Mevfiew

I'm Matthew de Haan, freelance developer based in Rotterdam and CTO at GSES (Global Sustainable Enterprise System). I build web platforms with a focus on sustainability tech -- tools that help organisations measure, report, and improve their environmental impact.

With a background in psychology, I bring a different perspective to product design. Understanding how people think and behave shapes better UX decisions, clearer interfaces, and products people actually want to use.

I prefer working directly with founders and teams. No layers, no endless meetings -- clear communication, fast iteration, and work you can be proud of.