Client
Nusantara Bank
Timeline
December 2025
Scope
Fintech
Deliverables
- UI/UX Design
- Frontend Development
- Backend Architecture
The Challenge
Nusantara Bank was strangled by a 30-year-old legacy COBOL core. Transaction processing speeds were capped at 500 TPS (Transactions Per Second), causing frequent outages during "PayDay" traffic spikes. Furthermore, the monolithic architecture made it impossible to integrate with modern Open Banking APIs, causing them to lose market share to agile fintech startups.
The Solution
We executed a "strangler fig" migration strategy, systematically replacing the monolith with high-performance microservices written in Go. The new architecture ran on a geo-distributed Kubernetes cluster.
- Event-Driven Design: Utilized Apache Kafka to decouple transaction processing, ensuring immediate consistency.
- Real-Time Ledger: Replaced batch processing with a stream-based ledger for instant balance updates.
- API Gateway: Exposed secure endpoints for third-party fintech integrations.
The Impact
The transformation was absolute. The system now comfortably handles 50,000 TPS with sub-millisecond latency.
- Zero Downtime: Achieved 100% availability during the last annual audit.
- Innovation Speed: Deployment cycles for new features dropped from 3 months to 2 days.
- Real-Time Fraud Detection: The new streaming architecture catches suspicious transactions in under 200ms.
100%
Uptime Guaranteed
3x
Perf. Increase