Refactoring Go (Golang) Code: Improving Architecture and Performance

The book "Refactoring Go (Golang) Code" is a practical guide for developers who want to learn how to systematically improve existing projects in the Go language. The author, Igor Volkov, shares years of experience working with production code and offers proven techniques that will help turn a chaotic codebase into a clean, maintainable system.

What this book is about

Unlike textbooks on "clean code," this book focuses specifically on refactoring real-world projects. You will learn:

• How to identify code smells specific to Go: redundant interfaces, incorrect goroutine handling, and package pitfalls.
• Step-by-step refactoring techniques: from simple variable renaming to decomposing monolithic functions and extracting modules.
• How to safely refactor code using tests (unit, integration, golden files) and Go tools (go vet, staticcheck, delve).
• Architectural approaches: implementing dependency injection, separating business logic from HTTP handlers, and proper package organization.
• Performance optimization through refactoring: profiling, eliminating bottlenecks, and managing memory and allocations.

Who this book is for

The book is aimed at Junior+ and Middle Go developers who:

• Work with legacy projects and don't know where to start improving them.
• Want to write code that is easy to maintain, test, and extend.
• Are preparing for Senior-level interviews and want to discuss refactoring at a professional level.
• Are looking for a systematic approach rather than scattered advice from articles.

What you will learn after reading

• Learn to identify problematic areas in Go code and make decisions about refactoring.
• Master safe techniques: "extract method," "replace conditional with polymorphism," "separate responsibilities."
• Understand how refactoring affects performance and how to avoid breaking working code.
• Be able to introduce a culture of refactoring in your team and justify its necessity.

The book contains numerous Go code examples, real-world cases from commercial development, and practical exercises. "Refactoring Go (Golang) Code" will become your go-to reference for bringing projects into order.