PrepAI — AI-Powered Interview Coach

A full-stack AI interview preparation platform built with the MERN stack and Gemini AI.

Features

• 🎯 Role-based questions — SDET, SDE, Full Stack
• 🎙 Voice input using Web Speech API
• 📄 Resume PDF upload for personalised AI feedback
• 🤖 AI-generated questions, hints, and model answers
• 💬 Follow-up chat with AI coach after feedback
• 📊 Analytics dashboard — score trends, weak topics, strong topics
• 📋 Session history with filters and question bank (save favourites)
• 🏋 Full mock interview mode (5 questions)

Tech Stack

• Frontend: React.js, Recharts, React Dropzone
• Backend: Node.js, Express.js
• Database: MongoDB + Mongoose
• AI: Google Gemini 1.5 Flash API
• Voice: Web Speech API (browser native)
• PDF: pdf-parse
• Auth: JWT

Setup

Get Free Gemini API Key

1. Go to aistudio.google.com
2. Click "Get API Key" — completely free, no card needed

Backend

cd backend
npm install
# Update .env with your GEMINI_API_KEY and MONGO_URI
npm run dev

Frontend

cd frontend
npm install
npm start

.env (backend)

PORT=5001
MONGO_URI=mongodb://localhost:27017/prepai
JWT_SECRET=your_secret_key_min_32_chars
GEMINI_API_KEY=your_gemini_api_key
CLIENT_URL=http://localhost:3000