🚀 FastAPI with Python Interview Preparation

Your step-by-step guide to mastering FastAPI with Python, from basics to deployment, for building high-performance APIs and preparing for AI/ML and backend development interviews

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📖 Introduction

Welcome to the FastAPI with Python Roadmap! 🚀 This roadmap is designed to teach you how to build, test, and deploy high-performance APIs using FastAPI, a modern, fast (high-performance), web framework for building APIs with Python. It provides a structured learning path from setting up your first FastAPI application to deploying a production-ready API, with a focus on practical skills for AI/ML integration, backend development, and interview preparation. Aligned with the tech-driven era (May 3, 2025), this roadmap equips you with the expertise to create scalable APIs and enhance your portfolio for 6 LPA+ roles in backend or AI/ML development.

🌟 What’s Inside?

• FastAPI Basics: Setting up and building your first API.
• API Development: Creating endpoints, handling requests, and data validation.
• Advanced FastAPI Features: Authentication, middleware, and async programming.
• Testing and Documentation: Writing tests and generating API docs.
• Deployment and Scaling: Deploying APIs to production with Docker and cloud platforms.
• Hands-on Code: Five .md files with Python examples, visualizations, and a capstone project.
• Interview Scenarios: Key questions and answers for FastAPI and backend interviews.

🔍 Who Is This For?

• Backend Developers building RESTful APIs with Python.
• AI/ML Engineers integrating machine learning models with APIs.
• Software Engineers deepening expertise in modern web frameworks.
• DevOps Engineers learning API deployment and scaling.
• Anyone preparing for backend or AI/ML interviews in tech.

🗺️ Learning Roadmap

This roadmap covers five key areas of FastAPI development, each with a dedicated .md file, progressing from foundational to production-ready skills:

🛠️ FastAPI Basics (fastapi_basics.md)

• FastAPI Setup and First API
• Basic Endpoints and Responses
• Request Visualization

📝 API Development (api_development.md)

• Path and Query Parameters
• Data Validation with Pydantic
• Response Metrics Visualization

⚙️ Advanced FastAPI Features (advanced_features.md)

• Authentication and Authorization
• Middleware and Async Programming
• Performance Metrics Visualization

🧪 Testing and Documentation (testing_documentation.md)

• Unit and Integration Testing
• Automatic API Documentation
• Test Coverage Visualization

🚀 Deployment and Scaling (deployment_scaling.md)

• Dockerizing FastAPI Apps
• Cloud Deployment (e.g., AWS, Heroku)
• Scalability Metrics Visualization

💡 Why Master FastAPI with Python?

FastAPI is a leading framework for modern API development:

1. Performance: Asynchronous capabilities for high-speed APIs.
2. Ease of Use: Intuitive syntax and automatic documentation.
3. AI/ML Integration: Ideal for serving machine learning models.
4. Interview Relevance: Tested in backend and AI/ML coding challenges.
5. Industry Demand: Essential for backend and DevOps roles.

📆 Study Plan

• Week 1:
  • Day 1-2: FastAPI Basics
  • Day 3-4: API Development
  • Day 5-6: Advanced FastAPI Features
  • Day 7: Review Week 1
• Week 2:
  • Day 1-2: Testing and Documentation
  • Day 3-4: Deployment and Scaling
  • Day 5-7: Review .md files and practice interview scenarios.

🛠️ Setup Instructions

1. Python Environment:
   • Install Python 3.8+ and pip.
   • Create a virtual environment: python -m venv fastapi_env; source fastapi_env/bin/activate.
   • Install dependencies: pip install fastapi uvicorn pydantic pytest requests matplotlib pandas docker.
2. Running FastAPI:
   • Run a FastAPI app: uvicorn main:app --reload.
   • Access the app at http://localhost:8000 and docs at http://localhost:8000/docs.
3. Datasets:
   • Uses synthetic data (e.g., user data, API requests).
   • Optional: Download datasets from Hugging Face Datasets.
   • Note: Code uses simulated data to avoid file I/O constraints.
4. Running Code:
   • Copy code from .md files into a Python environment (e.g., fastapi_basics.py).
   • Use VS Code, PyCharm, or Google Colab.
   • View outputs in terminal, browser (Swagger UI), and Matplotlib visualizations (PNGs).
   • Check terminal for errors; ensure dependencies are installed.

🏆 Practical Tasks

1. FastAPI Basics:
   • Build and run a basic FastAPI app.
   • Visualize API request success rates.
2. API Development:
   • Create endpoints with Pydantic validation.
   • Plot request response times.
3. Advanced FastAPI Features:
   • Implement JWT authentication and async endpoints.
   • Visualize API performance metrics.
4. Testing and Documentation:
   • Write unit tests for API endpoints.
   • Visualize test coverage.
5. Deployment and Scaling:
   • Deploy a FastAPI app with Docker and AWS.
   • Plot scalability metrics (e.g., response times under load).

💡 Interview Tips

• Common Questions:
  • What are the advantages of FastAPI over Flask or Django?
  • How do you validate data in FastAPI?
  • How do you implement authentication in FastAPI?
  • How do you test FastAPI endpoints?
  • How do you deploy a FastAPI app to production?
• Tips:
  • Explain FastAPI setup with code (e.g., @app.get, Pydantic models).
  • Demonstrate use cases like ML model serving or REST APIs.
  • Code tasks like endpoint creation or error handling.
  • Discuss trade-offs (e.g., async vs. sync performance).
• Coding Tasks:
  • Build a FastAPI endpoint with Pydantic validation.
  • Write a test for a FastAPI endpoint using pytest.
• Conceptual Clarity:
  • Explain how FastAPI leverages async/await for performance.
  • Describe deployment strategies for scalable APIs.

📚 Resources

• FastAPI Documentation
• Pydantic Documentation
• Uvicorn Documentation
• Pytest Documentation
• Docker Documentation

🤝 Contributions

1. Fork the repository.
2. Create a feature branch (git checkout -b feature/amazing-addition).
3. Commit changes (git commit -m 'Add some amazing content').
4. Push to the branch (git push origin feature/amazing-addition).
5. Open a Pull Request.

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Happy Learning and Good Luck with Your Interviews! ✨