FiscalHub.

FiscalHub is a platform for companies that need to centralize, monitor and export Brazilian NFS-e (Nota Fiscal de Serviço Eletrônica) across multiple sources for Receita Federal compliance. The foundation was deliberately built for SaaS scale (multi-tenancy, async pipelines, isolated per-org data), even though it is not a commercial SaaS product yet. Core modules are already working: XML ingestion, NFS-e parser, SPED EFD generation, email-based document intake and an analytics dashboard. This is a live build, not a prototype.

Multi-tenancy is enforced at two independent levels: the application layer and the database layer. Both work together so that no organization can ever access another's data, even under edge cases. The architecture was a deliberate early decision: retrofitting tenant isolation into a running system is far more expensive than building it correctly from the start.

Authentication is session-based with instant revocation support: logging out or changing a password invalidates access immediately, without waiting for token expiry. The frontend handles session refresh transparently, holding concurrent requests in a queue during renewal so users never see interruptions. The fiscal XML parsers were written with correctness as a priority: Brazilian fiscal documents have several subtle formatting requirements that off-the-shelf parsers get wrong, so the parsing logic was built and validated manually against real documents.

The SPED EFD ICMS/IPI generator produces the pipe-delimited, ISO-8859-1 encoded file required by the Receita Federal specification: no external library, built directly to the official layout manual. Each organization can also receive documents via email: send an XML to a dedicated address and it lands in the processing queue automatically.