$ ls -la /portfolio
Showcasing projects and websites I've built for my family and the community.
$ cat projects.json
FEATURED APP
International Draughts
International Draughts - 10×10 FMJD Board Game
A modern mobile draughts app where you can play full FMJD 10×10 International Draughts against AI at four difficulty levels. Includes account-based progress, rating history, and a production-ready legal/support setup for app stores.
✨ Key Features:
- ▸ Full FMJD 10×10 International Draughts rules
- ▸ Four AI difficulty levels
- ▸ Account system with game history and rating tracking
- ▸ Cross-platform availability for iOS and Android
- ▸ Store-ready privacy, terms, and support pages
- ▸ Designed for fast, focused gameplay sessions
🛠️ Tech Stack:
LeesSom
LeesSom - Educational Learning Platform
A comprehensive educational platform combining the best ideas from Worldio, Football Math, and Math Gymnastics into one unified learning experience. Built for Dutch children (Groep 1-8, ages 4-12), LeesSom transforms math, geography, and reading exercises into colorful adventures that make learning feel like play.
✨ Key Features:
- ▸ Three educational games: Math, Geography, and Reading
- ▸ Grade-appropriate difficulty adapting to Groep 1-8
- ▸ User authentication with Google and Microsoft OAuth
- ▸ Progress tracking with statistics and achievements
- ▸ Parent dashboard to monitor children's learning
- ▸ Guest mode for instant play without registration
- ▸ Daily challenges and streak tracking
- ▸ Comprehensive accessibility and customization settings
🛠️ Tech Stack:
Mats
Worldio - Geography Quiz Game
An interactive geography learning game with multiple game modes including practice and speed challenge. Features a map-based interface where players identify locations around the world.
✨ Key Features:
- ▸ Interactive map interface using Leaflet.js
- ▸ Multiple game modes (Practice & Speed Challenge)
- ▸ Score tracking with high scores and streaks
- ▸ OpenStreetMap integration
- ▸ 15-second timed challenges
🛠️ Tech Stack:
Jens
Jens' Football Math Game
A fun football-themed math game where players shoot the ball into goals with correct answers. Designed to make learning math engaging through sports.
✨ Key Features:
- ▸ Football/soccer theme with goal-shooting mechanics
- ▸ Multiple math modes: Mixed, Addition, Multiplication, Division
- ▸ Interactive gameplay designed for kids
- ▸ Visual feedback and animations
- ▸ Progress tracking
🛠️ Tech Stack:
Fleur
Fleur's Math Gymnastics
A gymnastics-themed educational game focused on building math skills. Features achievement system with medals, stars, and trophies to motivate young learners.
✨ Key Features:
- ▸ Gymnastics theme with visual appeal
- ▸ Gamified learning with achievement system
- ▸ Multiple skill levels and challenges
- ▸ Progress tracking with medals and stars
- ▸ Kid-friendly interface
🛠️ Tech Stack:
$ cat open-source.json
Open source libraries and tools I've built for the developer community.
CogniChain
v0.2.1LLM Orchestration for .NET
An open-source .NET 10 library for building LLM-powered applications. CogniChain provides the infrastructure you need—prompt management, conversation memory, workflow orchestration, and resilience patterns—so you can focus on building your AI application, not plumbing.
✨ Key Features:
- ▸ Prompt Templates with type-safe variable substitution
- ▸ Conversation Memory with smart token limits
- ▸ Workflow Orchestration for chaining LLM operations
- ▸ Tool Integration for function calling
- ▸ Built-in Retry Logic with exponential backoff
- ▸ Streaming Support for real-time responses