About · SZ. Agency – Sven Zanstra
I'm Sven Zanstra. You deal directly with the person who builds your project.
I'm a developer from the Netherlands, building websites, automation and web apps for businesses in Höfe, March and around the Obersee, the upper part of Lake Zurich. At a fixed price, with a fixed date and in plain language.
- German · English · Dutch
- Projects start from February 2027
- Reply within 24 h on working days
My path
A developer from the Netherlands, soon at the Obersee.
I build software that works in everyday business. For companies with better things to do than keep lists up to date.
I'm a full-stack developer. In plain words: I don't just build what your customers see on screen, but also everything that runs in the background, from sign-up to payment. So I don't need to bring anyone else in for your project.
In the Netherlands I built products of my own that are in use there: VTAG, a web app for sign-ups, payments and waiting lists, and KnipVrij, online appointment booking without a commission on every appointment. See my work
On 1 March 2027 I'm moving to the Obersee, on the Schwyz side of the lake. I already hold first calls by video, and projects start from February 2027.
“SZ stands for Sven Zanstra. It also happens to be the short code for the canton of Schwyz.”
One developer, one contact
Why I work alone. On purpose.
You talk to the person who builds your website. Not to a salesperson who passes it on.
No hand-offs
You explain what you need once, to the person who also builds it. Nothing gets lost between sales, project management and development.
Quick answers
A reply within 24 hours on working days. A short update every week on where your project stands.
Few projects at a time
I work on no more than two larger projects at the same time. That's why I can promise you a fixed date and back it with money.
You stay independent
Code, content, domain and logins belong to you. Any other developer can take over at any time.
How I work
Dutch directness, Swiss precision.
I tell you honestly what is worth doing and what isn't. Then I deliver exactly what the quote says.
- If a website with 5 pages is enough, I won't sell you one with 10.
- If an automation won't pay for itself, I'll tell you before you get a quote.
- If I do need a technical term, I explain it in one sentence.
Fixed price
The price in the quote is the price. No surprises.
Fixed date
A binding date. If I miss it, you get 5% back for each week or part of a week I'm late, up to 20%.
One contact
You always talk to me, never to a call centre.
You own it all
Website, code and domain. No subscription you can't get out of.
What I build for you
Above and below the waterline.
What your customers see, and what runs in the background. All from one person.
Good to know
What else you might want to ask.
- Languages
- German, English and Dutch. Handy if your customers or your team are international.
- How to reach me
- By email at [email protected]. You get a reply within 24 hours on working days.
- Between the Netherlands and Switzerland
- A Dutch company setting up in Switzerland, or a Swiss company selling into the Netherlands and Belgium? I am Dutch, I'm moving to Switzerland and I work in German, English and Dutch. I can build your website and tools in all three languages, and tell you plainly what customers on the other side expect.
- One more thing
- I'm also a physiotherapist (trained in the Netherlands), Swiss SRK recognition in progress (the Swiss Red Cross recognises foreign health diplomas). That's why I know everyday practice life and also build websites for practices.
You're new to Switzerland. Why should I trust you?
Because you carry no risk. The price in the quote is fixed. If I deliver after the agreed date, you get 5% of the price back for each week or part of a week of delay, up to 20%. And in the first call I show you my own products live.
What happens if you're ever unavailable?
At handover you get all logins, the code and a short guide. With those, any other developer can take over. You never depend on me.
Where do we meet?
The first call takes 30 minutes and is free. Until I move on 1 March 2027, I hold it by video. After that I'm happy to visit you in Höfe and March too.
Do you work for companies outside the region?
Yes. My focus is on companies in Höfe, March, Rapperswil-Jona and around Lake Zurich. I also build automation and web apps for companies across German-speaking Switzerland, by video.
Next available start: February 2027
Let's get to know each other. 30 minutes, free.
You get a reply within 24 hours on working days, and a fixed-price quote with a delivery date within 48 hours of our call.