Refactoring

Often called the Gang of Four book, Design Patterns catalogues reusable solutions for object-oriented systems. Each pattern outlines intent, structure, and trade-offs so teams can spot when the guidance helps and when it adds unnecessary complexity. Despite its age, the catalogue remains a foundational reference for developers who need shared language around extensibility and maintainability.

Refactoring teaches how to improve existing code safely by taking small, behaviour-preserving steps. Martin Fowler and collaborators catalogue common code smells, explain when to refactor, and demonstrate each transformation with tests. The examples use Java (and newer editions TypeScript), but the principles apply across languages whenever teams need cleaner design.

Clean Code advocates for readable, maintainable software through small, disciplined practices. Robert C. Martin demonstrates naming, function extraction, and test-first habits that keep code easy to change while cautioning against dogma. Treat it as a set of guiding principles to inspire teams, adapting the advice to modern tooling and context.

An open-source platform for automated code refactoring. It provides a set of recipes to automatically refactor your codebase, making it easier to maintain and improve the quality of your code. The ability to make large-scale changes across your codebase are a great way to make sure your code is up to date with all the latest dependency updates. The company behind Open Rewrite also offers a paid version with additional features.