How to start writing backend in Python: Django and Flask

If the frontend is person application, then the backend is its Brain 🧠. This is where logic is born, data is stored, and all the wonders that the user does not see but feels happen. Let's figure out how to start your journey in backend development in Python and why frameworks Django and Flask became the most popular.

What is backend and why do you need it?

Backend is the internal part of the application that runs on the server.

She is responsible for:

• Data storage and processing - users, orders, messages.

• Business logic - what happens when you click "Buy".

• Exchange with the frontend — via API.

• Safety — authorization, access rights, data protection.

A backend developer creates this “brain” using languages like Python, Go, Java, PHPPython is especially popular here for its simplicity, speed, and huge number of libraries.

Why Python?

Python is a universal language that can be used to write everything from simple scripts to powerful web applications and artificial intelligence.

For the web, it has two powerful tools:

• Django — "all inclusive": ORM, admin panel, routes, authorization. Suitable for large projects and startups.

• Flask — a minimalist framework: only the basis, the rest you add yourself. A great option for training and small services.

Django: a quick start for big ideas

Django allows you to create a website literally for one evening. It has a built-in admin panel, a ready-made authorization system and a powerful ORM for working with the database.

from django.http import HttpResponse

def hello(request):
    return HttpResponse("Hello, world! 🌍")

You start the server - and now you already have the first page! Django takes over the infrastructure, leaving you with pure logic.

Flask: freedom and minimalism

Flask is like LEGO constructor: you collect only what you need. It gives you flexibility and teaches you to understand how a web server works from the inside.

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello():
    return "Hi Flask! 🧩"

if __name__ == "__main__":
    app.run()

Run this code and you'll have a mini-server up and running! Flask is often used for REST APIs, microservices, and architecture training.

What does a beginner backend developer need to know? What do you need to study?

• Python basics (functions, classes, files)

• HTTP and REST API principles

• Working with databases (PostgreSQL, SQLite) and ORM

• Authorization and security

• Docker and deploy — how to put a project on the Internet

Do you want to level up from scratch? Codice there are cool courses in Python and other languages — with practice, mini-projects and tests. You can start for free and chat with like-minded people in our Telegram channel 💬

Backend is logic, structure and magicthat brings any application to life. Python makes this path smooth and clear, while Django and Flask give you a choice — “out of the box” stability or the flexibility of minimalism.

Open the terminal, enter:

pip install django

or

pip install flask

and start your first backend today 💪

You can do it!