Starting a career in backend development is a challenge, because the competition among juniors is high. Employers want to see a candidate who not only “knows the language,” but also understands the basics of server logic, working with databases, and can learn quickly. Let's analyze what exactly is included in the requirements for a junior backend developer and how to prepare.
🔹 1. Fundamentals of the programming language
For Python, Java, Go or other languages, it is important not only to know the syntax, but also to be able to solve problems.
Variables, data types, operations.
Conditions, cycles, functions.
Working with collections (lists, arrays, dictionaries).
Basics of OOP: classes, inheritance, encapsulation.
🌐 2. Understanding client-server architecture
A backend developer must understand how the Internet works:
HTTP requests (GET, POST, PUT, DELETE).
Server response codes (200, 400, 500).
Protocols and REST API.
HTTP response codes table
Code | Description | Example of a situation |
|---|---|---|
200 | OK | Successful request |
404 | Not Found | Requested resource not found |
500 | Internal Server Error | Server error |
💾 3. Databases and SQL
Employers expect that Jun:
Can write simple SQL queries (
SELECT,INSERT,UPDATE,DELETE).Understands what indexes and keys are (PRIMARY, FOREIGN).
Can configure a connection to the database via ORM (for example, SQLAlchemy or Django ORM).
SELECT name, email FROM users WHERE is_active = 1;⚙ 4. Popular frameworks
Even a newbie needs to know the basics of one of the popular tools:
For Python: Django, Flask, or FastAPI.
For JavaScript (Node.js): Express.js, NestJS.
For PHP: Laravel or Symfony.
Table of popular frameworks
Language | Frameworks | Features |
|---|---|---|
Python | Django, FastAPI | Django — "everything out of the box", FastAPI — speed |
Node.js | Express, NestJS | Express — minimalism, NestJS — structure |
PHP | Laravel, Symfony | Laravel — a convenient start, Symfony — flexibility |
🛠 5. Developer tools
Git: creation of branches, commits, merge.
Docker: understanding how to package an application.
Linux commands: work with the terminal.
Postman: API testing.
🧪 6. Testing and debugging
Basics of modular testing (pytest, unittest).
Logging and debugging errors.
Understanding why tests are needed and how they help the team.
📋 7. Soft skills and HR requirements
Ability to work in a team (Git, Trello, Jira).
Competent communication — explain the code and problems.
Fast learning and adaptability.
🚀 How to prepare for an interview?
Create GitHub portfolio (mini-projects: ToDo API, parser, blog on Django).
Master basic algorithms and solve problems (Codewars, LeetCode).
Go through 2-3 trial interviews (for example, on mock-interviews platforms).
In the attachment Code There are Python and backend courses, as well as projects where you can create your own API and test it. This is a great base for starting and preparing for real tasks.
In addition, we have Telegram channel, where we share fresh articles, interview analysis, and useful materials for juniors. This is a great way to stay in shape and get advice from experienced developers.