selected work
A practical portfolio of things I build: mobile apps, educational games for family learning, open-source .NET tooling, and developer workflow experiments.
mobile products
The two product-style app pages are the strongest examples of shippable work: clear value, support routes, legal pages, store placeholders, and real user flows.
A serious cross-platform board-game product with AI, online play, learning flows, and launch-ready app pages.
A mobile-first educational app for arithmetic, reading, and topography practice.
developer tools
Libraries and experiments aimed at making AI-assisted and .NET development more productive.
An open-source .NET library for prompt management, memory, workflows, tools, streaming, and resilience.
archive
Jens, Fleur, and Mats were earlier learning-game experiments. They now sit in the archive because the strongest ideas from those projects have been rolled into LeesSom.nl.
A map-based geography quiz with practice and speed-challenge modes.
This earlier learning experiment has been folded into the broader product direction now carried by LeesSom.nl.
A football-themed math practice game for quick, playful learning sessions.
The strongest ideas from Jens now live on in LeesSom.nl instead of as a separate standalone project.
A gymnastics-themed math game with achievements and gentle progression.
Fleur has been archived as its learning loops were consolidated into the more complete LeesSom.nl experience.