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🚀 Placement Preparation Hub

📂 Repository Overview

To maintain a well-organized, revision-friendly, and interview-ready collection of resources and solved problems for placements.

🚀 What This Repository Offers

  • ✅ Topic-wise DSA implementations & problems
  • ✅ Company-wise interview questions
  • ✅ System Design notes & case studies
  • ✅ Curated learning resources
  • ✅ Real interview experiences & takeaways

🎯 Who Is This For?

  • Students preparing for placements
  • Beginners building DSA fundamentals
  • Anyone targeting product-based companies

📁 Repository Structure

This repository serves as both a web platform for interactive placement preparation and a hub for curated content and resources.

Placement-Prep/
│
├── backend/                    # Backend server and API
│   ├── config/                 # Database and application configuration
│   ├── controllers/            # Route handlers for API endpoints
│   ├── middlewares/            # Authentication, error handling, and other middlewares
│   ├── models/                 # MongoDB schemas and data models
│   ├── routes/                 # API route definitions
│   └── utils/                  # Utility functions and helpers
│
├── src/                        # Frontend React application
│   ├── components/             # Reusable UI components (shadcn/ui based)
│   ├── hooks/                  # Custom React hooks
│   ├── layouts/                # Page layout components
│   ├── lib/                    # Utility libraries and configurations
│   └── pages/                  # Application pages and views
│
├── public/                     # Static assets (favicon, images, robots.txt)
│
├── Easy/                       # Placement preparation content
│   └── Medium/                 # Medium difficulty problems and solutions
│
├── package.json                # Frontend dependencies and scripts
├── vite.config.ts              # Vite build configuration
├── tailwind.config.ts          # Tailwind CSS configuration
├── tsconfig.json               # TypeScript configuration
└── README.md                   # This file

Note: The repository combines a full-stack web application for interactive learning with traditional content organization. Additional content directories (e.g., for Data Structures, Algorithms) are planned for future expansion.

📅 Study Plan

🗓️ 12-Week Placement Preparation Plan

12 Week Placement Preparation Roadmap

A structured 12-week roadmap covering DSA, System Design, and Interview Preparation, designed to ensure consistent progress and effective revision.

📊 Daily Study Schedule

🌅 Morning Session (2 Hours)

Focus: Strengthening basics & fixing weak areas

  • ⏱️ 30 mins — Theory Revision Revise core concepts (DSA, OS, DBMS, CN, etc.) to keep fundamentals strong.

  • 🧠 60 mins — Problem Solving Solve DSA problems (LeetCode / GFG / CodeStudio) with a focus on logic and patterns.

  • 🔁 30 mins — Previous Mistakes Review Analyze wrong solutions, optimize approaches, and note learnings.

☀️ Afternoon Session (2 Hours)

Focus: Learning & implementation

  • 📘 60 mins — New Topic Learning Learn a new concept or algorithm and understand its real‑world use cases.

  • 💻 30 mins — Coding Practice Implement newly learned concepts through hands‑on coding.

  • 📊 30 mins — Time & Space Complexity Analysis Analyze performance, optimize code, and compare multiple approaches.

🌙 Evening Session (1 Hour)

Focus: Interview preparation

  • 🎯 60 mins — Mock Interview / Company‑Specific Questions Practice behavioral + technical questions from product‑based companies.

📌 Consistency beats intensity. Follow this schedule daily and iterate weekly for maximum growth.

🎯 Interview Preparation

🔍 Technical Rounds

🧠 Coding Round

  • ⏱️ Solve 2–3 problems in 60–90 minutes
  • ⚙️ Focus on optimized solutions (Time & Space)
  • 🧼 Write clean, modular, and readable code
  • 🧪 Handle edge cases and explain trade-offs

🏗️ System Design Round

  • 📝 Requirements gathering (functional & non-functional)
  • 🔌 API design (RESTful endpoints, contracts)
  • 🗄️ Database schema (indexes, normalization)
  • 📈 Scalability (caching, sharding, load balancing)

📚 CS Fundamentals

  • 🧵 Operating Systems (Processes, Threads, Scheduling, Deadlocks)
  • 🧮 DBMS (SQL queries, Indexes, Transactions)
  • 🌐 Networking (TCP/IP, HTTP/HTTPS, DNS)

💼 Behavioral Round

  • ⭐ Use the STAR Method (Situation, Task, Action, Result)
  • 🧩 Prepare 5–7 strong stories from projects/internships
  • 🏢 Research company values & culture
  • ❓ Prepare thoughtful questions for the interviewer

📝 Resume Tips

  • ✍️ Start bullet points with action verbs
  • 📊 Quantify achievements (numbers > words)
  • 🎯 Tailor resume for each company/role
  • 📄 Keep it 1 page, clean and ATS-friendly

🛠️ Tech Stack

Frontend

  • React - UI library for building the user interface
  • TypeScript - Type-safe JavaScript for better development experience
  • Vite - Fast build tool and development server
  • Tailwind CSS - Utility-first CSS framework for styling
  • shadcn/ui - Modern UI components built on Radix UI
  • React Router - Declarative routing for React applications
  • React Query - Powerful data synchronization for React
  • Socket.io - Real-time bidirectional communication

