There is a moment in every project where things are going well, everyone is smiling, the tests are green, and someone says the most dangerous sentence in software:
“But what if…?”
That, my friends, is where YAGNI lives.
YAGNI stands for You Aren’t Gonna Need It. It is not a suggestion. It is a quiet warning whispered by future-you, who is tired, under-caffeinated, and maintaining code you wrote while feeling very clever.
YAGNI means: do not build things until you actually need them. Not “might need.” Not “could be useful later.” Not “this would be elegant.” Just need. Right now. Today. With a real use case and a real user who will complain if it’s missing.
If nobody is complaining yet, YAGNI gently taps the sign.
Here is where people get confused.
YAGNI is not anti-thinking. YAGNI is anti-fortune-telling.
You can design with the future in mind. You just do not implement the future until it arrives, knocks on the door, and says, “Hey, I broke production.”
YAGNI and the KISS Principle Are Cousins Who Text Each Other
YAGNI and KISS (Keep It Simple, Stupid) are absolutely related, but they are not the same person.
KISS says: make the solution simple.
YAGNI says: maybe don’t build the solution at all yet.
KISS is about how you build. YAGNI is about whether you should build it right now.
You can violate YAGNI with beautifully simple code. You can also violate KISS while technically following YAGNI. They are best friends who occasionally stage an intervention together.
Real-World “We Should Have Listened to YAGNI” Moments
Let’s talk about the graveyard. It is large. It is full.
The Custom Framework That Replaced Nothing
A team builds a homegrown framework because existing tools are “too limiting.” Six months later, the product still does not ship, onboarding takes three weeks, and the original author has left. The framework is now lore.
YAGNI was screaming the entire time.
The Universal Configuration System
Someone designs a configuration engine that can support every possible deployment scenario across all future products. The current product has exactly one environment. The config system becomes the most complex part of the codebase.
Nobody ever uses half of it. Everyone is afraid to delete it.
The Premature Microservices Explosion
An app with five users launches with twelve services, a service mesh, and distributed tracing. Debugging a login issue requires a meeting and a whiteboard.
YAGNI was ignored in favor of architectural cosplay.
The Rare Moment When YAGNI Loses (And That Is Okay)
Sometimes, someone follows YAGNI perfectly… and still gets burned.
For example: You skip adding pagination because the dataset is small. Then marketing does their job. Suddenly you have millions of records and a database that sounds like a jet engine.
Was YAGNI wrong?
No. You made the best decision with the information you had. The fix is now justified. You need it. YAGNI steps aside politely and lets you work.
YAGNI is not about being psychic. It is about minimizing regret per line of code.
How Simple Can Something Get?
Shockingly simple.
Simple enough that it feels slightly embarrassing.
Simple enough that you wonder if you are being lazy.
That feeling is often a good sign.
The simplest thing that could possibly work usually does. And when it stops working, you have real data instead of guesses.
Why Do We Over-Engineer Things Anyway?
Because over-engineering feels productive.
It feels like preparation. It feels like intelligence. It feels like future-proofing.
It is also comforting. Complexity gives the illusion of control.
But complexity is debt with interest. And the interest compounds quietly, usually on a Friday afternoon.
Why Keeping It Simple Actually Scales Better
Simple systems are easier to change.
Simple systems are easier to explain to new people.
Simple systems break in obvious ways.
The most scalable systems in the world are rarely clever. They are boring, repetitive, and aggressively unromantic.
YAGNI does not kill ambition. It keeps ambition alive long enough to ship.
A Few YAGNI-Friendly Habits
- Build for current requirements, not hypothetical customers.
- Delay decisions that are irreversible until they are unavoidable.
- If a feature has no user, it is a rumor.
- Code is a liability until proven useful.
And perhaps the most important one:
If removing something scares you, that thing probably should not exist yet.
If this resonated, follow me for more writing about software, creativity, and the fine art of deleting code. Drop a comment with your favorite “we totally didn’t need that” story. I promise you are not alone.
Art Prompt (Pointillism): A sunlit urban park rendered entirely through dense constellations of tiny, deliberate dots, forming shimmering layers of color that softly vibrate against one another. Figures drift through the scene with gentle ambiguity, their forms suggested rather than defined, surrounded by dappled light filtering through trees. The palette leans toward warm ochres, muted greens, and subtle blues, creating a sense of calm motion and visual rhythm. The composition feels airy yet precise, with a balanced interplay between structure and softness, evoking a quiet afternoon suspended in time.
Video Prompt: Animate the dotted textures so they subtly pulse and reorganize, with colors gently blooming and receding like breathing light. Figures slowly emerge and dissolve as if assembled from drifting particles, while sunlight flickers across the scene in rhythmic waves. Motion should feel hypnotic and organic, with dots flowing, clustering, and dispersing to create a living canvas that continuously transforms without ever fully settling.
Music Suggestions:
- A Deeper Understanding — Warpaint
- Echoes of Silence — Kiasmos
