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The hiring simulator, available on both websites, embeds a [model](https://github.com/betagouv/syso/blob/master/source/règles/base.yaml) 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](https://github.com/betagouv/syso/wiki/Librairie-de-calcul).
Most of the documentation (including issues and the wiki) is written in french, raise an [issue](https://github.com/betagouv/syso/issues/new) if you are interested and do not speak French.