I have been working for Atos Origin BV for 15 years, and started my own company HelloApps BV last year.
The first app I created is Krudoku, which is a very challenging and addictive multiplayer sudoku board game. You can download it for free from the Appstore and Google Playstore. I really learned a lot from it, and continue improving the app, add new features, and also like to create apps for companies.
https://play.google.com/store/apps/details?id=com.helloapps.krudoku
https://itunes.apple.com/app/krudoku/id657096358?mt=8