virtual bank Backend

During my internship at EJADA, I had the chance to design and implement a Virtual Banking System using a fully microservices-based architecture. It was a challenging and rewarding experience that deepened my understanding of scalable backend development and distributed systems.

Tech Stack:

Java | Spring Boot | Eureka Server | Kafka | Docker | WSO2 API Gateway | MySQL | Feign | Swagger | Postman

? Microservices Overview

User Service – User registration, authentication, and profile management with secure password handling

Account Service – Account creation, balance tracking, and scheduled deactivation for idle accounts

Transaction Service – Processes money transfers and ensures consistency across services

BFF (Backend-for-Frontend) – Aggregates user/account/transaction data using WebClient calls

Logging Service – Collects structured logs from all services via Kafka for monitoring and auditing

WSO2 API Gateway – Manages and secures external API traffic using OAuth2, API keys, and service discovery with Eureka

? What I Learned:

Built RESTful APIs with secure, modular design

Containerized and deployed services using Docker

Used Eureka for service discovery and load balancing

Logged system-wide events using Kafka

Secured APIs with WSO2 API Gateway

Created a BFF layer to optimize frontend integration

Attached is a short demo video where I test key APIs and show The APIs created in WSO2 .