PayFlow

A UPI-inspired backend payment platform built using Spring Boot Microservices.

The project demonstrates distributed system design, service discovery, API Gateway, JWT authentication, inter-service communication, distributed tracing, containerization, and orchestration.

Tech Stack

• Java 25
• Spring Boot
• Spring Cloud
• Spring Security
• JWT Authentication
• Eureka Naming Server
• Spring Cloud Gateway
• OpenFeign
• Spring Data JPA
• MySQL
• Docker
• Kubernetes
• Zipkin & Micrometer
• Resilience4J

Architecture

System Architecture

Services

• Auth Service
• User Service
• Account Service
• Payment Service
• Notification Service
• API Gateway
• Config Server
• Eureka Naming Server

Features

• JWT Authentication
• User Registration
• Bank Account Management
• Money Transfer
• Transaction History
• Service Discovery
• API Gateway Routing
• Distributed Tracing
• Circuit Breaker
• Retry Mechanism
• Rate Limiting
• Dockerized Deployment
• Kubernetes Deployment

Roadmap

Phase 1 (Core Microservices)

• System Design
• Config Server
• Eureka Server
• API Gateway
• JWT Authentication
• User Service
• Account Service
• Payment Service
• Notification Service

Phase 2 (Reliability & Deployment)

• Zipkin
• Resilience4J
• Docker
• Kubernetes

Phase 3 (Advanced Features)

• Kafka
• Redis
• OAuth2

Future Enhancements

• Kafka
• Redis
• OAuth2
• Prometheus
• Grafana

Author

Himanshu Singh