Coding tests

DevSkiller’s coding test catalog contains real-life work sample coding and programming tests. Our coding tests are powered by the RealLifeTesting™ methodology which helps you to single out qualified developers with the required skill set.

Browse our range of coding tests that cover over 220+ languages, resources, and skills. Finding your next developer has never been easier with DevSkiller coding tests and interview questions.

Swift
SENIOR
Tested skills
Duration
76 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Swift, iOS

Code gaps

assessing knowledge of Swift, iOS, MacOS

Programming task - Level: Hard

iOS | Swift | Nerd Airlines App - Build an app that is used to find the cheapest route between two given destinations. Implement a graph traversing mechanism to find the cheapest route by filling out the appropriate methods, implement a generic caching mechanism for the given two easter eggs of the app.

security
JUNIOR
Tested skills
Duration
46 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Math, Probability, Soft Skills, Cybersecurity, Vulnerabilities, Web Security

Code gaps

assessing knowledge of Cybersecurity, Netcat, Reverseshell, Nmap, Portscan, Curl, Password, Protection

Testing task - Level: Easy

Cybersecurity | XSS Pastebin - In this challenge the contestant is given a task with a pastebin page which is prone to the XSS vulnerability at the administrator's portal. This enables the attacker to impersonate the administrator without knowing correct credentials.

security
MIDDLE
Tested skills
Duration
70 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Logical thinking, Sequence, Soft Skills, Cybersecurity

Code gaps

assessing knowledge of Cybersecurity, Hashing, MD5, Password, Nmap, Portscan, Nnetcat

Testing task - Level: Medium

Cybersecurity | SSTI Challenge - In this challenge the contestant is given a task with a microblog engine. The task is to achieve remote execution on the server. The flawed usage of templates enables that

Web Security
JUNIOR
Tested skills
Duration
78 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Math, Probability, Soft Skills, Cybersecurity, Vulnerabilities, Web Security

Code gaps

assessing knowledge of Cybersecurity, Nmap, Portscan, Ports, Enumeration, Windows

Testing task - Level: Easy

Cybersecurity | LFI Challenge - In this challenge the contestant is given a task with a website vulnerable to local file inclusion attack. The attacker can load arbitrary data from the filesystem.

Web Security
JUNIOR
Tested skills
Duration
104 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Logical thinking, Sequence, Soft Skills, Cybersecurity, Vulnerabilities, Web Security, OAuth2

Code gaps

assessing knowledge of Cybersecurity, Netcat, Reverseshell, Nmap, Portscan

Testing task - Level: Easy

Cybersecurity | XXE | UAV Panel - Lverage XXE vulnerability to load external file contents.

security
JUNIOR
Tested skills
Duration
52 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Logical thinking, Sequence, Soft Skills, Authentication, Authorization, Cybersecurity, OAuth2

Code gaps

assessing knowledge of Cybersecurity, Netcat, Reverseshell, Nmap, Portscan, Enumeration, Windows

Testing task - Level: Easy

Cybersecurity | Inventory Command Injection - Inject a payload and achieve command execution serverside.

Ruby
SENIOR
Tested skills
Duration
127 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Ruby

Code gaps

assessing knowledge of Ruby

Programming task - Level: Hard

Ruby | Flight manager app | Seats reservation and flights analysis - Implement a solution that manages flights, generates seats, and books them.

JavaScript
JUNIOR
Tested skills
Duration
51 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JavaScript

Code gaps

assessing knowledge of JavaScript

Programming task - Level: Easy

JavaScript | Word search - Initialize the WordSearch object to hold the letterGrid and implement the find method that will search a given grid in all directions.

Android
MIDDLE
Tested skills
Duration
41 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Android

Code gaps

assessing knowledge of Android, Kotlin

Programming task - Level: Medium

Android | Kotlin | RecyclerView | To-do List - Create a simple to-do list where each item is a list item in the RecyclerView.

