/VOEConsulting.Flame.OrderManagement.Worker
```

Make sure you are authenticated for `DefaultAzureCredential` (e.g. `az login`) and your identity has access to App Configuration and Key Vault.

### Run the API and Worker

Run **both** processes: the API serves HTTP; the Worker runs change feed processors (outbox dispatch, summary projection, ops projection).

**Terminal 1 — API** (default HTTP URL from `launchSettings.json`: `http://localhost:5062`):

```bash
dotnet run --project src/VOEConsulting.Flame.OrderManagement.Api
```

**Terminal 2 — Worker**:

```bash
dotnet run --project src/VOEConsulting.Flame.OrderManagement.Worker
```

Build the full solution:

```bash
dotnet build OrderManagement.sln
```

---

## Project Structure

```
├── OrderManagement.sln
├── src/
│   ├── VOEConsulting.Flame.Domain.Common/          # Shared DDD primitives (Entity, Id, Result errors, ICommand/IQuery)
│   ├── VOEConsulting.Flame.OrderManagement.Domain/
│   ├── VOEConsulting.Flame.OrderManagement.Application/
│   ├── VOEConsulting.Flame.OrderManagement.Infrastructure/
│   ├── VOEConsulting.Flame.OrderManagement.Api/
│   └── VOEConsulting.Flame.OrderManagement.Worker/
└── README.md
```

---

## Usage: payloads and responses

JSON uses **camelCase** property names by default. Replace GUIDs and IDs with your own values.

### Write: place an order

The domain models money as value objects (`Money`, `Currency`) and persists a pricing breakdown:

\[
\text{Total} = \text{Subtotal} - \text{Discount} + \text{Tax}
\]

**Request**

`POST /orders`

`Content-Type: application/json`

```json
{
  "tenantId": "tenant-001",
  "orderId": "550e8400-e29b-41d4-a716-446655440000",
  "customerId": "cust-123",
  "subtotalAmount": 180.00,
  "discountAmount": 10.00,
  "taxAmount": 29.99,
  "totalAmount": 199.99,
  "currency": "USD"
}
```

**Responses**

- **201 Created** — body echoes the main fields; `Location` header points to the customer order resource.

```http
HTTP/1.1 201 Created
Location: /customers/cust-123/orders/550e8400-e29b-41d4-a716-446655440000
```

- **409 Conflict** — duplicate `orderId` in the same tenant, or optimistic concurrency failure on update.

- **400 Bad Request** — business rule failure mapped to `DomainError.BadRequest`:

```json
{
  "error": "Invalid request or parameters."
}
```

(Exact `error` text depends on the message returned from the domain/application layer.)

- **500** — unhandled failures; **FluentValidation** failures currently throw `ValidationException` before the handler (consider adding exception middleware to map to 400 in production).

---

### Write: cancel an order

**Request**

`POST /tenants/{tenantId}/orders/{orderId}/cancel`

No body.

**Responses**

- **204 No Content** — success.

- **404 Not Found** — order does not exist for that tenant.

- **400 Bad Request** — e.g. order is not in `Placed` state:

```json
{
  "error": "Only placed orders can be cancelled."
}
```

- **409 Conflict** — Cosmos concurrency / precondition failure when saving.

---

### Write: mark shipped

**Request**

`POST /tenants/{tenantId}/orders/{orderId}/ship`

No body.

**Responses**

- **204 No Content** — success.

- **404** / **400** / **409** — same semantics as cancel (400 when the order is not `Placed`).

---

### Read: list orders for a customer

**Request**

`GET /customers/{customerId}/orders`

Example: `GET http://localhost:5062/customers/cust-123/orders`

**Response 200 OK**

Array of summaries (after the **Worker** projector has processed the change feed — may be **empty or stale** for a short interval after a write):

```json
[
  {
    "orderId": "550e8400-e29b-41d4-a716-446655440000",
    "customerId": "cust-123",
    "tenantId": "tenant-001",
    "status": "Placed",
    "updatedAt": "2026-04-06T12:00:00+00:00",
    "placedAt": "2026-04-06T12:00:00+00:00"
  }
]
```

`status` is one of: `Placed`, `Shipped`, `Cancelled`.

---

### Read: get one order summary for a customer

**Request**

`GET /customers/{customerId}/orders/{orderId}`

**Response 200 OK**

