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GradeFlow is a comprehensive, production-ready exam grading management system built as a full-stack desktop application. It demonstrates expertise in modern desktop development, RESTful API design, database modeling, and creating intuitive user interfaces for educational institutions.
System Architecture
Three-Tier Architecture
┌─────────────────────────────────────┐
│ Presentation Layer (React) │ ← User Interface
├─────────────────────────────────────┤
│ Application Layer (NestJS API) │ ← Business Logic
├─────────────────────────────────────┤
│ Data Layer (MongoDB) │ ← Data Persistence
└─────────────────────────────────────┘
Technology Stack
Backend Technologies
Framework: NestJS 10 (Node.js/TypeScript)
Language: TypeScript 5.0
Database: MongoDB
ORM: Mongoose 7.4
Validation: Class-validator & Class-transformer
Architecture: Modular, MVC pattern
API: RESTful design
Frontend Technologies
Framework: React 18 (Functional Components + Hooks)
Routing: React Router DOM 6
HTTP Client: Axios
Charts: Recharts (data visualization)
Icons: React Icons
Styling: Custom CSS with CSS Variables
Design: Responsive, mobile-first approach
Development Tools
Version Control: Git-ready structure
Package Manager: npm
Build Tools: React App, NestJS CLI
Code Quality: TypeScript strict mode, ESLint compatible
Key Technical Features
1. Backend Architecture
Modular Design Pattern
Three independent modules: Students, Exams, Grades
Each module follows single responsibility principle
Dependency injection for loose coupling
Service layer separation for business logic
Database Schema Design
typescript// Relational NoSQL design with references
Students Collection (Primary entities)
↓
Exams Collection (Scheduled assessments)
↓
Grades Collection (Performance records with foreign keys)
Schema Highlights:
Compound indexes for optimized queries
Reference integrity using ObjectId references
Automatic timestamps (createdAt, updatedAt)
Data validation at schema level
Unique constraints on critical fields
Advanced Features
Automatic grade calculation algorithm