1639 interview questions for Back-end developer (2025)

97 votes3781 runs5 comments

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Pierreat Sep 19, 2022

24 votes3586 runs

Camilleat Apr 27, 2023

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Théoat Mar 28, 2022

21 votes671 runs1 comment

authentication

Damienat Sep 6, 2023

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control flow

Thomas De verdièreat Dec 16, 2021

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Anonymous authorat Dec 21, 2021

15 votes2737 runs2 comments

Anonymous authorat Dec 21, 2021

14 votes3659 runs1 comment

Smaïne Millaniat Dec 3, 2021

13 votes1376 runs

12 votes3290 runs1 comment

serialization

Thomas De verdièreat Jan 4, 2022

12 votes3243 runs0 comment

Thomas De verdièreat Jan 4, 2022

1639 interview questionsfor Back-end developer (2025)

Test your technical skills before an interview of Back-end developer with 1639 corrected questions. Beginner, Intermediate or Expert level.

1639 interview questionsfor Back-end developer (2025)

Test your technical skills before an interview of Back-end developer with 1639 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

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?

Update a column in an SQL table

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