🧩 System Overview
High-Level Architecture
TechTonic is built using a modular, layered architecture that separates concerns clearly:
Frontend (Flutter) — The client-side app responsible for UI rendering, navigation, and interaction with backend APIs.
Backend (Node.js + Express) — The server-side REST API managing authentication, business logic, data processing, and serving content.
Database (MongoDB) — NoSQL document store for persisting users, courses, lessons, certificates, and transactions.
Media Storage (Cloudinary) — Dedicated cloud service for storing and serving media assets (videos, PDFs, images).
DevOps & Deployment — CI/CD pipelines automate testing and deployment, while Docker ensures consistent environments.
Component Interactions
User Requests: Users interact with the Flutter app to browse courses, watch lessons, and manage profiles.
API Communication: The app sends RESTful API requests to backend endpoints for all data operations.
Authentication & Authorization: User credentials and tokens are validated on each request to secure endpoints based on roles.
Database Operations: Backend queries MongoDB for read/write operations with optimized schema design.
Media Delivery: Media files are uploaded, stored, and delivered via Cloudinary with CDN support for speed.
Server-Side Rendering: Backend supports server-rendered pages (where applicable) to improve SEO and initial load times.
Technology Stack Recap
Frontend
Flutter, Dart
Backend
Node.js, Express.js
Database
MongoDB
Media Storage
Cloudinary
CI/CD & Deployment
GitHub Actions, Docker
Why This Architecture?
Scalability: Each component can scale independently to handle increasing users and content.
Maintainability: Clear separation of concerns makes development, debugging, and upgrades easier.
Performance: Server-side rendering and CDN-backed media delivery ensure a smooth, fast experience.
Security: Role-based access control and token authentication secure sensitive data and APIs.
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