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

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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

When the Going Gets Tough

What Running a Marathon Taught Me About Managing Long-Term Software Projects

Vision Pro

First Principles: Deconstructing the User Experience of the Vision Pro

Inspiration from a child

Patience and Parenting: How Raising Kids Improved My Client Communication