PROJECT FILE 02 / Full-stack & data integrity / Live project
Transaction Ledger
Every entry has a consequence.
An account workspace for credits, debits, and transfers — with exact balances and a clear transaction history. Useful on the surface. Careful underneath.
The problem
A friendly financial interface is only useful when the underlying numbers and state changes stay consistent.
What I built
- Built account creation, UUID lookup, and a responsive account workspace.
- Implemented exact balance handling, credit/debit processing, and atomic transfers.
- Connected filtered, paginated history and transfer receipts through shared TypeScript contracts.
Inside the engineering
Exact values, explicit contracts
Shared validation contracts connect the interface and API. Exact balance representation avoids using display rounding as the source of truth.
Receipts and uncertain retries
Transfer feedback distinguishes a committed receipt from an unresolved request. References help identify duplicate intent instead of silently performing it again.
What this demonstrates
Demonstrates full-stack product delivery with data correctness, transaction boundaries, and a readable account history.
- TypeScript
- React
- Express
- PostgreSQL
This capture is the public landing page and its illustrative account preview. It is not a real customer account. This project is a development demonstration, not a banking service.
SOURCE REVIEWED / 2026-11-07