Hi everyone, I'm an electronics engineering student in Germany. I've built several small web projects (mostly with AI-assisted coding), and now I want to build my first real SaaS. The idea: Germany now requires businesses to receive E-Rechnungen, and sending becomes mandatory in the coming years. Many freelancers and small businesses don't know how to create valid XRechnung or ZUGFeRD files. I want to build a simple tool where they enter their invoice data (or upload a PDF) and get a validated, compliant e-invoice. I know the market has competitors (sevDesk, free generators, etc.), so I'm looking at a narrow niche, for example Handwerker or online sellers. Where I'd love help: Has anyone worked with XRechnung/ZUGFeRD libraries? Which ones are reliable (Java, Python, Node)? Is validation with the KoSIT validator realistic to self-host? Does a niche focus make sense, or is this market too crowded? If anyone is interested in collaborating, I'm open to a partnership.   submitted by   /u/OfficeAppropriate333 [link]   [comments]