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Expense Management System
2025
Full-stack developer & system architect
6 weeks
Project Overview
A comprehensive Expense Management System built to eliminate manual reimbursement workflows. It automates expense submission, multi-level approvals, conditional approval rules, and receipt scanning using OCR. Designed for organizations seeking transparency, accuracy, and efficiency in financial workflows. It includes a sophisticated approval engine that can be configured by admins.
Key Features
- •Auto-create company and admin account on signup
- •Role-based access: Admin, Manager, Employee
- •Multi-level approval workflow (Manager → Finance → Director)
- •Conditional approval logic with percentage and specific approver rules
- •Employee expense submission with support for multi-currency
- •Manager/Admin panels for approvals with comments
- •OCR-powered receipt scanning to extract expense details automatically
- •Reporting relationships for departments/teams
- •View expense statuses: Pending, Approved, Rejected
Challenges & Solutions
Building a flexible approval engine that can handle complex organizational hierarchies and conditional rules. Ensuring reliable OCR extraction from various receipt formats.
Technical Architecture
Uses a decoupled MERN stack architecture with a focus on scalability. Employs Tesseract.js for client-side OCR and integrates with various financial APIs for currency management.
Technologies
Node.jsExpress.jsReact.jsTailwind CSSMaterial UIMongoDBPostgreSQLJWT AuthenticationTesseract.jsREST Countries APIExchangeRate API
Project Links
Key Highlights
- #OCR automation for extracting amount, date, category, and vendor
- #Dynamic approval logic using configurable rules
- #Organizational hierarchy with user role assignment
- #Integration with country/currency APIs
- #Scalable backend structure with clean separation of concerns