Complete Credit Card Management System

A modular monolith powering end-to-end credit card lifecycle management with 12 domain modules, maker-checker workflows, and multi-tenant isolation.

• 270+ REST API endpoints
• Maker-checker approval workflows
• Multi-tenant with row-level security
• AES-GCM field-level encryption
• Liquibase database migrations
• Full audit trail on every entity

ISO 8583 Multi-Network Processing

Standalone card network switch service handling real-time transaction processing across Visa, Mastercard, and RuPay networks via ISO 8583 messaging.

• Visa VisaNet integration (15 handlers)
• Mastercard MDES token lifecycle
• RuPay NPCI processing (11 handlers)
• Netty TCP server on port 8585
• jPOS ISO 8583 message parsing
• Real-time authorization & clearing

Secure Edge Routing & Traffic Management

Spring Cloud Gateway providing centralized authentication, rate limiting, circuit breaking, and intelligent routing for all platform services.

• JWT token validation & propagation
• Redis-backed rate limiting
• Resilience4j circuit breaker
• CORS and security headers
• Request correlation IDs
• Health check aggregation

Multi-Channel Alert & Communication

Event-driven notification service consuming banking events via Kafka and delivering alerts through email, SMS, and push notification channels.

• Email, SMS, and push notifications
• 17 Kafka event consumers
• Template-based rendering
• User preference management
• Delivery tracking & retry
• Multi-tenant channel config

Real-Time Insights & Data Export

Analytics service built on TimescaleDB for time-series aggregation, providing dashboards, scheduled reports, and multi-format data export.

• TimescaleDB time-series analytics
• Interactive dashboards
• CSV, PDF, and Excel export
• Scheduled report generation
• Multi-tenant data isolation
• Configurable date ranges