Financial core
Wallets, transactions and splits, transfers, budgets, recurrences, reports, forecasts, reconciliation, and family membership.
01 · Web, mobile & MCP
Simply
Family Budget
A family-scoped budgeting system built around a Laravel API, React web app, Expo-based React Native mobile app, generated TypeScript SDK, read-only public API, and MCP server.
01
The project
One financial model, several purpose-built clients.
The project started as a shared household budget and grew into a multi-client system: a Laravel domain and API, a React web app, an Expo-based React Native app targeting iOS and Android, an OpenAPI-generated TypeScript SDK, a family-bound read-only public API, and a scoped MCP server.
The core constraints are explicit. Money is stored as integer cents, every financial record is family-scoped, projections use the family’s local time, and multi-step financial updates remain atomic.
Personal noteI use this project to explore how one careful domain can support very different interfaces without drifting into separate products.
02
Implemented areas
Client surfaces
The React web app and Expo-based React Native mobile app use the same family-scoped Laravel API through the generated TypeScript SDK.
Integrations
Google and Apple sign-in, OAuth, a family-bound read-only API for Home Assistant and personal dashboards, and scoped MCP tools.
03
Inside the product
Three views, one consistent model
Implementation
The system behind the product.
- BackendLaravel 12, PHP 8.2, MariaDB, Redis, queues, and scheduled jobs
- WebReact 19, TypeScript, Vite, TanStack Query, and a generated OpenAPI SDK
- MobileExpo 55, React Native 0.83, Expo Router, generated SDK, secure storage, and offline mutation sync
- MCP + APIExpress 5 Streamable HTTP MCP, OAuth 2.0 with PKCE and resource scopes, and a family-bound read-only public API
- DeliveryAutomated tests, static analysis, GitHub Actions server releases, EAS mobile builds, and rollback tooling