Enterprise Go: How to Write Code You Won't Be Ashamed to Show Your CTO

Go in Big Business: Why It's No Longer Just a "Language for Microservices"

When you hear "Enterprise Go," what comes to mind? Boring corporate regulations? Endless code reviews? Or maybe the feeling that Go is only for startups and DevOps?

In reality, Go in enterprise is a completely different level of discipline and engineering culture. In large companies (Uber, Dropbox, Salesforce, Twitch), Go is used not just for microservices, but for entire platforms processing millions of requests per second. And here, "it just works" is not enough.

In this article, we'll break down the key features of Go development in enterprise: from package design to production logging. Lots of code and minimal fluff.

1. Architecture: Don't Repeat the "Monolith in Microservices" Mistake

The most common problem I see in enterprise-level Go projects is the attempt to transfer a Java-style architecture to Go. The result: hundreds of unnecessary interfaces and layers of abstraction that only slow down development.

The "Package by Feature, Not by Layer" Rule

Instead of creating folders like /models, /handlers, /services — group by business domains:

myapp/\n├── cmd/\n│   └── server/\n│       └── main.go\n├── internal/\n│   ├── user/          # Everything related to users\n│   │   ├── handler.go\n│   │   ├── service.go\n│   │   ├── repository.go\n│   │   └── user.go    # Data model\n│   ├── payment/       # Everything related to payments\n│   │   ├── handler.go\n│   │   ├── service.go\n│   │   ├── gateway.go\n│   │   └── payment.go\n│   └── pkg/           # Common utilities\n└── go.mod

This approach is one of the Go best practices for enterprise. It reduces coupling and makes the code predictable. When a new developer opens the project, they immediately see the business logic, not layers of abstraction.

Interfaces: Accept Interfaces, Return Structs

This is a classic piece of advice from the Go community, but in enterprise it's critical. Interfaces should be small (1-2 methods) and defined where they are used, not where they are implemented.

// BAD: interface defined next to the implementation\npackage user\n\ntype UserRepository interface {\n    FindByID(id string) (*User, error)\n    Save(user *User) error\n}\n\ntype postgresRepo struct { ... }\n\n// GOOD: interface where it's needed\npackage user\n\ntype Storage interface {\n    Get(id string) (*User, error)\n    Put(user *User) error\n}\n\ntype service struct {\n    db Storage\n}\n\nfunc NewService(db Storage) *service {\n    return &service{db: db}\n}

Why is this important? Because in enterprise, you often change backends (PostgreSQL -> CockroachDB, Redis -> KeyDB). Interfaces defined on the consumer side allow you to do this without pain.

2. Error Handling: Stop Ignoring _

Go has no exceptions, and that's great. But in enterprise projects, errors are not just if err != nil. It's a whole culture.

To Wrap or Not to Wrap?

Use fmt.Errorf with %w to create error chains. This preserves the call stack and simplifies debugging.

func (s *service) ProcessOrder(ctx context.Context, orderID string) error {\n    order, err := s.orderRepo.Get(ctx, orderID)\n    if err != nil {\n        return fmt.Errorf("getting order %s: %w", orderID, err)\n    }\n\n    if err := s.paymentGateway.Charge(ctx, order.Amount); err != nil {\n        return fmt.Errorf("charging for order %s: %w", orderID, err)\n    }\n\n    return nil\n}

At the top level (in handler/middleware), use errors.Is() and errors.As() to check error types:

if errors.Is(err, ErrNotFo