```json
{
  "orderId": "550e8400-e29b-41d4-a716-446655440000",
  "customerId": "cust-123",
  "tenantId": "tenant-001",
  "status": "Placed",
  "updatedAt": "2026-04-06T12:00:00+00:00",
  "placedAt": "2026-04-06T12:00:00+00:00"
}
```

**Response 404 Not Found** — no projected document yet, or unknown id.

---

### Read: operations list by tenant, status, and month

**Request**

`GET /tenants/{tenantId}/ops/orders?status={status}&yearMonth={yyyy-MM}`

Both query parameters are **required** (case-sensitive names as in code: `status`, `yearMonth`).

Example:

`GET http://localhost:5062/tenants/tenant-001/ops/orders?status=Placed&yearMonth=2026-04`

**Response 200 OK**

```json
[
  {
    "orderId": "550e8400-e29b-41d4-a716-446655440000",
    "tenantId": "tenant-001",
    "customerId": "cust-123",
    "status": "Placed",
    "yearMonth": "2026-04",
    "opsPartitionKey": "tenant-001|Placed|2026-04",
    "placedAt": "2026-04-06T12:00:00+00:00",
    "updatedAt": "2026-04-06T12:00:00+00:00"
  }
]
```

**Response 400 Bad Request** — missing `status` or `yearMonth`:

