• Delivered end-to-end payment integration solutions supporting ACH, domestic and international wire transfers, RTP networks, and FAST instant payments in Singapore, enabling reliable multi-rail money movement capabilities.

• Architected and operated event-driven microservices platforms leveraging Kafka and AWS messaging services (SNS/SQS) to support asynchronous transaction workflows and improve system resiliency.

• Built and maintained cloud-native payment processing services on AWS using Amazon EKS, Kubernetes, and Docker to support scalable and highly available financial infrastructure.

• Owned production reliability and observability for critical payment services through implementation of monitoring and service-level objectives (SLOs), improving incident response and system availability.

• Led modernization initiatives migrating legacy applications to cloud-native environments, transitioning integration patterns toward microservices and event-driven architectures on AWS.

• Provided technical leadership and mentorship to engineering teams on system design, debugging, and operational best practices.

• Leveraged agentic and AI-assisted development workflows (Claude, Cline) to accelerate solution design, implementation, and documentation while maintaining production-grade engineering standards.

Lead Software Engineer

• Contributed to development and enhancement of large-scale fraud and risk decisioning platforms including Visa Risk Manager (VRM), Advanced Authorization (AA), and Risk Message Processor (RMP) supporting real-time transaction monitoring across global payment networks.

• Supported AI-driven Advanced Authorization systems leveraging neural network–based transaction scoring models to detect fraudulent activity and assist issuer authorization decisions.

• Developed backend services for Risk Message Processor (RMP) using Java on Linux platforms, utilizing Cassandra for distributed storage and MQ-based messaging for real-time issuer alerting.

• Enhanced Visa Risk Manager (VRM) rule engine systems used by member banks to define transaction monitoring policies for fraud detection and alert generation.

• Contributed to Open VisaNet (OVN) open-systems transaction processing platform built using Golang on containerized Docker/Kubernetes infrastructure with Cassandra and Kafka-based messaging.

• Collaborated within onsite–offshore delivery model to support development and enhancement of high-throughput transaction processing systems requiring low-latency decisioning and high availability.

Worked with VISA Risk Systems team as part of this assignment.