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Projects

Aureus

The problem

Keeping expenses, recurring payments and tasks in separate apps made it hard to see the month at a glance.

What was built

A single app with the balance, the month's spending by category, pending payments and their calendar forecast, the dollar exchange rate, a task list and a deep-work timer.

Technical details

React Native without Expo, on the New Architecture, with strict TypeScript, Zustand and SQLite (op-sqlite). Everything is local, with no backend. Each dollar transaction stores the exchange rate for its date. Today’s rate and the history come from public APIs, with a three-level cache (memory, SQLite and network with a timeout) and fallback values when offline.

Recurring payments (monthly, yearly or in installments) generate their pending entries idempotently. Monthly ones in pesos suggest the last confirmed amount, because with inflation it’s a better estimate than the original one. It has a native Kotlin widget that reads tasks from SQLite, and CI publishes the APK to GitHub Releases.

Tour · Aureus

An expense in pesos is entered with its category, and the balance updates right away. In the payment forecast, tapping a future day shows how much is due by then and what's left. Then the task list and a 25-minute focus session, where the day's tasks get checked off.

Technologies

  • React Native
  • TypeScript
  • Zustand
  • SQLite
  • Kotlin