Replacing Legacy Mainframe Fraud Systems in 90 Days
Modernizing mainframe systems for a large bank to enable real-time fraud detection using microservices architecture, reducing processing time from days to milliseconds.
Replacing Legacy Mainframe Fraud Systems in 90 Days
Modernizing mainframe systems for a large bank to enable real-time fraud detection using microservices architecture, reducing processing time from days to milliseconds.
Transforming Data Accessibility
The project had a predetermined timeline of three months, with the aim of developing a Proof Of Concept (POC) to replace the bank's mainframe with a modern microservices architecture. Several delays occurred due to access restrictions and strict security policies. The mainframe apps had been developed over several years, with limited documentation, making analysis difficult.
Decoding Legacy Systems Under Tight Deadlines
The mainframe applications were complex and heavily customized. Understanding the system, analyzing transaction flows, and designing a microservices replacement under tight timelines required a strategic approach and careful planning.
Approach to Modernization
Edstem studied legacy mainframe apps and designed a scalable microservices architecture. Two architectural patterns were explored: Choreography and Orchestration. The final system adopted an orchestrator to manage synchronous workflows, connecting multiple services via REST APIs.
Technology Stack
Microservices-Based Architecture
To modernize the bank's mainframe systems, Edstem proposed a scalable, cloud-ready microservices design. Services were built with Java Spring Boot and communicated via message queues. The POC demonstrated a single transaction type from end to end with Falcon scoring server integration.
Self-Service Analytics
Empower every team member to access, analyze, and visualize data without technical expertise
Real-Time Updates
Transactions are processed in real time using Falcon scoring, with throughput throttling and retry handling to ensure reliability.
Enterprise Security
Bank-grade security with role-based access control and comprehensive audit trails
Event-Driven Processing
Reliable ingestion and processing using message queues
Real-Time Scoring
Falcon fraud detection engine integration for instant transaction decisions
Secure Communication
REST API microservices with enterprise-grade security
Orchestrator Pattern
Centralized workflow management enabling synchronous transaction processing
Results That Matter
Despite multiple challenges, Edstem delivered the solution architecture and a working POC with all features on time. Modernizing legacy systems with microservices improved efficiency, scalability, and customer experience.
Before
- Legacy COBOL mainframe applications
- 3-5 days for system changes
- Limited scalability and high costs
- Difficult to maintain and update
After
- Modern microservices architecture
- Hours for deployment with CI/CD
- Horizontal scalability with Kubernetes
- Easy maintenance with Spring Boot
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