1651 interview questions for Back-end developer (2025)

102 votes3984 runs

46 votes3647 runs4 comments

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36 votes1922 runs1 comment

34 votes2024 runs1 comment

32 votes2924 runs

Pierreat Sep 19, 2022

28 votes3754 runs

Camilleat Apr 27, 2023

24 votes762 runs1 comment

authentication

Damienat Sep 6, 2023

22 votes2298 runs0 comment

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16 votes3406 runs

control flow

Thomas De verdièreat Dec 16, 2021

16 votes3170 runs0 comment

16 votes2748 runs0 comment

Anonymous authorat Dec 21, 2021

15 votes2803 runs2 comments

Anonymous authorat Dec 21, 2021

14 votes3687 runs1 comment

Smaïne Millaniat Dec 3, 2021

13 votes3945 runs

conditionals

Adrienat Mar 30, 2022

13 votes3248 runs0 comment

Thomas De verdièreat Dec 16, 2021

13 votes3133 runs4 comments

1651 interview questionsfor Back-end developer (2025)

Test your technical skills before an interview of Back-end developer with 1651 corrected questions. Beginner, Intermediate or Expert level.

1651 interview questionsfor Back-end developer (2025)

Test your technical skills before an interview of Back-end developer with 1651 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?

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?

Write the SQL query to delete a column from a table