Urban Courier & Delivery System
Three panels on one database; balances derived from a ledger, deductions written in the delivery's own transaction.
Three interfaces for company management, partner businesses and couriers in the field. Orders move through a state machine, and the balance deduction is written only on delivery, inside the same transaction as the status change. Businesses top up a prepaid balance and may go negative to a defined limit. The courier app was written as native Android, with location sent by a foreground service that survives a locked screen.
Highlights
- Ledger-based balances — every unit of money traceable to its source
- Measured, uninterrupted location reporting on a locked screen
- Role read only from the server-side profile table
- Automatic order ingestion from food delivery platforms
- Client
- Courier company
- Year
- 2026
- Technologies used
- KotlinNative AndroidPostgreSQLRLSStored Procedures
Live address not shared
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