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1652 interview questionsfor Back-end developer (2026)

Test your technical skills before an interview of Back-end developer with 1652 corrected questions. Beginner, Intermediate or Expert level.

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1652 questions
Medium
114 votes4443 runs
6 comments

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

Web developer
Vincent Cotroat Jan 18, 2024
Easy
51 votes3529 runs0 comment

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

Back-end developer
sql
select
where
Vincent Cotroat Mar 30, 2023
Medium
49 votes4077 runs4 comments

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

Web developer
promises
async
Vincent Cotroat Mar 28, 2023
Easy
41 votes2141 runs1 comment

Write a Python function that returns the factorial of a number.

Back-end developer
recursion
Vincent Cotroat Mar 28, 2023
Easy
39 votes2202 runs1 comment

Explain the difference between the `include` and `require` functions in PHP.

Back-end developer
functions
errors
Vincent Cotroat Mar 24, 2023
Easy
35 votes3155 runs
12 comments

Write a Java program that prints 'welovedev'.

Full stack developer
strings
variables
Pierreat Sep 19, 2022
Easy
32 votes4170 runs
2 comments

Fix the following Javascript loop:

Web developer
loops
conditions
Anonymous authorat Apr 27, 2023
Hard
25 votes2517 runs
1 comment

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

Back-end developer
list
for loop
Anonymous authorat Mar 28, 2022
Easy
24 votes888 runs1 comment

What is the purpose of the Laravel Sanctum tool?

Web developer
laravel
authentication
Damienat Sep 6, 2023
Easy
20 votes3476 runs0 comment

Select only distinct values in a column using SQL

Back-end developer
sql
distinct
Vincent Cotroat Mar 27, 2023
Easy
19 votes3387 runs1 comment

Update a column in an SQL table

Back-end developer
sql
update
Vincent Cotroat Nov 7, 2023
Easy
18 votes3495 runs0 comment

Write a SQL query to insert data into a table

Back-end developer
sql
insert
Vincent Cotroat Mar 27, 2023
Hard
17 votes3559 runs
1 comment

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; } ```

Back-end developer
loops
control flow
Thomas De verdièreat Dec 16, 2021
Medium
17 votes2884 runs0 comment

Explain the prototype scope in Spring

Back-end developer
spring
bean
Anonymous authorat Dec 21, 2021
Easy
16 votes3454 runs0 comment

Which SQL keyword is used to sort the result of a SELECT statement?

Back-end developer
sql
order by
Vincent Cotroat Mar 27, 2023
Medium
16 votes2931 runs2 comments

A bean with a `session` scope is injected into a bean with a` singleton` scope. What happens when the application starts?

Back-end developer
spring
scope
Anonymous authorat Dec 21, 2021
Easy
15 votes3729 runs1 comment

What is the minimum PHP version for Symfony 5?

Back-end developer
php
symfony
Smaïne Millaniat Dec 3, 2021
Medium
15 votes1787 runs
1 comment

What is the difference between an interface and an abstract class in Java?

Full stack developer
EL Mostafa Fadiliat Feb 13, 2024
Medium
15 votes914 runs0 comment

What is the best practice to apply in your code to improve the performance of your application?

Back-end developer
performance
gzip
Vincent Cotroat Nov 15, 2023
Hard
14 votes3566 runs1 comment

Serialization can be customized with the Externalizable interface

Back-end developer
serialization
interface
Thomas De verdièreat Jan 4, 2022
Back-end developer tests