Interactive code editor with Python execution in the browser (via Pyodide)
Run and submit solutions with instant feedback on test cases
Supports all problem types: simple functions, trees, linked lists, and class-based designs
Curated collection of coding interview questions
Detailed explanations with approach, intuition, and complexity analysis
Common pitfalls and key takeaways for each question
Multiple solution implementations (optimal and alternative approaches)
Filter by difficulty, category, and algorithmic pattern
Links to LeetCode for practice

Tech Stack

Backend: FastAPI, SQLAlchemy, PostgreSQL, Alembic
Frontend: Next.js 15, React, TypeScript, Tailwind CSS
Infrastructure: Docker, Docker Compose

Quick Start

Prerequisites

Docker and Docker Compose
Python 3.12+ (for local backend development)
Node.js 20+ (for local frontend development)

Using Docker (Recommended)

# Set required environment variable
export POSTGRES_PASSWORD=your_secure_password

# Start all services
docker compose up

# Access the application
# Frontend: http://localhost:3000
# API: http://localhost:8000
# API Docs: http://localhost:8000/docs

Local Development

Start the database:

export POSTGRES_PASSWORD=your_secure_password
docker compose up db

Set up the backend:

cd backend
cp .env.example .env
# Edit .env with your database credentials
pip install -e ".[dev]"
alembic upgrade head
python scripts/load_data.py
uvicorn src.main:app --reload

Set up the frontend:

cd frontend
npm install
npm run dev

Project Structure

codetutor/
├── backend/           # FastAPI application
│   ├── src/           # Source code
│   ├── alembic/       # Database migrations
│   ├── data/          # Question content (YAML)
│   ├── scripts/       # Data loading utilities
│   └── tests/         # Backend tests
├── frontend/          # Next.js application
│   └── src/           # Source code
└── docker-compose.yml # Development environment

API Documentation

Once running, access the interactive API documentation at:

Swagger UI: http://localhost:8000/docs
ReDoc: http://localhost:8000/redoc

Content

Questions are organised by:

Categories: Arrays, Strings, Hash Tables, Linked Lists, Trees, Graphs, Dynamic Programming, Binary Search, Sorting, Stack, Queue, Heap, Two Pointers, Recursion, Math

Patterns: Two Pointers, Sliding Window, Fast & Slow Pointers, Binary Search, BFS, DFS, Backtracking, Dynamic Programming, Greedy, Monotonic Stack, Heap, Union Find, Trie

License

MIT