1629 interview questions for Back-end developer (2024)

Medium

70 votes2940 runs4 comments

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

Web developer

Vincent Cotroat Jan 18, 2024

Easy

33 votes2413 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

31 votes2703 runs3 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

30 votes1403 runs1 comment

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

Back-end developer

recursion

Vincent Cotroat Mar 28, 2023

Easy

24 votes2387 runs

7 comments

Write a Java program that prints 'welovedev'.

Full stack developer

strings

variables

Pierreat Sep 19, 2022

Easy

24 votes1513 runs1 comment

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

Back-end developer

functions

errors

Vincent Cotroat Mar 24, 2023

Easy

21 votes2850 runs1 comment

Fix the following Javascript loop:

Web developer

loops

conditions

Camilleat Apr 27, 2023

Medium

16 votes2449 runs0 comment

Explain the prototype scope in Spring

Back-end developer

spring

bean

Anonymous authorat Dec 21, 2021

Hard

16 votes1770 runs0 comment

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

Back-end developer

list

for loop

Théoat Mar 28, 2022

Easy

15 votes2380 runs0 comment

Select only distinct values in a column using SQL

Back-end developer

sql

distinct

Vincent Cotroat Mar 27, 2023

Easy

15 votes2323 runs1 comment

Update a column in an SQL table

Back-end developer

sql

update

Vincent Cotroat Nov 7, 2023

Easy

15 votes435 runs1 comment

What is the purpose of the Laravel Sanctum tool?

Web developer

laravel

authentication

Damienat Sep 6, 2023

Easy

13 votes3524 runs1 comment

What is the minimum PHP version for Symfony 5?

Back-end developer

php

symfony

Smaïne Millaniat Dec 3, 2021

Hard

13 votes2978 runs0 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

13 votes2522 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

12 votes2391 runs0 comment

Write a SQL query to insert data into a table

Back-end developer

sql

insert

Vincent Cotroat Mar 27, 2023

Easy

12 votes2367 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

Hard

11 votes2952 runs0 comment

A monitor in Java

Back-end developer

java

thread

Thomas De verdièreat Jan 4, 2022

Easy

10 votes3359 runs

3 comments

The certificate variable is not attainable outside the if loop

Web developer

variables

scope

Kahinaat Apr 6, 2022

Hard

10 votes2986 runs1 comment

Serialization can be customized with the Externalizable interface

Back-end developer

serialization

interface

Thomas De verdièreat Jan 4, 2022

1629 interview questionsfor Back-end developer (2024)

Test your technical skills before an interview of Back-end developer with 1629 corrected questions. Beginner, Intermediate or Expert level.

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

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

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

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

Write a Java program that prints 'welovedev'.

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

Fix the following Javascript loop:

Explain the prototype scope in Spring

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

What is the purpose of the Laravel Sanctum tool?

What is the minimum PHP version for Symfony 5?

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; } ```

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

Write a SQL query to insert data into a table

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

A monitor in Java

The certificate variable is not attainable outside the if loop

Serialization can be customized with the Externalizable interface