Does Clean Code Mean Clean Architecture?

When looking at some of the newer achievements around FINOS , like the introduction of https://calm.finos.org from Matthew Bain and co, I start to think about cleanliness in code, architecture, etc. But are these the same? When developers hear the term clean code, they often think of readable, maintainable, and well-structured code. On the other hand, clean architecture refers to a system’s overall design, ensuring separation of concerns and maintainability at a larger scale. But does writing clean code automatically translate into clean architecture?

Understanding Clean Code

Clean code, as popularized by Robert C. Martin (Uncle Bob), is about writing code that is:

• Easy to read – Meaningful variable names, consistent formatting, and proper documentation.
• Easy to change – Small, focused functions and modules that follow the Single Responsibility Principle (SRP).
• Free of unnecessary complexity – Avoiding deep nesting, excessive comments, and redundant logic.

A clean codebase is enjoyable to work with. It reduces technical debt, simplifies debugging, and improves collaboration. But can a codebase with clean code still have poor architecture? Absolutely.

Understanding Clean Architecture

Clean Architecture, also championed by Uncle Bob, is an approach to software design that ensures:

• Separation of concerns – Different layers (e.g., presentation, business logic, data access) remain independent.
• Dependency inversion – High-level modules do not depend on low-level modules; instead, both depend on abstractions.
• Testability and maintainability – Business rules are decoupled from frameworks, databases, and UI elements.

A system can have well-structured components but still contain messy, unreadable code within them. Conversely, a well-written codebase with no overarching architectural strategy may quickly become unmanageable as the system grows.

Where They Overlap and Diverge

• Clean code contributes to clean architecture at a micro level but does not guarantee it.
• Clean architecture ensures a system remains flexible and scalable at a macro level, but poorly written code can still make it difficult to maintain.
• Without clean code, even a well-architected system can become a nightmare to maintain.
• Without clean architecture, even the cleanest code can become fragmented, tightly coupled, and hard to scale.

Striking a Balance

To build robust systems, developers should aim for both clean code and clean architecture. Here’s how:

1. Start with clean code – Encourage good coding practices, maintain readability, and apply SOLID principles.
2. Design with architecture in mind – Ensure separation of concerns, follow best practices like hexagonal or layered architecture.
3. Refactor regularly – Small refactors maintain clean code, while larger refactors can align the system with clean architecture.
4. Think long-term – Choose architectural patterns that match your business needs, but don’t over-engineer for the future.

Conclusion

Clean code and clean architecture are not interchangeable. Clean code makes individual components easier to understand and maintain, while clean architecture ensures the entire system remains scalable and adaptable. Writing clean code is a step toward clean architecture, but it’s not a substitute for designing a well-structured system. To build truly maintainable software, developers must balance both.

What’s your experience with clean code and clean architecture? Do you find it challenging to maintain both? Let’s discuss!