Complete SaaS ERP Solution for Tax/Accounting Firm

Develop a comprehensive micro‑ERP (web mobile) for a tax and accounting consultancy with modular, API‑driven architecture compliant with Spanish and EU fiscal, customs, and data‑protection rules. Core modules: secure client document portal, invoicing/billing with IVA/VAT handling, payment gateway integration, client self‑registration with digital contract/SEPA signature, and an accounting module supporting SII and exports (XML/CSV/SAF‑T). Full AEAT support for all relevant models (VAT, IRPF, c…