Flutter
MIDDLE
Tested skills
Duration
72 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Asynchronous programming, Dart, Flutter, Futures, Core, InheritedWidget

Code gaps

assessing knowledge of Dart, Extension, Flutter, Theme

Programming task - Level: Medium

Flutter | Simple Employees Catalogue Application - Implement search with filters for list with employees.

Ruby
JUNIOR
Tested skills
Duration
81 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Ruby on Rails

Code gaps

assessing knowledge of Ruby, Ruby on Rails

Programming task - Level: Easy

Ruby | Ruby on Rails | Simple API Student Class App - Implement a background for a virtual class register for a local school. Add validation rules and implement endpoint to expose some JSON data.

React
JUNIOR
Tested skills
Duration
39 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JS, JavaScript, React

Code gaps

assessing knowledge of JavaScript, React

Programming task - Level: Easy

JavaScript | React, Class Components, Enzyme | Search-Engine Application - Implement an application to search and filter products in an online shop.

Node.JS
MIDDLE
Tested skills
Duration
87 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JavaScript, Node.JS

Code gaps

assessing knowledge of JavaScript, Node.JS, SQL

Programming task - Level: Medium

Node.JS | Rest API | News backend service - Implement a news backend service created in Node.JS with Vanilla JS including writing authorization and Rest APIs.

Java
MIDDLE
Tested skills
Duration
104 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Java, Spring Boot

Code gaps

assessing knowledge of Core Java, Exceptions, Java, Generics, I/O system

Programming task - Level: Medium

Java | Couchbase, Spring Boot | Card Payments - Create a card payment processing microservice. Finish the implementation of saving payment data into Couchbase and communicate with other services.

Java
JUNIOR
Tested skills
Duration
49 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Core Java: Network Communication, Generics, Memory Management

Code gaps

assessing knowledge of Core Java: Collections, Memory Management, Generics

Programming task - Level: Easy

Java | Currency Exchange - Complete the implementation of the Currency Exchange app, which is responsible for managing exchange rates and exchanging the currencies.

Java
JUNIOR
Tested skills
Duration
37 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Java, Core Java, Lambda Expressions, Memory Management

Code gaps

assessing knowledge of Core Java, Java, Memory Management, collections, Lambda Expressions

Programming task - Level: Easy

Java | Library Application - Creation of an application allowing the library to manage their books stock. Task goal is to finish the implementation of missing service methods.

TypeScript
JUNIOR
Tested skills
Duration
51 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Typescript

Code gaps

assessing knowledge of JavaScript, React

Choice questions

assessing knowledge of HTML, CSS

Programming task - Level: Easy

TypeScript | React Hooks | Movies State Management - Complete movies management application using React Hooks by implementing state management to existing views.

SQL
JUNIOR
Tested skills
Duration
25 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Logical thinking, Math, MySQL, SQL

Code gaps

assessing knowledge of SQL

Task - Level: Easy

SQL | MySQL | Stamps catalogue | AVG Function - Select the stamps (name and price) with price greater than or equal to the total average price.

SQL
MIDDLE
Tested skills
Duration
53 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of SQL, PostgreSQL

Code gaps

assessing knowledge of PostgreSQL, SQL

Task - Level: Medium

SQL | PostgreSQL | Music Store | Time function - Calculate the duration of all songs in each cd and output a list.

Recommended roles for DevSkiller code tests

We have coding tests available for a range of roles and positions at every level. Without naming all of them, here are just a handful of positions you can test for with our code tests:

  • .NET/C# developer
  • Blockchain engineer
  • C/C+ developer
  • COBOL developer
  • Data Science developer
  • DevOps developer
  • Go developer
  • Groovy developer
  • HTML/CSS developer
  • iOS developer
  • Java developer
  • JavaScript developer
  • Kotlin developer
  • NoSQL developer
  • PHP developer
  • Python developer
  • QA developer
  • React Native developer
  • Ruby on rails developer
  • Scala developer
  • Security engineer
  • SQL developer

How our coding tests work

All DevSkiller coding tests are powered by the RealLifeTesting Methodology™. This form of testing is totally unique to DevSkiller and provides valuable insight into the candidate’s skills. It works by testing with real-world problems and tasks that they are likely to face on the job. This methodology will not only provide a clear understanding of the candidate’s coding skills but also their critical thinking, problem-solving ability, and time management skills.

