MiniBank Transaction Engine

A backend banking simulation built with Java and Spring Boot, modelling core transaction logic used in real financial systems.

Features

• Account creation and management
• • Fund transfers with balance validation
  • • Transaction history and audit trail
    • • Overdraft protection and error handling

      • • RESTful API endpoints following banking domain patterns

        • Tech Stack

        • • Language: Java 17
          • • Framework: Spring Boot
            • • Database: MySQL / H2 (in-memory for dev)
              • • Build tool: Maven

                • • API: REST

                  • Getting Started

                  • git clone https://github.com/29rules/minibank-transaction-engine
                    cd minibank-transaction-engine
                    mvn spring-boot:run

                    API Endpoints

                    Method	Endpoint	Description
                    POST	/accounts	Create account
                    GET	/accounts/{id}	Get account details
                    POST	/transfers	Transfer funds
                    GET	/transactions/{accountId}	Get transaction history

                    Why I built this

                    To apply Java + Spring Boot skills in a domain I know deeply from 5+ years at Scotiabank — financial transaction systems, validation rules, and audit logging.