1657 interview questions for Back-end developer (2025)

103 votes4020 runs

47 votes3681 runs4 comments

45 votes3265 runs0 comment

37 votes1950 runs1 comment

34 votes2046 runs1 comment

32 votes2965 runs

Pierreat Sep 19, 2022

28 votes3791 runs

Camilleat Apr 27, 2023

24 votes786 runs1 comment

authentication

Damienat Sep 6, 2023

22 votes2335 runs0 comment

19 votes3219 runs0 comment

18 votes3133 runs1 comment

17 votes3235 runs0 comment

16 votes3428 runs

control flow

Thomas De verdièreat Dec 16, 2021

16 votes3200 runs0 comment

16 votes2765 runs0 comment

Anonymous authorat Dec 21, 2021

15 votes2822 runs2 comments

Anonymous authorat Dec 21, 2021

14 votes3690 runs1 comment

Smaïne Millaniat Dec 3, 2021

14 votes1584 runs

13 votes3975 runs

conditionals

Adrienat Mar 30, 2022

13 votes3434 runs1 comment

serialization

Thomas De verdièreat Jan 4, 2022

1657 interview questionsfor Back-end developer (2025)

Test your technical skills before an interview of Back-end developer with 1657 corrected questions. Beginner, Intermediate or Expert level.

1657 interview questionsfor Back-end developer (2025)

Test your technical skills before an interview of Back-end developer with 1657 corrected questions. Beginner, Intermediate or Expert level.

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

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

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

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:

What is the purpose of the Laravel Sanctum tool?

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

Select only distinct values in a column using SQL

Update a column in an SQL table

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?

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?

Write a Javascript code that displays 'Adversity is not to be feared' and 'There is potentially a real danger'

Serialization can be customized with the Externalizable interface