We make complex simple.
Stoneworx builds and integrates Mendix solutions with a highly experienced development team in the Netherlands and Porto. For banks, trading companies and organisations with a demanding ERP landscape, among others. One team, the same quality.
Experience at ABN AMRO, Rabobank, Action, Kadaster and the Dutch Ministry of Health.With Mendix, in your landscape, with a team that stays.
Senior Mendix teams
With us you do not hire a developer, you get a team. Everyone has at least three years of Mendix experience and is certified at Advanced level or higher, with our Expertise Centre behind them.
Mendix in your landscape
Your ERP, HR system or legacy stays what it is. We build the flexibility around it, in Mendix.
Banks and fintech
We work within existing teams and at architecture level, in environments where compliance and security are never an afterthought.
Advice on software costs
When is custom software cheaper than licences? We work it out beforehand, in your figures.
One team in the Netherlands and Porto. The same quality.
Whoever hires a Mendix developer from us gets a whole team with it. You have one point of contact; we take care of the rest.
A consultant or architect in the Netherlands is your point of contact, for the whole engagement.
Developers in the Netherlands and Porto build. All employed by Stoneworx, in fixed teams since 2023.
Our Mendix Expertise Centre reviews architecture, integrations, security and performance. As standard; you do not have to ask for it.
Thanks to Porto we also deliver complete development teams, at a sharper rate. If your project suddenly needs more or different expertise, we scale up fast.
With Mendix you can build an incredible amount, and fast. That is why we start with the question of what is needed.
Explore
We start with your process and your question, not with the technology. What is really needed, and what do you want to achieve? We also say so when Mendix is not the right tool.
Proposal
A concrete proposal: what we build, what we deliberately leave out, who does it, what it costs and when it is ready.
Build
In short sprints, with your people involved. Something working every sprint, every important decision reviewed by the Expertise Centre.
Evolve
Live is not done. We keep improving for as long as you want, or hand over properly to your own team.
Everyone certified at Advanced level or higher, with at least three years of Mendix experience. As of September 2026.
Stoneworx was enlisted by ABN AMRO as expert partner and delivered additional highly trained Mendix professionals from Portugal. Working in a hybrid setup with our local teams, they added speed and quality while maintaining strong cost control.
Current and previous clients
No surprises. People who think along.
Experience you notice
More than ten years of Mendix and over twenty years of IT: architecture, integrations, cloud and security. We also know everything attached to the platform.
Fixed points of contact
The same people for the duration of the engagement. No rotating line-up.
Thinking along
We do not only build what you ask for. We also tell you when something else is smarter, or when something is not needed.
Transparent and honest
Clear agreements beforehand, open communication during the work, no surprises afterwards.
No-nonsense
Practical software that does what was agreed. No superfluous features, no thick reports.
Scalable
From one developer to a complete team, from the Netherlands and Porto. Scaling up with extra expertise is quick.
Do not take our word for it.
Everything we say about ourselves can be checked at the source.
You will find our products at NEDPT
Two products grew out of our work for trading companies: TradePIM, for product information and GS1, and FieldSales, the app for field sales teams. We deliver them under our product label NEDPT. This site is about our work as a Mendix partner; everything about the products is on nedpt.com.
Articles by our colleagues about Mendix in practice.
Reducing structural costs through smarter software policy
Why it pays to periodically reassess recurring software costs from a financial perspective. A Stoneworx view on build versus buy.
NewsStoneworx and NedPT become one organisation
Two countries, one team. The Dutch and Portuguese Mendix organisations formally continue under the name Stoneworx.
ArticleSecuring your Mendix app
Common pitfalls in entity validation, and three robust methods for securing your application.
Wondering whether we are a fit for your question?
Call Stoneworx Netherlands or send an email. We will also tell you if we are not the right party.