In building software, it’s easy to focus on writing code, making features, and getting things working. But real, maintainable systems require more, they require thoughtful architecture. In the article “Five Architectural Principles” posted in the Criteo Engineering blog on Medium, Peter Milne lays out five foundational principles that, in his experience, guide sustainable and scalable software systems. The article is short but it outlines an architectural mindset that feels especially relevant.
Milne begins by outlining five principles he believes lead to more maintainable systems, grounding each one in how teams can better structure software over time. He doesn’t claim that implementation is unimportant, but he does consistently direct attention towards fundamental architectural choices. That emphasis made me reflect on how many of my past projects became unmanageable messes simply because I was focused on writing code rather than the structure supporting it.
One of the principles that Milne discuss is the important of designing components around well-defined responsibilities. He explains that keeping components focused on a single purpose helps reduce unnecessary complexity as systems evolve. His explanation made the idea more concrete for me, especially because it aligns with some of what we’ve learned in class about separation of concerns and the value of components that can change independently.
Milne also emphasizes the importance of clear contacts, the rules or interfaces that describe how parts of a system should interface. He presents contracts as a way to maintain stability, even when internal implementation details change. His explanation made me think about much smoother some of my past group projects would have been if interfaces had been clearly defined from the beginning.
Milne also makes it clear that architectural decisions should be intentional rather than accidental. He doesn’t prescribe strict formulas, but he encourages thoughtful design so that systems can evolve without becoming overly complicated. That perspective resonated pretty heavily with me because it connected to an overarching theme that’s been prevalent throughout 343: the choices we make early on influence how well a system can adapt in the future.
Reading this helped me rethink the way I want to approach future projects. Instead of immediately writing code, I want to start by defining boundaries, identifying responsibilities, and agreeing on interfaces. Architecture is meant to support the system, not struggle to keep up with it. Even though Milne’s article is fairly brief and pretty corporate, it made me realize the value of the invisible structure supporting the visible behavior of software.
https://medium.com/criteo-engineering/five-architectural-principles-d32dc2bfefae
From the blog CS@Worcester – My Coding Blog by Jared Delaney and used with permission of the author. All other rights reserved by the author.
