RentTracker

The problem

Landlords and property managers were tracking rent, properties, and tenants in spreadsheets, with no shared team access and no automatic visibility into who was overdue.

The solution

A multi-tenant SaaS where each organization gets role-based access (owner, admin, manager, viewer), real CRUD for properties, units, tenants, and leases, and payment recording with automatic overdue detection instead of manual spreadsheet checks.

Architecture

A pnpm monorepo with a web app, an API, and a background worker: a nightly BullMQ job sweeps overdue payments and dispatches the resulting notifications, and Redis backs both the dashboard cache and the auth rate limiter so neither resets when a process restarts.

• React
• TypeScript
• Vite
• Tailwind CSS
• Node.js
• Express
• Prisma
• PostgreSQL
• Redis
• BullMQ
• Docker

Testing

A 44-test backend integration suite against a real PostgreSQL and Redis stack — including a tenant-isolation test that proves one organization can never see another's data — plus an 80-test frontend suite and a Playwright end-to-end suite driving a real browser through two simultaneous user sessions (an owner inviting a teammate, and the teammate accepting).