PrepAI — AI-Powered Interview Preparation Platform

Personalized questions, skill gap analysis, and a structured roadmap — all in one place.

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The Problem

Most job seekers don't fail interviews because they're not smart — they fail because their preparation is scattered, generic, and untracked.

Interview-AI fixes that.

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What It Does

You upload your resume. You describe yourself. The platform takes over from there.

• Generates technical and behavioral questions tailored to your actual background
• Gives you a 14-day day-by-day roadmap so you always know what to do next
• Runs a skill gap analysis against any job description — so you know exactly what to learn

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Screenshot

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Feature Breakdown

Authentication

• Secure signup/login with JWT
• Protected routes — no unauthorized access
• Session persistence across reloads

Resume + Profile Upload

• Upload PDF resume
• Add a short self-description of your goals and target role
• Data used to personalize every other feature

AI Question Generator

• Technical questions based on your skills and resume
• Behavioral questions based on your experience
• Questions refresh — not the same ones every time

14-Day Preparation Roadmap

• Structured daily plan from day 1 to day 14
• Each day has a clear goal and set of tasks

Skill Gap Analyzer

• Paste any job description
• Instantly see which skills you have vs. which you're missing
• Prioritized list so you know what to focus on first

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Tech Stack

Layer	Technology	Why
Frontend	React + Tailwind CSS	Fast UI, clean styling
Backend	Node.js + Express	REST API, lightweight
Database	MongoDB	Flexible schema for user profiles
AI	OpenAI API (GPT-4o)	Question generation + gap analysis
Auth	JWT + bcrypt	Stateless, secure
Hosting	Render	Free tier, fast deploy

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System Design (High Level)

User
  │
  ▼
Auth Service ──── MongoDB (Users)
  │
  ▼
Resume Parser
  │
  ▼
AI Engine (OpenAI) ──── Question Generator
                    └── Skill Gap Analyzer
  │
  ▼
Roadmap Generator ──── MongoDB (Progress)

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Getting Started

git clone https://github.com/your-username/prepai.git
cd prepai

# Backend
cd server
npm install
cp .env.example .env      # Add OPENAI_API_KEY, MONGO_URI, JWT_SECRET
npm run dev

# Frontend (new terminal)
cd ../client
npm install
npm run dev

Open http://localhost:5173

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Folder Structure

prepai/
├── client/               # React frontend
│   ├── src/
│   │   ├── pages/        # Auth, Dashboard, Roadmap, SkillGap
│   │   ├── components/   # Reusable UI components
│   │   └── api/          # Axios API calls
├── server/               # Express backend
│   ├── routes/           # auth, questions, roadmap, skillgap
│   ├── controllers/      # Business logic
│   ├── models/           # Mongoose schemas
│   └── middleware/       # Auth middleware
└── README.md

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What I Learned Building This

• How to design a full-stack app around a real user problem
• Prompt engineering for consistent, structured AI output
• Building stateless auth with JWT from scratch
• Handling async flows between resume parsing and AI generation

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Roadmap (What's Next)

• Mock interview with voice + AI feedback
• Company-specific question banks
• Progress analytics dashboard
• Browser extension for one-click job description import

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