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540 interview questionsfor Software engineer (2026)

Test your technical skills before an interview of Software engineer with 540 corrected questions. Beginner, Intermediate or Expert level.

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540 questions
Medium
119 votes4679 runs
6 comments

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

Web developer
Anonymous authorat Jan 18, 2024
Medium
50 votes4290 runs4 comments

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

Web developer
promises
async
Anonymous authorat Mar 28, 2023
Easy
44 votes2306 runs1 comment

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

Back-end developer
recursion
Anonymous authorat Mar 28, 2023
Easy
40 votes3377 runs
13 comments

Write a Java program that prints 'welovedev'.

Full stack developer
strings
variables
Pierreat Sep 19, 2022
Easy
36 votes6435 runs
1 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
32 votes6395 runs1 comment

Write the missing code to render the children of the UserProfile component.

Web developer
props
list
Victor Sabatierat Jan 4, 2022
Easy
32 votes4377 runs
2 comments

Fix the following Javascript loop:

Web developer
loops
conditions
Anonymous authorat Apr 27, 2023
Hard
27 votes2674 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
21 votes1260 runs1 comment

Load blog post data at build time for a static render.

Web developer
nextjs
static site generation
Anas ISMAILIat Nov 30, 2023
Easy
18 votes5149 runs
2 comments

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Hard
17 votes3680 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
Easy
17 votes3268 runs
2 comments

How should a package be named in Java?

Full stack developer
packages
java
Pierreat Sep 19, 2022
Easy
16 votes4772 runs
5 comments

The certificate variable is not attainable outside the if loop

Web developer
variables
scope
Anonymous authorat Apr 6, 2022
Easy
15 votes6496 runs
2 comments

Save the state used to display the selected page in a React component.

Web developer
state
react
Clément Devosat Nov 7, 2023
Medium
15 votes2023 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
Easy
15 votes1355 runs0 comment

What is the path to the about page in Next.js?

Web developer
nextjs
routes
Anas ISMAILIat Nov 30, 2023
Medium
14 votes3690 runs1 comment

Serialization can be customized with the Externalizable interface

Back-end developer
serialization
interface
Thomas De verdièreat Jan 4, 2022
Hard
14 votes3617 runs0 comment

A monitor in Java

Back-end developer
java
thread
Thomas De verdièreat Jan 4, 2022
Easy
14 votes3573 runs0 comment

What does the final keyword mean in front of a method in Java?

Back-end developer
java
methods
Thomas De verdièreat Jan 4, 2022
Hard
14 votes3515 runs0 comment

How many instance of Integer cannot be freed from memory?

Back-end developer
array
memory
Thomas De verdièreat Dec 16, 2021
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