I'm Finance Ops, not a developer. I built a KoSIT-valid XRechnung generator in the browser anyway

My day job is Finance Ops and accounting. I'm not a software engineer by training. But in DACH, the gap between "what accountants need" and "what developers build" is real — and expensive. So I closed it myself. Live demo (local-first, zero tracking): https://me-mateescu.de/tools/xrechnung/ The problem I kept hitting Germany's E-Rechnungspflicht is no longer theoretical. B2G (Business-to-Government) invoicing has required a valid XRechnung for years, and B2B is rolling out in phases (reception from 2025, issuance for >€800k revenue from 2027, and broadly from 2028). A PDF — even a perfect one — is not enough. Every tool I found was one of three things: Enterprise ERP (SAP, DATEV): full XRechnung support, hundreds of euros/month, built for teams, not freelancers SaaS invoicing (Lexoffice, sevDesk): subscription-based, your invoice data lives on their servers, lock-in by design CLI tools : open-source Java/Python libraries that assume you know what java -jar means The missing middle: a f