The Seductive Logic of Building Your Own
Custom CMS projects have a seductive logic: you know exactly what you need, so why pay for features you won't use? You're a developer. You can build this in a weekend. It'll be lean, fast, exactly right.
Six months later, you're maintaining a content management system instead of building the product you actually wanted to build. The CMS has become the product.
I've watched this happen to smart people more times than I can count. I've done it myself. The math looks different at the start than it does at month eight.
What the Real Cost Is
The direct cost — server time, your hours — is the easy part to calculate. The harder cost is opportunity cost. Every hour you spend fixing a bug in your custom CMS is an hour you're not spending on the thing that actually differentiates your product.
There's a useful framework for this in the dev culture conversation: the distinction between core and context. Core is what makes your product unique. Context is everything else that has to exist for core to function. A CMS is almost always context. It's infrastructure. It's not the thing.
The problem is that building your own CMS feels like core work. It feels like you're making something. You are making something — you're just making the wrong thing.
The Maintenance Trap
Here's what happens at month three. You've shipped the CMS. It works. You're using it. Then you need a feature — maybe image resizing, maybe scheduled publishing, maybe a better editor. You build it. It takes a week.
Then you need another feature. Then a bug appears in the feature you built last month. Then you upgrade a dependency and something breaks. Then you need to add a user with different permissions and realize you never built a proper permissions system.
This is the maintenance trap. It's not that any individual task is hard. It's that the tasks never stop. A commercial CMS has a team of people handling this. You have yourself, and you have the product you actually wanted to build sitting in a branch, waiting.
The maker mindset is valuable, but it has a failure mode: the belief that building something yourself is always better than using something that exists. Sometimes it is. For a CMS, it almost never is.
When Building Your Own Actually Makes Sense
There are cases where a custom CMS is the right call. If your content structure is genuinely unusual — not "we have a few custom fields" unusual, but "no existing system can model this data" unusual — then building makes sense. If you're at a scale where the cost of a commercial solution is significant and you have dedicated engineering capacity, it might make sense.
Most projects don't meet either bar. Most projects have content that looks like: title, body, author, date, maybe a few tags. That's what every CMS in existence handles well.
The technical experiments worth doing are the ones that teach you something you couldn't learn another way. Building a CMS from scratch teaches you how CMSes work. That's useful knowledge. But you can get that knowledge by reading the source of an existing one, or by building a toy version you never deploy.
What to Do Instead
Pick a CMS that's boring and well-maintained. Use it. Customize it within its extension points. When you hit a wall, ask whether the wall is actually a wall or just friction you're not used to.
The time you save goes into the product. The product is the thing. The CMS is not the thing.
I've seen teams ship faster after switching from a custom CMS to a commercial one. Not because the commercial one is better in every way — it isn't — but because it removes a category of work that was consuming engineering attention without producing user value.
That's the real cost of the CMS you built yourself. Not the hours you spent building it. The hours you spent maintaining it instead of building something that mattered. More on systems thinking and product development at Calitoy Core.