FinTech
Cnergy Fuel Card Mobile Platform Backend Infrastructure
Cnergy
Designed and built the backend infrastructure for a fuel card mobile platform supporting authentication, wallet operations, real-time transaction updates and scalable API services for a rapidly growing user base.
Results
Challenge
The platform required a backend capable of serving tens of thousands of users while supporting low-latency transaction updates, secure authentication and horizontally scalable infrastructure. Wallet balance updates needed to reflect instantly across devices without hammering the database with polling requests.
Our Solution
Implemented a FastAPI backend with Redis caching, MySQL persistence, Dockerized services and Terraform-managed infrastructure. WebSockets were introduced for real-time transaction and wallet updates while maintaining scalable API performance. Redis handled session state and rate limiting, keeping the core database free for transactional writes.
Outcome
Delivered a production-ready backend architecture capable of supporting approximately 70,000 users with real-time communication, infrastructure automation and reliable API services, built to scale horizontally as the user base grows.
Key Features
Benefits
Infrastructure that scales with growth
Terraform-managed provisioning means new environments and capacity increases are reproducible and fast, instead of manual server setup.
Instant transaction visibility
WebSocket-driven updates mean users see wallet changes the moment they happen, rather than waiting on manual refreshes or polling delays.
Tech Stack
Your next platform deserves a team that ships it properly.
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