It's a React, Redux, Webpack website hosted on Netlify with no backend.
The hiring simulator, available on both websites, embeds a model of the french tax system as a YAML domain specific language. It enables displaying the computing rules on the Web and having a single source of logic for both the computation engine (a JS library) and the generated end-user conversation-like form.
The engine with the French tax law is available as a NPM module and explained on the wiki.
Most of the documentation (including issues and the wiki) is written in french, please raise an issue if you are interested and do not speak French.
If you want to contribute to this application, please check out CONTRIBUTION.md.
The website will run well on modern browsers. Internet Explorer is not supported anymore (it should work but with visual glitches and performance issues).
This compatibility is tested thanks to BrowserStack's free open source program.