The traditional approach to software design is to first draw the architecture diagram and then implement the system based on it. However, this isn’t always ideal: the implemented code may not fully match the diagram, and it’s hard to keep them aligned over time. Instead, we can take a “code-first” approach that avoids these drawbacks. Let’s look at the benefits of Architecture as Code (AaC).

Benefits

1. Define it in code

One of the key benefits of Architecture as Code is that you define the architecture directly in your code. Architecture and code aren’t separate—they belong together and should live together. Imagine “coding” your diagram: it becomes part of the codebase, always available and kept up to date. Many additional benefits follow from this, which we’ll explore later.

2. Version control your architecture

Another major benefit of AaC is that you can version your architecture and track when, why, and how it changed over time. Remember, architecture is evolutionary—it won’t just emerge.

3. Write tests for it

AaC also makes it easier to write tests for your architecture. Yes—you read that correctly: tests. Writing architectural tests has many benefits. One is that you can assert that the code follows the defined architecture. Another is that you fail fast, which is incredibly valuable. Finally, these tests can start conversations about architectural decisions.

4. Visualize

And of course, there’s visualization. In the end, we all want to visualize the architecture to confirm components are logically connected—and to present it to business stakeholders. I won’t go deeper into visualization here.

5. Feed it into an LLM

The last benefit—one that has become more important in recent years—is that you can feed your architecture into an LLM. This unlocks many possibilities. Imagine how many questions you could ask an LLM about your architecture.

In the next posts, we’ll discuss how to define your architecture as code in practice.