```json
{
  "error": "Query parameters status and yearMonth (yyyy-MM) are required."
}
```

---

## 🎥 Watch and Learn

To better understand Domain-Driven Design (DDD), Clean Architecture, and the concepts mentioned in this repository, check out these related videos from my YouTube channel:

1. **Video explanation of current github repo with details!**  
   
   [![Watch on YouTube](https://raw.githubusercontent.com/TuralSuleymani/production-ready-DDD-EDA-Azure/main/images/me_on_git_project.gif)](https://youtu.be/TjoNaJ7n4Vg?si=bSOvy9E6wEO4-wGV)  
   *Learn more about current github repository; I'm explanation DDD(Domain-driven Design) and Clean Architecture behind this github project.*

2. **Podcast with Robert C. Martin: The Creator of Clean Architecture and SOLID Principles**  
   
   [![Watch on YouTube](https://raw.githubusercontent.com/TuralSuleymani/production-ready-DDD-EDA-Azure/main/images/me_and_robert_c_martin.gif)](https://youtu.be/xNgXAQjICpQ?si=HbPefWtLg4F2vzqC)  
   *In this episode, I sit down with Robert C. Martin (Uncle Bob), the legendary author of Clean Code and Clean Architecture and creator of the SOLID principles, to explore Object-Oriented Programming, software design, and the future of development.*

3. **Podcast with Mads Torgersen: The Man Behind the C# Language**  
   
   [![Watch on YouTube](https://raw.githubusercontent.com/TuralSuleymani/production-ready-DDD-EDA-Azure/main/images/me_and_mads_torgersen.gif)](https://youtu.be/2OSc8saeekM?si=Dy51ukYgJxOu016i)  
   *Explore the evolution of C#, its features, and its application in modern software development with the Lead Designer of C# language and of course, with me :).*

4. **Podcast with Rebecca Wirfs-Brock: The Creator of Responsibility-Driven Design**  
   
   [![Watch on YouTube](https://raw.githubusercontent.com/TuralSuleymani/production-ready-DDD-EDA-Azure/main/images/me_and_rebecca_wirfs_brock.gif)](https://youtu.be/Oi1UOnCfxJo?si=WgYza3vulLrbXJE4)  
   *In this podcast, I had the privilege to host legendary Rebecca Wirfs-Brock, where we discussed about Domain-Driven Design, Responsibility-driven design, and design heuristics.*

5. **A Deep Dive into Architecture, Functional Programming, and Dependency Injection with Mark Seemann**  
   
   [![Watch on YouTube](https://raw.githubusercontent.com/TuralSuleymani/production-ready-DDD-EDA-Azure/main/images/me_and_mark_seemann.gif)](https://youtu.be/aBtMvQdb3vs?si=tHbKd6ME72I-AVmz)  
   *In this episode, I chat with renowned software architect Mark Seemann about modern software development, covering topics like well-designed architecture, Dependency Injection, and functional programming.*

6. **An Elegant Introduction to Domain-Driven Design (DDD) and Its Patterns**  
   
   [![Watch on YouTube](https://raw.githubusercontent.com/TuralSuleymani/production-ready-DDD-EDA-Azure/main/images/me_on_domain-driven-design.gif)](https://youtu.be/aBtMvQdb3vs?si=tHbKd6ME72I-AVmz)  
   *My speech at Software Architecture Conference, where I provided an overview of DDD principles, their patterns, and how they can be applied in real-world projects.*

7. **Functional programming in C# with Railway-Oriented Programming**  
   
   [![Watch on YouTube](https://raw.githubusercontent.com/TuralSuleymani/production-ready-DDD-EDA-Azure/main/images/me_on_functional_programming.gif)](https://youtu.be/Pq4XLWxt-T8?si=pjzKQd1u9T9OJjX4)  
      *A detailed explanation of Functional Programming in C#, its use cases,values, and implementation using Railway-Oriented programming*

8. **Master the Result Pattern: The One Video You Must Watch**  
   
   [![Watch on YouTube](https://raw.githubusercontent.com/TuralSuleymani/production-ready-DDD-EDA-Azure/main/images/me_on_result_pattern.gif)](https://youtu.be/Pq4XLWxt-T8?si=pjzKQd1u9T9OJjX4)  
   *A detailed explanation of the Result pattern, its use cases, and implementation in C# projects.*

---

## About the author

Author of the book [Hands-on Microservices with JavaScript](https://www.packtpub.com/) published by Packt

Author of the [Apache Kafka for Distributed Systems](https://www.udemy.com/course/apache-kafka-for-distributed-systems) course on Udemy

Creator of a [TuralSuleymaniTech youtube channel](https://www.youtube.com/@turalsuleymanitech) with 12K+ subscribers, where I host discussions with leading figures in software engineering such as Robert C. Martin, Grady Booch, Bertrand Meyer,Mads Torgersen, Jon Skeet,  Rebecca Wirfs-Brock, Mark Seemann and others

[2x Microsoft MVP](https://mvp.microsoft.com/en-US/MVP/profile/03714279-cac2-4e47-8b00-a57f71efc528) in C# and Web Technologies (the first and the only from my country)

3x [C# Corner MVP](https://www.c-sharpcorner.com/members/tural-suleymani)

Public speaker at multiple international conferences, including [Microsoft](https://developer.azurecosmosdb.com/speakers/) and [C# Corner](https://youtu.be/aBtMvQdb3vs?si=sllWQq_AVcxMkAB2) events.

Open-source contributor with publicly available projects on [GitHub](https://github.com/TuralSuleymani/)

Trained 500+ students, many of whom now work at leading companies, major banks and insurance companies.

Holder of [multiple Microsoft certifications](https://www.credly.com/users/tural-suleymani/badges#credly), including MCP, MCSA, and MCSD

I'm a [Microsoft Certified Trainer (MCT)](https://www.credly.com/users/tural-suleymani/badges)

15 years of experience in software development

---

## Contributing

1. Fork or branch from your team’s mainline.
2. Create a feature branch (`feature/your-feature`).
3. Commit changes with clear messages.
4. Open a pull request describing behaviour and any Cosmos or Service Bus configuration changes.

---

## Related material

For a broader discussion of DDD, CQRS, and Clean Architecture in C#, see the companion sample: **[the-real-DDD-CQRS-CleanArchitecture](https://github.com/TuralSuleymani/the-real-DDD-CQRS-CleanArchitecture)**.

---

## License

This project is free and open for use. Feel free to download, explore, modify, and use it in your own projects.

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