An ERP/CRM for a solo dental clinic, replacing paper forms and a nightly spreadsheet close. A GraphQL API on Node and Postgres, where tenant isolation is enforced by the database instead of by remembering to check it. A Next.js app over it, and a copilot that answers questions about the clinic without the model ever seeing a patient's name, or a number it could alter. In beta at two clinics.
The agent runs on an open-weight model, Qwen3-235B, served through OpenRouter. The accuracy is scored by the author across the copilot task set, not yet by an automated suite.
The finance module is its own ledger rather than an accounting integration: appointment billing lines and the expense book merge in get-finance-ledger.ts, and the filter plus both totals run before the page slice, so the sums cover every row the filters keep and not just the page on screen.
Orchestrated multiple CI workflows triggered on PRs across frontend and backend repositories to enforce strict continuous integration quality gates. The automated test matrix validates static typing, architecture, unit/integration, and database migrations, while inherently performing differential coverage regression against main, detecting stateful schema drift, and running headless Playwright E2E assertions for critical user flows.
Self-reported by the clinic owner, measured against the manual routine it replaced.
A tool-calling agent on the backend, answering in plain Portuguese. The figures in its cards come from the query result rather than from the model, so a number on screen cannot be rewritten by a language model.
Revenue, appointments and no-shows on one screen. Closing the day stops being a nightly retyping job, which is the four hours this was built to remove.
Paper forms became one screen, filled once at the point of care. Health data sits under art. 11 of the LGPD, so a patient's name never reaches an external model unaliased.
Catalogue prices are copied onto the billing line and frozen, so repricing a service does not rewrite last year's invoices. Partial refunds are atomic: two concurrent refunds against one payment resolve to exactly one winner.
Four roles, and the role decides the screen. A receptionist sees what a receptionist needs, and the agent is handed only the tools that role is allowed to call.
Consent records, retention and the account settings. Every mutation that touches a patient is written to an audit log.
