German thoroughness. Merchant thinking.

CT4M stands for Commerce Tools for Merchants.

We develop tools for PrestaShop with a fairly simple idea behind them: software for merchants should solve business problems, not create new technical ones.

CT4M was born from running an e-commerce business ourselves. Many of our tools started with a real problem in everyday shop operations — something that took too much time, required too many manual steps or simply wasn’t handled well by the software available.

So we built it.

And because we’re based in Düsseldorf, Germany, we’ll happily admit to a certain weakness for doing things thoroughly.

Not because software needs to be complicated. Quite the opposite.

Good software should make complicated things simpler.

Built around business. Not around code.

Our starting point is rarely a technical feature.

It is usually a question such as:

Why are we doing this manually?

Why can’t PrestaShop show us this information?

Why does this process require six steps when it should require two?

From there, we work backwards towards the technology.

That merchant perspective is important to us. A technically impressive module that makes everyday work more complicated has missed its purpose.

Our tools should save time, prevent mistakes, provide useful information or make a process noticeably easier.

Preferably all four.

AI-assisted. Human-controlled.

We use modern AI-assisted development extensively.

Specialized development and review agents help us analyse large codebases, investigate dependencies, test edge cases and review changes at a speed that would have been difficult to achieve with traditional development workflows alone.

But speed is not the objective.

Better software is.

Architecture, requirements, security decisions and release approval remain under human control. We use AI to examine more, test more and spot more — not as an excuse to lower the standard of what we release.

We would rather delay a release than ship a bad one.

Software running inside an online shop deserves some respect.

A PrestaShop module can have access to orders, customers, payments, databases and business-critical processes. A small programming mistake can therefore have consequences far beyond the module itself.

We don’t believe that “it works on our test shop” is a sufficient quality standard.

Before a CT4M product is released, we want to understand what it changes, what it depends on and what could go wrong.

That includes the boring things.

Especially the boring things.

Our standards

We aim to build CT4M modules so that they remain good neighbours inside a PrestaShop installation.

That means keeping modifications as isolated as possible, using PrestaShop’s established APIs, hooks and extension mechanisms, and avoiding overrides wherever reasonably possible. We do not modify PrestaShop core files.

A CT4M module should not assume that it is the only module in the shop. We therefore pay particular attention to interactions with other modules, existing hooks, database structures and normal PrestaShop behaviour.

Security is treated as part of development rather than something added shortly before release. Depending on the module, this includes permission and authentication checks, CSRF protection, validation and sanitisation of input, safe database access, controlled file handling and careful treatment of credentials and sensitive data.

We also test against the PrestaShop and PHP versions for which we explicitly declare compatibility. We prefer a clearly defined compatibility range that we have actually tested over a reassuring-looking claim that we cannot substantiate.

And when PrestaShop changes, we would rather adapt our modules properly than work around those changes with increasingly fragile modifications.

Our objective is straightforward:

Secure code. Clean integration. Predictable behaviour. Minimal interference with the rest of the shop.

Or, to put it a little more traditionally:

If we’re going to build it, we’d like to build it properly.