Jon KraayenbrinkHomeES

Work with meJon KraayenbrinkWarsaw

You bring the idea. I build it with AI agents.

I've shipped multiple products on my own this way. Now I build for clients too: apps, tools for businesses, and websites that people and AI search can find.

Services3

Three ways I can help

Build an app

Your idea as a working product: people sign up, use it and pay for it. Web app, browser extension or Mac app.

Let's scope it

Who it's for

  • Founders and creators with an idea and no developer
  • Teams that want a first version in front of users before a big build
  • Anyone who wants AI features inside a real product

What you get

  • A working app with sign-up, a database and payments
  • AI features where they help: image, text or classification
  • Live on your domain, in accounts you own
  • A walkthrough so you can run it after launch

How it works

  1. We cut the idea down to the smallest version worth launching
  2. I build it with AI coding agents and share a live preview as it grows
  3. We launch, then decide what comes next from real use
Things I've built:AiSelfi AI photo appFoto Perfil AI photo appShrinkMac Mac appKaptex Chrome extension

Build a tool for your business

Internal tools, dashboards and automations that take repetitive work off your team. Built around how you already work.

Let's scope it

Who it's for

  • Teams living in spreadsheets, copy-paste and manual sorting
  • Companies that want AI to classify, summarise or route their data
  • Owners who need a tool that fits their process, not a generic SaaS

What you get

  • An internal web tool, dashboard or automation for one clear job
  • Connections to the tools and data you already use, where they allow it
  • Access only for the people who should have it
  • Notes on how it works, so your team isn't stuck with a black box

How it works

  1. You show me the task as it's done today
  2. We agree on what the tool does and what it leaves alone
  3. I build it, your team tries it on real work, and we adjust
Tools I've built for my own work:jev-linkedin-saved-classifier AI sortingsession-sorter AI sortingKaptex Chrome to NotebookLM

Website design

A site that looks good, loads fast and gets found, on Google and in AI answers. Design, SEO, GEO and hosting in one project.

Let's scope it
Design

A custom look built for your brand, readable on every screen size, with copy that says what you do.

SEO

Clean structure, metadata, speed and pages written around what people search for.

GEO

Generative engine optimisation: clear, quotable pages and structured data, so ChatGPT, Perplexity and Google's AI answers can cite you.

Hosting

Deployed on fast hosting with your domain and HTTPS, set up in an account you own.

Who it's for

  • Businesses with an old or plain site that no longer fits
  • Launches that need a landing page that converts
  • Anyone who wants to show up when people ask AI for a recommendation

What you get

  • A designed and built site, live on your domain
  • SEO and GEO basics done from day one
  • Hosting set up, with you holding the keys

How it works

  1. You share your business, audience and sites you like
  2. I send a design direction as a live preview
  3. We refine it, then I launch it on your domain
Sites I've designed and run:Qué IA Es directorySkills Agentes directoryAprende Vibe Coding courseDon Prompt promptsclaude-pagekit landing page kit
How I build

AI agents do the typing. I make the calls.

I write the plan, choose the stack and review what the agents produce. Then I test it like a user would. It's the same way I build my own products.

Claude CodeCursorLovableVercelSupabaseStripe
  1. jonPlan the scope, screens and data
  2. aiWrite the code, step by step
  3. jonReview every change and fix what's off
  4. jonTest it like a user, on real devices
  5. aiHelp with the boring parts: docs, metadata, cleanup
  6. jonShip it to your domain
Process

From first message to launch

Same four steps for every project. The price and timeline come with the scope, before any work starts.

  1. 1. Tell me

    Fill in the short project form. What you want built, for whom, and what you've tried.

  2. 2. Call

    We talk it through, so I understand the problem and you can see if we're a fit.

  3. 3. Scope

    You get a written scope: what's in, what's out, the price and the timeline.

  4. 4. Build and launch

    I build it with you watching a live preview, then launch it and hand it over.

FAQ

Questions before we talk

How much does it cost?

It depends on what we build. After the call you get a written scope with the price, before any work starts.

How long does it take?

Also depends on scope. The timeline is in the written scope, next to the price, so you know both before saying yes.

You use AI to write code. Is it any good?

AI coding agents write most of the code. I plan the work, review every change, and test the result before you see it. It's how I've built and shipped my own products, which you can try on the home page.

What is GEO?

Generative engine optimisation. More people ask ChatGPT, Perplexity or Google's AI answers instead of scrolling search results. GEO means writing and structuring your pages so those tools understand them and can cite you.

Who owns the code and the accounts?

You do. The code, domain and hosting live in accounts in your name.

Which languages do you work in?

English and Spanish, for both the project and the site copy.

I have something half-built. Can you take it over?

Maybe. Send it through the form with a link or a short description and I'll tell you honestly if it makes sense to continue or restart.

Have something you want built?

Tell me what it is and what you've tried so far. I'll come back with questions or a time to talk.

Open the project form
Tell me about your project