Classroom Management System

Enterprise-grade attendance tracking for educational institutions

Overview

The Challenge

Educational institutions needed a robust system to track student attendance, generate reports, and manage classroom data efficiently across multiple devices.

The Solution

I architected a full-stack solution with Next.js frontend and Spring Boot backend, implementing JWT authentication and real-time data synchronization.

Architecture

Frontend: Next.js + TypeScript | Backend: Spring Boot + Java | Database: PostgreSQL | Auth: JWT + OpenSSL

Key Metrics

1000+ concurrent users

Concurrent Users

99.9% uptime

Reliability

60% time saved

Efficiency Gain

Technologies Used

Next.jsTypeScriptSpring BootJavaPostgreSQLJWTOpenSSLREST API

Code Deep Dive

JWT Authentication Middleware

Secure authentication layer that validates JWT tokens and manages user sessions with automatic token refresh.

// JWT Authentication Middleware
@Component
public class JwtAuthenticationFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        String token = extractTokenFromRequest(request);
        if (token != null && JwtUtil.validateToken(token)) {
            // Authentication logic here
        }
        filterChain.doFilter(request, response);
    }
}