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.

Salesforce
JUNIOR
Tested skills
Duration
35 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Salesforce, Salesforce Admin, Salesforce development

Programming task - Level: Easy

Salesforce | Consulting | Sales Masters - Add two Roll-Up summary fields and one formula field which displays an image to the Account object.

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

Choice questions

assessing knowledge of Apex, Salesforce

Code gaps

assessing knowledge of SOQL, Salesforce

Programming task - Level: Medium

Apex | Record Updater Identification - Implement the solution that does not affect currently implemented automation.

Salesforce
SENIOR
Tested skills
Duration
80 minutes max.
Evaluation
Automatic
Test overview

Database task - Level: Hard

SOQL | Adventures of Space Doctors - Write a SOQL query that will retrieve a list of movies and related movie roles.

Programming task - Level: Hard

Apex | Trading Company - Load Accounts using a staging object, search for duplicates and perform appropriate actions asynchronously.

JavaScript
SENIOR
Tested skills
Duration
85 minutes max.
Evaluation
Automatic
Test overview

Programming task - Level: Hard

HTML/CSS | Home Page - Complete CSS property definitions so the page displays the appropriate splash loader screen before it displays the home page.

Programming task - Level: Hard

JavaScript | Functional memoization - Write the two versions of generic memoization mechanism.

Angular
MIDDLE
Tested skills
Duration
101 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Angular, JavaScript

Code gaps

assessing knowledge of Angular, JavaScript

Programming task - Level: Medium

JavaScript | Angular | Reactive forms - Prepare a registration form using Reactive forms

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

Database task - Level: Medium

SQL | MSSQL | Finding nulls - Write a query that returns the names of all items which are not available

Database task - Level: Medium

SQL | MSSQL | Finding date ranges - Write a query that returns the names of all items added within the last 7 days.

Database task - Level: Medium

SQL | MSSQL | Using aggregates - Write a query that returns the names of all items of a given category

Database task - Level: Medium

SQL | MSSQL | Finding duplicates - Write a query that returns the names of all items which are duplicated

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

Choice questions

assessing knowledge of CLI, DevOps, SysOps, Terraform, AMI, AWS, EBS, EC2, EIP, Debug, Troubleshooting, Azure

Code gaps

assessing knowledge of Terraform

Programming task - Level: Medium

DevOps | Terraform, Azure | PaaS Resources - Use Terraform azurerm provider to provision docker registry, app service and expose the app via dns

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

Choice questions

assessing knowledge of CLI, DevOps, SysOps, Terraform

Code gaps

assessing knowledge of *Terraform

Programming task - Level: Easy

DevOps | Terraform | GCP Provider - Using Terraform and GCP provider please create a compute instance, create and attach disk, configure ssh and apply firewall rules.

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

Choice questions

assessing knowledge of Python, NoSQL, MongoDB

Code gaps

assessing knowledge of Python, NoSQL, MongoDB

Programming task - Level: Medium

Python | MongoDB | Stock market quotes | Recent Prices - Loading and querying stock market data with MongoDB collections.

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

Choice questions

assessing knowledge of Python, NoSQL, MongoDB

Code gaps

assessing knowledge of Python, NoSQL, MongoDB

Programming task - Level: Hard

Python | MongoDB | Stock market quotes | Collection - Loading and querying stock market data with MongoDB collections.

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

Choice questions

assessing knowledge of Java and Spring Boot

Code gaps

assessing knowledge of Java and MongoDB

Programming task - Level: Medium

Java | MongoDB, Spring Boot | Flight searcher with MongoDB cache - Implement code that will be able to query multiple airlines for prices according to the client’s request.

QA
JUNIOR
Tested skills
Duration
53 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of QA, .NET, C# and Selenium

Code gaps

assessing knowledge of QA, .NET, C# and Selenium

Programming task - Level: Easy

QA | .NET, Selenium | Firefox Driver | Selenium tests for Login Page - Implement selenium tests for the login page: check HTML components, CSS styles, set the value of the input fields, and click on the button on the page.

Android
JUNIOR
Tested skills
Duration
53 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of Android,

Code gaps

assesing knowledge of Android, Kotlin and Java

Programming task - Level: Easy

Android | Kotlin | Employees Application - Complete app that displays a list of people responsible for different areas in the company like IT or Payroll.

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

Choice questions

assessing knowledge of MongoDB, NoSQL

Code gaps

assessing knowledge of Python

Programming task - Level: Easy

Python | MongoDB | Stock market quotes - Load and query stock market data with MongoDB collections.

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

Choice questions

assessing knowledge of Big Data, PySpark, Python

Code gaps

assessing knowledge of SQL

Programming task - Level: Hard

Python | PySpark | Fleet management corporation - Detect speeding events and verify correctness of an existing predictor.

MIDDLE
Tested skills
Duration
44 minutes max.
Evaluation
Manual
Test overview

Choice questions

assessing knowledge of Arrays, Data Step, SAS, Databases, frequency tables, statistics, ODS, reports, Macro language

Code gaps

assessing knowledge of Analytics, SAS, TTest, statistics, Data Step, PROC SQL

Code review task - Level: Medium

SAS | Reading and filtering data - Verify the quality of code that uses data manipulation and macro language statements and add comments on how to improve it. Remember to optimise the code’s performance and follow SAS best practices.

SENIOR
Tested skills
Duration
41 minutes max.
Evaluation
Manual
Test overview

Choice questions

assessing knowledge of GLM procedure, SAS, statistics, Data Step, Hash, Databases, Macro language, conditional formatting, reports

Code review task - Level: Hard

SAS | Macrodefinitions - Verify the quality, efficiency and readability of the code which creates a new macrodefinition named split and add comments on how to improve it. Remember to optimise the code’s performance and follow SAS best practices.

JUNIOR
Tested skills
Duration
42 minutes max.
Evaluation
Manual
Test overview

Choice questions

assessing knowledge of SAS, reports, Data Step, Excel, Macro language, means procedure, statistics, Databases

Code gaps

assessing knowledge of Data Step, PROC SORT, SAS, reports

Code review task - Level: Easy

SAS | Data manipulation - Verify the quality of code that uses data manipulation and add comments on how to improve it. Remember to optimise the code’s performance and follow SAS best practices.

.NET
MIDDLE
Tested skills
Duration
45 minutes max.
Evaluation
Automatic
Test overview

Choice questions

assessing knowledge of QA, Testing

Programming task - Level: Medium

QA | .NET | NUnit tests for Data Processing Interface - Implement NUnit tests for IDataProcessing interface into NUnitDataProcessing.Tests.DataProcessingTest project that verifies business requirements.

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

Choice questions

assessing knowledge of Java, Spring, Hibernate

Programming task - Level: Easy

Java | Spring, Hibernate | Hottest pepper application - Implement methods inside PepperDao class using Spring and Hibernate.

Angular 2+
SENIOR
Tested skills
Duration
53 minutes max.
Evaluation
Automatic
Test overview

Code gaps

assessing knowledge of Angular2+, JavaScript

Choice questions

assessing knowledge of HTML

Programming task - Level: Hard

JavaScript | Angular 2+ | Router Role Based Access Control - Prepare a simple RBAC for routes and components.

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

Choice questions

assessing knowledge of Python, Spark

Programming task - Level: Medium

Python | PySpark | Customer Preference Model - Implement a Data Engineering application for preprocessing marketing data.

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

Choice questions

assessing knowledge of Keras, Machine Learning, Python

Programming task - Level: Medium

Python | NLP, Keras | Sentiment analysis of customer reviews - Perform a sentiment analysis and tagging of movie and airline customer reviews, using a multi-output neural network model.

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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