Overview

End-to-end backend work connecting two of the country’s largest digital wallets — and personally responding to a live fraud attack in production.

Critical Production Incident

Identified a suspicious pattern in Splunk logs: rapid backend API calls executing high-value fraudulent transfers. Coordinated emergency system shutdown, then designed and deployed:

• Rate limiting on the interoperability API
• Enhanced API authentication
• Transaction velocity checks

Interoperability Platform

• Developed REST API enabling seamless money transfers between the two platforms, processing hundreds of thousands of transactions monthly
• Architected unified balance inquiry microservice consolidating legacy payment systems through intelligent routing — reducing redundant backend calls

Money-In Platform

• Built multi-channel money-in platform integrating 6+ payment providers: OTC, kiosks, bank transfers, remittance centers
• Developed Spring Batch application for automated daily merchant transaction reports
• Implemented Jenkins CI/CD quality gates across 5 refactored microservices

Tech

Java Spring Boot Spring Batch AWS (EC2, RDS, S3) Oracle DB Jenkins Splunk New Relic