Clean Architecture in Practice: Structuring Laravel & Go Projects

Clean architecture isn't just a theoretical concept—it's a practical approach that has saved me countless hours of debugging and refactoring. Here's how I apply it in my daily work.

The core principle is simple: dependencies point inward. Your business logic should never depend on frameworks, databases, or external services. Instead, these external concerns should depend on your business rules through interfaces.

In Laravel, this means moving beyond the typical MVC pattern. I structure projects with a clear domain layer containing entities and use cases, an infrastructure layer for database repositories and external API clients, and an application layer that orchestrates everything.

For example, instead of putting business logic directly in controllers, I create dedicated use case classes. A CreateOrderUseCase class takes an OrderRepositoryInterface as a dependency—it doesn't know or care whether the data is stored in MySQL, PostgreSQL, or a flat file.

In Go, the pattern feels even more natural. Go's implicit interface implementation encourages dependency inversion by default. I organize packages by domain concern rather than technical layer, with clear boundaries between packages.

Testing becomes dramatically easier with clean architecture. Since business logic is decoupled from infrastructure, unit tests can use simple in-memory implementations of repository interfaces. No database setup, no HTTP mocking—just pure logic testing.

The overhead of additional abstraction layers is real, but it pays for itself on any project that lives beyond a few months. When you need to swap a payment provider or migrate databases, the changes are localized to a single implementation file.

Start small: pick one module in your current project and refactor it to follow clean architecture principles. Once you see the benefits, the pattern will spread naturally across your codebase.

1// Domain layer — pure interfaces
2type OrderRepository interface {
3    FindByID(ctx context.Context, id string) (*Order, error)
4    Save(ctx context.Context, order *Order) error
5}
6
7// Use case — depends only on interfaces
8type CreateOrderUseCase struct {
9    repo    OrderRepository
10    notifier Notifier
11}
12
13func (uc *CreateOrderUseCase) Execute(ctx context.Context, req CreateOrderRequest) (*Order, error) {
14    order := NewOrder(req.UserID, req.Items)
15    if err := uc.repo.Save(ctx, order); err != nil {
16        return nil, fmt.Errorf("save order: %w", err)
17    }
18    uc.notifier.Send(ctx, order.UserID, "Order created!")
19    return order, nil
20}