Caderno Digital do Edifício

The problem

A building’s paperwork (occupancy licence, condominium rules, insurance, energy certificate, works) is scattered across folders, emails and property managers. In June 2026 the Portuguese government announced a national Digital Building Logbook, but with no timeline.

What I built

A platform that already does today what the law promises, aligned with the European Digital Building Logbook:

• a document vault for the building and each unit;
• a history of works and maintenance, with invoices and attachments;
• a digital passport for the building and each unit, as a PDF with an integrity proof;
• a legal readiness index showing what is missing;
• email alerts when insurance, a certificate or an inspection is about to expire;
• free tools with no sign-up, such as a reserve fund calculator.

Decisions

• Proof of authenticity that doesn’t depend on me. Each document gets a SHA-256 hash anchored in the Bitcoin blockchain through OpenTimestamps. Anyone can verify a file on the public verification page, with no account.
• Public calendars instead of a custom contract. Using OpenTimestamps avoids maintaining code on a blockchain and costs nothing per document.
• Unit import from CSV or JSON, or extracted from documents with AI (OCR), so nothing has to be typed by hand.
• Nothing disappears without a trace. Removed documents are kept in the audit log.

Technology

React and Mantine on the frontend, FastAPI on the backend, MongoDB, S3-compatible storage (MinIO), Nginx and Docker Compose, with payments through Stripe.