Milestone 4 Backend

Nest.js PostgreSQL Prisma ORM JWT Refresh Token

Backend API for financial account management with dual-token authentication, secure CRUD operations, and robust data validation.

Milestone 4 Backend

Financial Account Management API

Project Overview

The Milestone 4 Backend is a robust RESTful API built with Nest.js for managing personal financial accounts. It features a secure dual-token authentication system with JWT and refresh token rotation.

The system enables users to perform secure CRUD operations on their financial records while maintaining strict data integrity through Prisma ORM and comprehensive validation pipes.

Key Responsibilities

Dual-Token Authentication
Engineered a dual-token authentication system using JWT and Refresh Token rotation to ensure persistent and secure user sessions.
Account Management Services
Developed modular Account Management services that enable users to perform secure CRUD operations on personal financial records efficiently.
Database Schema Design
Architected a relational database schema using Prisma ORM to maintain strict data integrity between User entities and Accounts.
Data Validation & Error Handling
Implemented global data validation pipes and exception filters to standardize API responses and prevent malformed data from persisting.

Technical Highlights

Refresh Token Rotation

Implemented automatic refresh token rotation where each new access token comes with a new refresh token, enhancing security against token theft.

Modular Architecture

Built with Nest.js modular architecture for easy maintenance and scalability. Each module handles specific domain logic.

Project Information

Role
Backend Developer
Timeline
Nov, 2025 - Jan, 2026
Category
Backend Development
Project Type
RevoU Milestone

Tech Stack

Nest.js TypeScript PostgreSQL Prisma ORM JWT Railway

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Source Code

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