Key features: DevSkiller code tests

  • Determine the candidate’s coding ability and not just their academic knowledge
  • Remote testing means invites can be sent anywhere in the world, at any time
  • The RealLifeTesting™ methodology offers a greater user experience where candidates can use their own IDE, clone to GIT, run unit tests, and access Stack Overflow/GitHub/Google for research.
  • Strict anti-plagiarism tools that ensure test accuracy
  • Observe tests in real-time
  • Automatically generated results that non-technical professionals can understand
  • Coding tests available for junior, middle, and senior-level positions

Build your own custom tests

Want to start testing your developer candidates using your own codebase? No problem! With DevSkiller and our online task wizard, building your very own custom tests has never been easier. Choose the languages, resources, and skills you want to test, set the test difficulty and duration, plus loads more. Finding the right candidate today with DevSkiller and our coding test catalog.

Still not sure about DevSkiller coding tests?

We understand that it’s important to think carefully before making financial decisions for your company. Rather than listening to us, why not have a read about what one of our many satisfied customers have to say about DevSkiller code tests.

Plutora

Plutora is a leading player in value stream management, with release, test environment, and analytics solutions for enterprise IT. Prior to implementing DevSkiller, Plutora used phone interviews to preselect their candidates. Those who passed were invited to a technical interview which was followed by a behavioral interview. The lack of automation in this process meant that it required a lot of manual work on their side. Also, the effectiveness of phone screening was insufficient and meant many candidates progressed to the interview stages.

The decision was made to introduce DevSkiller coding tests to help automate the technical screening process, limit the number of interviews, and identify the right candidates before the interview stage. With the successful implementation of DevSkiller code tests, Plutora was able to save approximately 8 hours per candidate of their internal development team. That’s because they don’t have to spend time interviewing weak candidates.

“Thanks to automating the screening stage, we were able to reduce the interview rate by 50%. At the same time, the quality of candidates who make it to the interview stage is now much greater. DevSkiller adds an extra layer of quality to our technical hiring process”  – Richard Williams – VP of engineering at Plutora

Frequently asked questions

What is RealLifeTestingTM?

The RealLifeTestingTM methodology serves as the basis of all DevSkiller coding tests. This form of testing is unique because unlike other methods of screening like games or algorithmic puzzles, RealLifeTestingTM provides a 360-degree view of a developer’s skills. The central belief of this methodology is that the most accurate way to evaluate the developmental skills of a candidate is through work sample tests that mirror the actual work they’ll be doing on the job. DevSkiller coding tests task candidates with building full project apps or adding features to existing apps, just like they’ll be doing after being hired. To be successful, candidates must display their knowledge of coding and resources such as Stack Overflow to come up with solutions and problem solving for any issues they encounter. The results will provide insight into the candidate’s academic knowledge, coding skill, decision making, code cleanliness, and problem-solving ability.

How are DevSkiller online tests evaluated?

The DevSkiller platform gets to work as soon as the candidate finishes their test. The results are automatically generated into a report that even a non-techncial recruiter can understand. Candidates are graded on whether the solution would run (an essential factor in all software development), whether or not there are any errors  in the code, code quality, and how it works in edge cases. DevSkiller coding tests are also subject to a series of robus plagiarism features that compare results to previous solutions from other candidates.

How do candidates take a DevSkiller code test?

DevSkiller code tests are fully remote and can be sent anywhere in the world. All the recruiter needs to do is send the candidate a test invite. DevSkiller code tests can be set to be available for a specific amount of time, for example, within 3 days. Candidates can elect to start the test at a time of their choosing, and they have the option of using our state of the art in-browser IDE or completing the project on their favorite IDE and then cloning the project to GIT. As candidates are taking the test, they can elect to run unit tests to make sure their solutions work as they’re supposed to. DevSkiller predefined coding tests have a set time limit. Once the time expires, the code test is automatically evaluated and the report is sent to the recruiter.

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