Kardia — modular business system

Starting point

Small companies juggle calendar, tasks, notes, reports and time tracking across half a dozen separate tools — or spreadsheets. An integrated system barely exists for them without adopting a heavy enterprise suite.

Approach

Kardia: a modular business system whose building blocks you switch on like bricks — calendar, tasks, notes, reports, time tracking — connected by an AI assistant. Its principle: propose-then-approve — it reads across modules and suggests, but executes nothing without human approval.

Build

A modular monolith: FastAPI + a React 19 PWA. Multi-tenancy via PostgreSQL Row-Level Security (role NOBYPASSRLS) — enforced by the database, with mandatory isolation tests per table. The AI assistant speaks through an OpenAI-compatible seam: the same inference locally (llama.cpp) or EU-serverless, so switching provider is configuration, not a rewrite.

Status

Runs production-like on its own EU infrastructure (Caddy, docker-compose, auto-HTTPS). Over 350 backend tests, Playwright end-to-end tests, nightly backups with a restore runbook and monitoring (Sentry, EU).

The product page shows where Kardia is heading: Kardia as a product.