Clean Architecture in Go: Build a Trader Monorepo using MongoDB

About Course

In this course, you’ll learn how to design, implement and deploy a real-world Go backend using Clean Architecture, MongoDB and Docker, following best practices used in production systems.

We’ll start from scratch with a modular monorepo, where you’ll build a REST API to manage trading strategies. You’ll learn how to keep your codebase organized, testable and scalable. Ready to evolve into microservices in future steps.

Unlike other courses that try to cover everything at once, this one is focused and practical: you’ll build a solid foundation, understand how to separate concerns using Clean Architecture and deliver a working backend project that you can actually use and extend.

What you’ll build: A backend service that can:

Define and manage trading strategies.
Store and retrieve data from MongoDB.
Be tested locally with Postman and Go tests.
Run in Docker and be extended into microservices later.

What you’ll learn:

How Clean Architecture applies to Go projects.
How to model your domain using entities and use cases.
How to structure a monorepo with independent layers.
MongoDB integration and persistence.
Writing unit and integration tests in Go.
How to build, test and run everything with Docker and Docker Compose.

Why this course matters

This course is the first part of a larger journey. By the end, you’ll have a clean and modular Go backend. And the skills to scale it up later into multiple microservices if your system demands it.

Whether you’re just getting started with Go or looking for a real-world example of Clean Architecture in action, this course is your ideal starting point.

Course Content

Course Introduction & Setup
Learn the project goals, Clean Architecture basics, repo setup, Go module init and MongoDB with Docker to prepare the foundation of our backend.

Business requirements

05:11
Understanding the impact of business requirements

05:41
Creating the GitHub repository

06:12
Clean Architecture: Introduction

08:34
Entities in Clean Architecture

10:13
Activity – Define your own entities

02:14
Initializing the Go module

06:01
Docker Compose – MongoDB setup

09:12

Architecture & MongoDB Integration
Understand ports and adapters, work with the MongoDB client, handle document IDs, avoid common mistakes and map data cleanly between layers.

Testing in Go
Learn Go testing fundamentals: test pyramid, unit tests, assertions and table-driven tests to build reliable, maintainable code.

Implementing Use Cases
Implement core business logic with clean use cases, handle domain errors, use mocks for testing and build the Strategies service.

Building the Transport Layer (HTTP)
Use Gin to build HTTP endpoints, map requests to use cases, structure routes cleanly and expose your application through a proper transport layer.

Application Bootstrap & Configuration
Assemble the full application, write the main entrypoint, manage environment variables and run the service end-to-end.

Bonus Section
Continue learning with me

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About Course

What Will You Learn?

Course Content

Course Introduction & Setup Learn the project goals, Clean Architecture basics, repo setup, Go module init and MongoDB with Docker to prepare the foundation of our backend.

Business requirements

Understanding the impact of business requirements

Creating the GitHub repository

Clean Architecture: Introduction

Entities in Clean Architecture

Activity – Define your own entities

Initializing the Go module

Docker Compose – MongoDB setup

Architecture & MongoDB Integration Understand ports and adapters, work with the MongoDB client, handle document IDs, avoid common mistakes and map data cleanly between layers.

Ports and Adapters explained

Interacting with the MongoDB client

How document IDs work in MongoDB

Common mistake with document structure

Transformers: mapping between layers

Testing in Go Learn Go testing fundamentals: test pyramid, unit tests, assertions and table-driven tests to build reliable, maintainable code.

Testing concepts: The Pyramid of Tests

Writing basic unit tests in Go

Using assertions effectively

Table-driven tests in Go

Run your tests using the terminal

Implementing Use Cases Implement core business logic with clean use cases, handle domain errors, use mocks for testing and build the Strategies service.

Get Strategy by ID

Handling common business errors

Implementing CreateStrategy use case

Manual mocking for use case testing

Generating mocks with mockery

Implementing GetStrategyByID use case

Creating the Strategies service

Building the Transport Layer (HTTP) Use Gin to build HTTP endpoints, map requests to use cases, structure routes cleanly and expose your application through a proper transport layer.

Choosing an HTTP server in Go

Implementing CreateStrategy HTTP endpoint

Implementing GetStrategyByID HTTP endpoint

Adding routes and wiring them correctly

Application Bootstrap & Configuration Assemble the full application, write the main entrypoint, manage environment variables and run the service end-to-end.

Creating the application

Writing the main.go file

Managing environment variables and configuration

Running our service for the first time

Bonus Section Continue learning with me

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