Banking API System
Built secure, high-performance banking API system handling 1M+ daily transactions with 99.99% uptime and full PCI-DSS Level 1 compliance.
Results & Impact
The Challenge
FinanceFlow AG needed to modernize their legacy banking infrastructure to support their growing fintech platform. The existing system could only handle 100K transactions per day, had frequent downtime, and lacked proper security certifications. They needed a solution that could scale to millions of transactions while meeting strict regulatory requirements including PCI-DSS Level 1 compliance.
Our Solution
We built a microservices-based banking API using Node.js and PostgreSQL, deployed on Kubernetes for high availability. The system includes real-time transaction processing, fraud detection, multi-currency support, and comprehensive audit logging. We implemented end-to-end encryption, tokenization for sensitive data, and achieved PCI-DSS Level 1 certification. The architecture supports horizontal scaling and includes automated failover.
Technologies Used
Team Composition
- •2 Senior Backend Developers
- •1 DevOps Engineer
- •1 Security Specialist
- •1 QA Engineer
Project Timeline
Architecture & Planning
4 weeksKey Deliverables:
- ✓Microservices architecture design
- ✓Security requirements analysis
- ✓Technology stack selection
- ✓Compliance roadmap (PCI-DSS)
Core Development
20 weeksKey Deliverables:
- ✓Transaction processing engine
- ✓Account management APIs
- ✓Payment gateway integration
- ✓Fraud detection system
- ✓Multi-currency support
Security & Compliance
12 weeksKey Deliverables:
- ✓End-to-end encryption implementation
- ✓Security audit and penetration testing
- ✓PCI-DSS certification process
- ✓Compliance documentation
Deployment & Optimization
8 weeksKey Deliverables:
- ✓Kubernetes cluster setup
- ✓Load testing and optimization
- ✓Monitoring and alerting
- ✓Production deployment
- ✓Team training
Key Results & Achievements
- ✓99.99% uptime achieved (SLA exceeded)
- ✓1M+ transactions processed daily (10x increase)
- ✓PCI-DSS Level 1 compliant
- ✓50ms average API response time
- ✓Zero security incidents since launch
- ✓€500K annual cost savings from infrastructure optimization
Client Testimonial
"EuroStaff's backend team built a rock-solid API system that handles our entire banking infrastructure. Their expertise in Node.js, security, and scalability is unmatched. We couldn't have achieved PCI-DSS certification without them."
Anna Schmidt
Head of Engineering, FinanceFlow AG
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