StellarTech AI
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We build AI that earns its place.

StellarTech AI is a hands-on AI agency from Deventer, the Netherlands. We work with SMEs across Europe.

Marcus van Geelen
Marcus van Geelen · Founder

[01] The story

I didn’t start in tech. For 2.5 years I ran a lead generation business for real estate agents in the US. That meant over 30,000 cold calls and hundreds of sales calls. I learned how sales and operations really work, day to day.

Then I started using AI in my own business. Quotes, invoices, reports, presentations, lead generation, research. In the end, about 70% of it ran on AI.

That’s when it clicked. Most companies don’t need more AI tools. They need AI that fits into how they already work. So that is what we build.

I build the systems myself, together with a small network of specialists. You keep one contact person from start to finish. I also train teams and leaders to use ChatGPT and Claude in their own work.

“AI is the vehicle, not the destination. It has to earn its place in hours saved and money earned.”

[02] How we work

  1. [01]

    One contact person

    You talk to the person who builds your system.

  2. [02]

    Small first

    We start with one real problem and a first working version. No big project up front.

  3. [03]

    Inside your tools

    Your team keeps working the way it does now.

  4. [04]

    You own it

    What we build for you is yours.

  5. [05]

    A person decides

    AI prepares, advises and drafts. Your people make the call.

[03] Where we’ve worked

  • Consultancy
  • Hospitality & leisure
  • Wholesale & distribution
  • Manufacturing & engineering
  • Sports & health

We work with any SME that has repetitive, knowledge-heavy or manual work.

Start with a free AI Scan.

  • One hour with Marcus.
  • The 2–3 places where AI saves you the most.
  • A rough idea of what each one is worth.
Book your free AI Scan

No sales pitch. If AI isn’t worth it for you, we’ll tell you.