Backend

  • Node.js - JavaScript runtime for server-side development
  • Express - Minimal and flexible Node.js web application framework
  • MongoDB - NoSQL database for flexible data storage
  • Mongoose - Elegant MongoDB object modeling for Node.js
  • JWT - JSON Web Tokens for secure authentication
  • Socket.io - Real-time, bidirectional and event-based communication

Other Tools

  • Git - Distributed version control system
  • ESLint - Tool for identifying and reporting patterns in JavaScript/TypeScript
  • Prettier - Code formatter for consistent code style

🚀 Full Project Setup Guide (For New Contributors)

Welcome 👋 Follow these steps carefully to set up the project locally.

🖥️ System Requirements

Make sure you have installed:

  • Node.js (v18 or higher recommended)
  • npm (comes with Node)
  • Git
  • MongoDB Atlas account
  • VS Code (recommended)

Check versions:

node -v
npm -v
git --version

📦 Project Structure

Placement-Prep/
   ├── frontend  (Vite + React + Firebase)
   └── backend   (Express + MongoDB + JWT)

🔹 Step 1: Clone Repository

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

🔹 Step 2: Frontend Setup

cd frontend
npm install

Required Frontend Packages (Auto installed via npm install)

  • react
  • vite
  • firebase
  • react-router-dom
  • socket.io-client
  • tailwindcss
  • framer-motion
  • react-hook-form
  • zod
  • recharts
  • etc.

Create .env file in frontend folder:

VITE_FIREBASE_API_KEY=your_api_key
VITE_FIREBASE_AUTH_DOMAIN=your_auth_domain
VITE_FIREBASE_PROJECT_ID=your_project_id
VITE_FIREBASE_STORAGE_BUCKET=your_storage_bucket
VITE_FIREBASE_MESSAGING_SENDER_ID=your_sender_id
VITE_FIREBASE_APP_ID=your_app_id

⚠️ All frontend env variables must start with VITE_

Run frontend:

npm run dev

Frontend runs on:

http://localhost:5173

🔹 Step 3: Backend Setup

Open new terminal:

cd backend
npm install

Required Backend Packages (Auto installed)

  • express
  • mongoose
  • dotenv
  • cors
  • bcryptjs
  • jsonwebtoken
  • helmet
  • morgan
  • socket.io
  • express-validator
  • compression

Create .env file in backend folder:

MONGODB_URI=mongodb+srv://username:password@cluster.mongodb.net/placementprep
PORT=5000
JWT_SECRET=your_secret_key

⚠️ Replace username and password with your MongoDB Atlas credentials.

🔹 Step 4: Run Backend

npm start

Backend runs on:

http://localhost:5000

🔹 Step 5: MongoDB Setup

  1. Go to MongoDB Atlas
  2. Create cluster
  3. Create database user
  4. Whitelist your IP (0.0.0.0/0 for development)
  5. Copy connection string

🔹 Step 6: Important Rules

  • Never push .env file
  • Never commit API keys
  • Always create a new branch before contributing
  • Follow project folder structure

🔹 Common Errors & Fix

❌ MONGODB_URI undefined

Check backend .env variable name

❌ Firebase not working

Check frontend .env and restart server

❌ Port already in use

Kill process:

sudo kill -9 $(lsof -t -i:5000)

🎯 Final Run (Both Servers)

Terminal 1:

cd frontend
npm run dev

Terminal 2:

cd backend
npm start

🚀 You're Ready to Contribute!

🤝 Contribution Guide

We welcome contributions! 🚀 Here’s how you can help:

✅ Add Solutions

  • Provide alternative approaches
  • Add time & space complexity
  • Include edge cases

📖 Improve Documentation

  • Fix typos and grammar
  • Add clearer explanations
  • Improve code comments

➕ Add New Content

  • Company-specific questions
  • Interview experiences
  • New problem solutions

🛠️ Steps to Contribute

# 1. Fork the repository
# 2. Create a new branch
git checkout -b feature/your-feature

# 3. Make your changes
# 4. Commit with a descriptive message
git commit -m "Add: Solution for Two Sum problem"

# 5. Push to your branch
git push origin feature/your-feature

# 6. Create a Pull Request

📞 Connect

GitHub LinkedIn LeetCode Email

🏆 Hall of Fame

Big thanks to all the awesome contributors who helped make this project better! 🙌
Your efforts help students prepare for placements with quality resources 🚀

Thank you to everyone who has contributed!

⭐ Support

If this repository helped you:

  • ⭐ Star the repository
  • 🔄 Share with friends
  • 🐛 Report issues
  • 💡 Suggest improvements

🚀 Happy Coding & Best Wishes for Your Interviews! 🎯
"The only way to learn coding is to write a lot of code and solve a lot of problems."

📄 License

This project is licensed under the MIT License — see the LICENSE file for details.

Made with ❤️ by Shubham

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