Hello, I'm Willem.

A photo of Willem

I build robust software for business and create independent apps used by millions.

Explore my work

For Business & Innovation

As a technical partner, I build the digital backbone for growing companies, combining strategic thinking with robust and secure software.

Lemmid B.V.Your trusted partner in technology

→ See my Expertise & Services

For People & Passion

As an independent creator, I build with passion apps that people keep using with pleasure, with millions of downloads worldwide as a result.

Snake '97Millions of downloads worldwide

→ Discover my Independent Apps

One Guiding Philosophy

Whether architecting a backend or designing a simple game, my approach is the same: discipline, endurance, and a clear focus on the end goal. It's a mindset shaped on the road as a marathon runner and at home as a father. I build things that are simple, strong and made to last.

Insights from the Blog

The Agentic Web

How I'm preparing my website for the coming Agentic Web and the future of AI.

Auscultare Podcast + Audiobook Player

Building Auscultare: a simple, libre audio app because the alternatives were too cluttered.

Hello, stranger

A simple experiment in human connection and what happens when you look up and talk to strangers.