1657 interview questions for Back-end developer (2025)

102 votes4007 runs

46 votes3670 runs4 comments

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32 votes2954 runs

Pierreat Sep 19, 2022

28 votes3778 runs

Camilleat Apr 27, 2023

24 votes779 runs1 comment

authentication

Damienat Sep 6, 2023

22 votes2317 runs0 comment

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16 votes3418 runs

control flow

Thomas De verdièreat Dec 16, 2021

16 votes3189 runs0 comment

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Anonymous authorat Dec 21, 2021

15 votes2819 runs2 comments

Anonymous authorat Dec 21, 2021

14 votes3689 runs1 comment

Smaïne Millaniat Dec 3, 2021

14 votes1571 runs

13 votes3963 runs

conditionals

Adrienat Mar 30, 2022

13 votes3261 runs0 comment

Thomas De verdièreat Dec 16, 2021

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'

How many instance of Integer cannot be freed from memory?