1657 interview questions for Back-end developer (2025)

103 votes4019 runs

46 votes3680 runs4 comments

45 votes3256 runs0 comment

36 votes1946 runs1 comment

34 votes2044 runs1 comment

32 votes2958 runs

Pierreat Sep 19, 2022

28 votes3790 runs

Camilleat Apr 27, 2023

24 votes782 runs1 comment

authentication

Damienat Sep 6, 2023

22 votes2328 runs0 comment

19 votes3212 runs0 comment

18 votes3128 runs1 comment

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16 votes3427 runs

control flow

Thomas De verdièreat Dec 16, 2021

16 votes3193 runs0 comment

16 votes2763 runs0 comment

Anonymous authorat Dec 21, 2021

15 votes2820 runs2 comments

Anonymous authorat Dec 21, 2021

14 votes3690 runs1 comment

Smaïne Millaniat Dec 3, 2021

14 votes1577 runs

13 votes3974 runs

conditionals

Adrienat Mar 30, 2022

13 votes3432 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