Online exam system | Java Full Stack application

Published: 23 June 2026
on channel: The Sixth Bit

🚀 Just shipped my latest full-stack project: an Online Examination Platform.

Rather than just building another CRUD app, I wanted to tackle real-time data flow, stateless security, and role-based access control. Here is a deep dive into the architecture and technical decisions behind the system:

⚙️ Architecture & Backend (Java / Spring Boot 3 / PostgreSQL) • Security First: Implemented stateless authentication using Spring Security and JWT. Custom filters intercept requests to validate tokens, ensuring secure access to role-specific endpoints (Admin, Teacher, Student). • Real-Time Bidi-Communication: Integrated STOMP WebSockets over SockJS. When a student submits an exam, a message broker pushes the event directly to the teacher's dashboard for live monitoring—no constant HTTP polling required. • Data Layer: Utilized Spring Data JPA (Hibernate) for complex relational mapping between Users, Classrooms, Exams, and Submissions. Engineered for smooth transitions between H2 (local development) and PostgreSQL (production).

💻 Frontend (React 18 / Vite) • State & API Management: Built a robust API layer using Axios Interceptors to automatically attach JWT tokens to outgoing requests and gracefully handle 401 unauthorized expirations. • Security Measures: Engineered a "Strict Mode" during exams that hooks into browser visibility APIs and clipboard events to prevent tab-switching and copy-pasting. • Dynamic UI: Developed distinct, role-based dashboards utilizing React Router for protected route guarding.

🚢 DevOps & Deployment • Completely containerized using Docker and deployed on Render utilizing a Blueprint render.yaml for infrastructure-as-code, connecting the backend Web Service with a managed PostgreSQL instance and serving the frontend as a Static Site.

This project was a fantastic challenge in managing full-stack state, handling real-time socket connections, and enforcing strict security parameters.

🌍 Live Demo: https://online-exam-frontend-ltgy.onr...

I’m currently looking for new opportunities in Software Engineering! If you have any feedback on the tech stack or architecture, I’d love to discuss it below. 👇

#SoftwareEngineering #SystemArchitecture #Java #SpringBoot #React #WebSockets #PostgreSQL #FullStack #DeveloperPortfolio

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