Banking API Integration for a Fintech Startup

Challenge

The client, a growing fintech startup, needed to integrate with multiple banking APIs to offer real‑time payment processing, balance checks, and transaction history. Their existing solution was slow (average transaction time >5 seconds), had frequent downtime, and cost them heavily due to inefficient API calls.

Solution

We designed and implemented a unified API gateway that:

• Connected to 3 major banks via REST APIs with OAuth2 authentication
• Intelligent caching reduced redundant calls by 60%
• Auto‑scaling infrastructure on AWS to handle traffic spikes
• Real‑time monitoring and alerting with 24/7 support

Results

• Transaction processing time reduced from 5+ seconds to under 3 seconds (40% improvement)
• Achieved 99.99% uptime (from 98.5% previously)
• API call costs reduced by 30% through caching and request optimisation
• Client’s customer satisfaction score increased by 25%

Technology Stack

Node.js, Express, Redis, AWS (EC2, RDS, CloudWatch), OAuth2, JWT, PostgreSQL, Docker.

← Back to Case Studies Discuss Your Project