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.

Junior Blockchain Developer | Ethereum, Ether, Solidity Simple Lottery

Tested skills

Junior Blockchain Developer | Ethereum, Ether, Solidity Simple Lottery

Choice questions

Code gaps

Programming task - Level: Easy

Senior React Developer | Integration Testing, JavaScript React, React Hooks, Redux, Redux-Toolkit | Simple website builder

Tested skills

Senior React Developer | Integration Testing, JavaScript React, React Hooks, Redux, Redux-Toolkit | Simple website builder

Choice questions

Code gaps

Programming task - Level: Hard

JavaScript | React, React Hooks, Redux, Redux-Toolkit | Simple website builder - Implement an initial version of a WYSIWYG editor that enables users to build a simple website just by picking HTML tags from the widget and filling all the attributes they need.

Senior Salesforce Developer | Apex Library application

Tested skills

Senior Salesforce Developer | Apex Library application

Choice questions

Code gaps

Programming task - Level: Hard

Salesforce | Apex | Library application - Create an application allowing library to manage books, their borrowings and prepare some reports about books which were not returned on time. Your current task is to finish implementation of missing service methods.

Middle Flutter Developer Weather app

Tested skills

Middle Flutter Developer Weather app

Choice questions

Code gaps

Programming task - Level: Medium

Flutter | Dart | Weather app - Implement new functionalities to the given simple app that displays live weather forecasts for cities in Poland.

Middle Ruby Developer Drug Analyzer

Tested skills

Middle Ruby Developer Drug Analyzer

Choice questions

Code gaps

Programming task - Level: Medium

Ruby | Drug Analyzer - As a member of a biotechnology programming team you are responsible for creating a system for lab technicians, which will assist them with drug analysis. The goal is to create the application that will let them input their findings into the system, provide a meaningful analysis and verify the correctness of the data that they have sent.

Middle Salesforce Developer | Apex Library application

Tested skills

Middle Salesforce Developer | Apex Library application

Choice questions

Code gaps

Programming task - Level: Medium

Salesforce | Apex | Library application - Create an application allowing a library to manage books and their borrowings. Your current task is to finish the implementation of the missing service methods.

Junior Salesforce Developer | Apex Library application

Tested skills

Junior Salesforce Developer | Apex Library application

Choice questions

Code gaps

Programming task - Level: Easy

Salesforce | Apex | Library application - Create an application allowing the library to manage their books stock. Finish the implementation of the missing service methods.

Junior Angular Developer | JavaScript Car List

Tested skills

Junior Angular Developer | JavaScript Car List

Choice questions

Code gaps

Programming task - Level: Easy

Senior Blockchain Developer | Hardhat Price Calculator

Tested skills

Senior Blockchain Developer | Hardhat Price Calculator

Choice questions

Code gaps

Programming task - Level: Hard

Blockchain | Solidity | Price Calculator - Implement price calculator for incoming manufactory product data with time reset functionality.

Middle Ruby on Rails Developer | SQLite Search-Engine Application with Rails

Tested skills

Middle Ruby on Rails Developer | SQLite Search-Engine Application with Rails

Choice questions

Code gaps

Programming task - Level: Medium

Ruby | Ruby on Rails | Search-Engine Application with Rails - Add ordering, tags, price and name filtering endpoint for online shop application.

Junior Salesforce Developer | Apex Operation method

Tested skills

Junior Salesforce Developer | Apex Operation method

Choice questions

Code gaps

Programming task - Level: Easy

Salesforce | Apex | Operation method - Implement a method to sum up the numbers from a given list of strings. Please remember that at the beginning of this task 20% of verification test are already resolved.

Middle Blockchain Developer | Solidity, Ethereum, NFT OpenZeppelin Contracts

Tested skills

Middle Blockchain Developer | Solidity, Ethereum, NFT OpenZeppelin Contracts

Choice questions

Code gaps

Programming task - Level: Medium

Middle Salesforce Developer | Apex Orders Analyzer | Find an average order value for every weekday

Tested skills

Middle Salesforce Developer | Apex Orders Analyzer | Find an average order value for every weekday

Choice questions

Code gaps

Programming task - Level: Medium

Salesforce | Apex | Orders Analyzer | Find an average order value for every weekday - Implement OrdersAnalyzer#averageDailySales method that returns a map of days of a week and rounds the average value to the nearest integer.

Junior Salesforce Developer | Apex Find duplicates

Tested skills

Junior Salesforce Developer | Apex Find duplicates

Choice questions

Code gaps

Programming task - Level: Easy

Salesforce | Apex | Find duplicates - Implement findDuplicates method that returns a new list containing duplicates which occured N-times.

Senior Salesforce Developer | Apex Implement REST API for handling Product Reviews

Tested skills

Senior Salesforce Developer | Apex Implement REST API for handling Product Reviews

Choice questions

Code gaps

Programming task - Level: Hard

Salesforce | Apex | Implement REST API for handling Product Reviews - Implement Http GET and POST REST API requests that let get existing reviews and insert new ones.

Middle R Developer Matrix and Vector Operations

Tested skills

Middle R Developer Matrix and Vector Operations

Choice questions

Code gaps

Programming task - Level: Medium

R | Base R | Matrix and Vector Operations - Implement a function that calculates a few mathematical and statistical procedures.

Middle Angular Developer | JavaScript Static Pages Editor

Tested skills

Middle Angular Developer | JavaScript Static Pages Editor

Choice questions

Code gaps

Programming task - Level: Medium

Middle Salesforce Developer | Apex Flights manager

Tested skills

Middle Salesforce Developer | Apex Flights manager

Choice questions

Code gaps

Programming task - Level: Medium

Salesforce | Apex | Flights manager - Finish the implementation of an MVP of an application responsible for managing flights data.

Senior Blockchain Developer | Solidity, Hardhat Staking

Tested skills

Senior Blockchain Developer | Solidity, Hardhat Staking

Choice questions

Programming task - Level: Hard

Senior Python Developer | Data Science, NumPy Graph Convolutional Networks

Tested skills

Senior Python Developer | Data Science, NumPy Graph Convolutional Networks

Choice questions

Programming task - Level: Hard

Middle Python Developer | OOP, REST API Customer Relationship Management App

Tested skills

Middle Python Developer | OOP, REST API Customer Relationship Management App

Choice questions

Code gaps

Programming task - Level: Medium

Python | Class Programming, Customer Relationship Management App - Implement a REST API client with OOP techniques using Python 3 .

Middle Python Developer | Django Books CRUD Application

Tested skills

Middle Python Developer | Django Books CRUD Application

Choice questions

Code gaps

Programming task - Level: Medium

Python | Django | Books CRUD Application - This application uses Python 3 and Django 1.11. It contains a Books module for managing book entities.

Middle Python Developer | Pandas Spreadsheet to HTML table

Tested skills

Middle Python Developer | Pandas Spreadsheet to HTML table

Choice questions

Code gaps

Programming task - Level: Medium

Python | Pandas | Spreadsheet to HTML table - Process the input file and generate HTML with "general classification" table as a result.

Junior Python Developer | Flask Split Expenses App

Tested skills

Junior Python Developer | Flask Split Expenses App

Choice questions

Code gaps

Programming task - Level: Easy

Recommended roles for DevSkiller 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 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.