full stack developer - AI integration

TELC Deutsch B2 Exam Platform - Detailed Analysis & Architecture

📋 Website Overview
What It Is:A comprehensive online learning platform for students preparing for the TELC (Goethe Institut) B2 German proficiency exam. It provides interactive exercises, AI-powered feedback, progress tracking, and subscription-based access control.
Target Users:
Students preparing for B2 German certification (high volume expected)
Language learners worldwide
Premium subscribers seeking comprehensive exam prep


2. User Management System
User authentication (signup/login)
Subscription tiers (Free/Premium)
Progress tracking per exercise
Performance analytics dashboard
Account settings & password management
3. Admin Dashboard
User management (view/edit/delete)
Subscription management (extend/revoke)
Content management (upload exercises)
Analytics (active users, revenue, expiring subscriptions)
Email campaign triggers
4. AI Integration
Writing feedback system (Schreiben section)
Automated emails (welcome, subscription updates, reminders, expiry)
Answer validation
Must-Have (Critical)
Secure Authentication System
Password hashing (bcrypt)
Email verification OTP
Database with Proper Schema
User accounts (credentials, subscription data)
Exercise questions & answers
User progress tracking
Audit logs
OTP/reset tokens
API Backend
Question delivery endpoints
Answer checking/validation
Progress saving
Subscription management
User analytics
Payment Processing
No online payment; just contact me or the admin on WhatsApp to activate the premium subscription and receive payment via the bank app or local money transfer agencies.
Subscription billing
Receipt emails
Email Service
Verification OTPs
Welcome emails
Subscription notifications
Password reset links
Exam tips/reminders

Also here's a link for watching an example https://drive.google.com/file/d/1KwLI6y9mpipwfjlkAFqXqbuKmOoCG522/view?usp=drive_link


I want dark and light mode, English, German, and Arabic languages, and this site will get high traffic.

i want to know where i can storage all those texts,images,audios and simply change them.
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