Building a Banking API with Spring Boot and PostgreSQL. Focused on layered architecture, ACID transactions, and clean exception handling. Security is next. Learning a lot about how real enterprise backends are structured.
Mora
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Bank_system_simple
A secure Banking API built with Java, Spring Boot, and PostgreSQL. Layered architecture, ACID transactions, & enterprise
README
Banking API
A secure, production-ready Banking API built with Java and Spring Boot. Designed with enterprise architecture in mind — layered structure, ACID transactions, and a focus on data integrity.
🏗️ Architecture
This project follows a Layered Architecture (Controller → Service → Repository → Entity).
✨ Features
Core Banking
- Customer Management — Register, login, update profile, change password
- Account Management — Open, view, update status, close accounts
- Transactions — Deposit, withdraw, transfer, view history
- Data Integrity — ACID transactions using
@Transactional - Money Precision —
BigDecimalfor all monetary values
Architecture & Design
- Layered Architecture — Clean separation of concerns
- DTOs & Mappers — Entity ↔ DTO conversion
- Exception Handling — Global handler with custom exceptions
- Validation —
@Valid,@NotBlank,@Email,@Size - Pagination —
Pageableon all list endpoints - Custom IDs —
customerCode,accountCode,transactionCode(non-guessable)
🛠️ Tech Stack
| Layer | Technology |
|---|---|
| Language | Java 17 |
| Framework | Spring Boot 3.x |
| Security | Spring Security + JWT |
| Database | PostgreSQL |
| ORM | JPA / Hibernate |
| Build | Maven |
| Version Control | Git |
📌 Status
🚧 In Development — Core features are built. Security and deployment are next.
Built with Java, Spring Boot, and PostgreSQL. MIT License