Case study
Problem
Users needed a reliable way to purchase mobile and digital top-ups online — with payment verification and instant fulfillment instead of manual processing.
Solution
Built a fintech platform with user accounts, payment integration, automated order routing, and an admin panel for monitoring transactions.
Technical challenges
- Handling payment state transitions without duplicate charges or lost orders
- Queue-based order fulfillment with retry logic for external API failures
- Securing user wallet balances and transaction history in PostgreSQL
Live
Status
Multi-gateway
Payment flows
Redis
Order queue
FastAPI
API framework
Tech stack
Python
FastAPI
PostgreSQL
Redis
Jinja2