At my mom's request, I developed this invoice generator. It reuses Form Builder, a tool I developed to easily generate forms.
Once the form is completed, you can download the invoice in PDF format.
I wanted a simple and minimalist tool.
With the possibility of having a preview of the final rendering.
Two Docker microservices manage respectively the form and the generation of the PDF.
For the form, use the library Form Builder that I developed with the CSS framework Materialize.