The ParaPy language aims at making Knowledge Based Engineering accessible to both industry and academia. Our high-level, declarative modelling language allows you to quickly build parametric, rule-based models with only few lines of code. Background algorithms track dependencies, cache results and lazily evaluate only what is needed, assuring the performance and consistency of your model. Developers with only basic-level knowledge of the Python programming, should immediately feel comfortable with ParaPy and be able to get started quickly.