E-Invoicing startup ecosystem

D DDD Invoices

DDD Invoices is a Ljubljana-based API-first compliance platform that lets software vendors, ERPs, accounting tools, and marketplaces emit fully compliant e-invoices and fiscal reports across dozens of jurisdictions through a single integration. The product abstracts country-specific formats (Peppol BIS, FatturaPA, UBL, FacturX, SAF-T, FA_VAT and others), government clearance flows, digital signing requirements, and archival rules, so the customer team does not have to track the dozens of overlapping mandates that the EU's VAT in the Digital Age (ViDA) agenda is phasing in. The company's bet is that mandatory structured e-invoicing across the EU between 2026 and 2030 turns what used to be a back-office nice-to-have into a default requirement, and that most vertical SaaS builders would rather buy than build that compliance layer. It is one of the clearest examples of a Slovenian B2B SaaS built directly against upcoming European regulation.