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.

Solidity
SENIOR
Tested skills
Duration
105 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Anonymity, Blockchain, Decentralization, DLT, Leger

Programming task - Level: Hard

Blockchain | Solidity | Staking - A smart contract with a staking functionality.

Python
SENIOR
Tested skills
Duration
110 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Python 3.x, Logical thinking, Sequence, Soft Skills

Programming task - Level: Hard

Python | NumPy | Graph Convolutional Networks - Implement a simple Graph Convolution Network.

Python
MIDDLE
Tested skills
Duration
57 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Python 3.x

Code gaps

assessing knowledge of Python 3.x

Programming task - Level: Medium

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

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

Choice questions

assessing knowledge of Python

Code gaps

assessing knowledge of Python

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.

Python
MIDDLE
Tested skills
Duration
71 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Python

Code gaps

assessing knowledge of Python

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
Tested skills
Duration
96 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Python

Code gaps

assessing knowledge of Python

Programming task - Level: Easy

Python | FastApi | Movie Collection Management App - Make tests pass by implementing the missing features in using Python 3 and FastApi

JUNIOR
Tested skills
Duration
55 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Bitcoin, Blockchain, Cryptocurrency, Ethereum, Smart Contracts

Programming task - Level: Easy

Blockchain | Solidity, Ethereum, Hardhat | Car Dealership Registry - Car Dealership Repair Shop Registry which tracks work done on cars

MIDDLE
Tested skills
Duration
97 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Python 3.x

Code gaps

assessing knowledge of Python 3.x

Programming task - Level: Medium

Python | FastAPI | Prediction model - Expand the current FastAPI application to let Data Scientists post their models via API, store them in a Database, view them and get some predictions out of them, based on an input value.

Ruby on Rails
JUNIOR
Tested skills
Duration
37 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Ruby, Ruby on Rails

Code gaps

assessing knowledge of Ruby, Ruby on Rails

Programming task - Level: Easy

Ruby | Ruby on Rails | Search-Engine Application with Rails - Add simple price and name filtering endpoint for online shop application

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

Choice questions

assessing knowledge of Anonymity, Blockchain, Decentralization, DLT, Leger, Ether, Accounts, Ethereum

Programming task - Level: Medium

Blockchain | Solidity | Lottery - Implement the one time raffle based on blockchain technology.

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

Choice questions

assessing knowledge of Blockchain, Ether, Smart Contracts, Anonymity, Decentralization, DLT, Leger, Accounts, Ethereum

Programming task - Level: Easy

Blockchain | Solidity | Auctions - Implement a basic auction using a smart contract which grants its creator the ability to initiate and manage a public auction.

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

Choice questions

assessing knowledge of Typescript

Code gaps

assessing knowledge of Typescript

Programming task - Level: Medium

TypeScript | Redux, Selectors | HR Department Salary - Implement Redux Selectors which will process HR data. Implementation will be tested against snapshot tests.

Java
SENIOR
Tested skills
Duration
111 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Java, Core Java, I/O system, Lambda Expressions, Exceptions

Code gaps

assessing knowledge of Java, Core Java, I/O system, Lambda Expressions, Network Communication

Programming task - Level: Hard

Java | Library application - Create an application that allows the library to manage books, their borrowings and prepare some reports about books that were not returned on time. Finish implementation of the missing service methods.

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

Choice questions

assessing knowledge of Swift, iOS

Code gaps

assessing knowledge of Swift, iOS

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.

terraform
SENIOR
Tested skills
Duration
77 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of CLI, DevOps, SysOps, Terraform, Azure

Code gaps

assessing knowledge of DevOps, Terraform

Programming task - Level: Hard

DevOps | Terraform, Azure | Application Gateway - You've been asked to securely expose an existing resource to the Internet - after some deliberation the team decided to use Azure Application Gateway.

Application Gateway is a web traffic load balancer with some built in Application Firewall capabilities.

nunit
MIDDLE
Tested skills
Duration
85 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of .NET, .NET Core, ML.NET, QA, Testing, xUnit, NUnit

Code gaps

assessing knowledge of NUnit, QA

Programming task - Level: Medium

QA | .NET | NUnit | Tests for Document Management System API - Implement an NUnit test that checks business requirements for a Documents API for a Document Management System

junit
MIDDLE
Tested skills
Duration
64 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of JUnit, QA

Code gaps

assessing knowledge of JUnit, JUnit4, QA, JUnit 5, Java

Programming task - Level: Medium

QA | JUnit | ATM Service | Authentication and deposit validation - Write test cases to verify the Automated Teller Machine (ATM) software.

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

Choice questions

assessing knowledge of Math, Probability, Soft Skills, Logical thinking, Sequence, Mathematics, Cybersecurity

Code gaps

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

Testing task - Level: Medium

Cybersecurity | Command Injection | Router - In this challenge the contestant is given a task with a router's coniguration page. This instance is vulnerable to command injection. By finding the right syntax to invoke system commands the contestant has to leak additional information from the filesystem.

MySQL
MIDDLE
Tested skills
Duration
60 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Math, Probability, Soft Skills, SQL

Code gaps

assessing knowledge of MySQL, SQL

Task - Level: Medium

SQL | MySQL | Software House | Devs and their projects - The Head of the development team assigned you a task to create a list of developers with their role in the ongoing projects.

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

Choice questions

assessing knowledge of Core Java, Java, Serialization, Date and Time, Generics

Code gaps

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

Programming task - Level: Medium

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

java
MIDDLE
Tested skills
Duration
58 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Core Java, Java, Stream API, I/O system, Date and Time

Code gaps

assessing knowledge of Core Java, Java, Network Communication

Programming task - Level: Medium

Java | Azure | Production summarizer - Create an Azure function. Your current task is to finish implementation of production summarizer returning information about how many cars were produced by a particular plant.

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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