1640 interview questions for Back-end developer (2025)

97 votes3816 runs5 comments

44 votes3054 runs0 comment

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28 votes2802 runs

Pierreat Sep 19, 2022

25 votes3615 runs

Camilleat Apr 27, 2023

21 votes2197 runs0 comment

Théoat Mar 28, 2022

21 votes689 runs1 comment

authentication

Damienat Sep 6, 2023

19 votes3009 runs0 comment

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16 votes3321 runs

control flow

Thomas De verdièreat Dec 16, 2021

16 votes2993 runs0 comment

16 votes2683 runs0 comment

Anonymous authorat Dec 21, 2021

15 votes2747 runs2 comments

Anonymous authorat Dec 21, 2021

14 votes3661 runs1 comment

Smaïne Millaniat Dec 3, 2021

13 votes1410 runs

12 votes3330 runs1 comment

serialization

Thomas De verdièreat Jan 4, 2022

12 votes3270 runs0 comment

Thomas De verdièreat Jan 4, 2022

1640 interview questionsfor Back-end developer (2025)

Test your technical skills before an interview of Back-end developer with 1640 corrected questions. Beginner, Intermediate or Expert level.

1640 interview questionsfor Back-end developer (2025)

Test your technical skills before an interview of Back-end developer with 1640 corrected questions. Beginner, Intermediate or Expert level.

Understanding the differences between `map()` and `forEach()` methods in JavaScript

Write a SQL query to retrieve the list of employees with a salary greater than 5100.

Write a JavaScript function that fetches data from an API and logs it to the console.

Write a Python function that returns the factorial of a number.

Explain the difference between the `include` and `require` functions in PHP.

Write a Java program that prints 'welovedev'.

Fix the following Javascript loop:

Write a Python function that prints the elements of a list.

What is the purpose of the Laravel Sanctum tool?

Select only distinct values in a column using SQL

Write a SQL query to insert data into a table

Update a column in an SQL table

How many times is the condition `(a++ < 15)` evaluated in the following code? ```java int a = 3; while (a++ < 15) { if ((a++ % 5) == 0) break; } ```

Which SQL keyword is used to sort the result of a SELECT statement?

Explain the prototype scope in Spring

A bean with a `session` scope is injected into a bean with a` singleton` scope. What happens when the application starts?

What is the minimum PHP version for Symfony 5?

What is the difference between an interface and an abstract class in Java?

Serialization can be customized with the Externalizable interface

A monitor in Java