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What is CodeSignal?

CodeSignal is a technical skills assessment platform that enables companies to quickly hire qualified candidates for technical roles. With over 70 coding languages and tools and a built in plagiarism checker, companies can be confident that the candidates they select...
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CodeSignal Review: Works To Efficiently Pre-Screen Candidates With Assessment Tools
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What is CodeSignal?

CodeSignal is a technical skills assessment platform that enables companies to quickly hire qualified candidates for technical roles. With over 70 coding languages and tools and a built in plagiarism checker, companies can be confident that the candidates they select will be successful in their new…

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What is HackerRank?

HackerRank is a technology hiring platform from the company of the same name headquartered in Mountain View, for assessing developer skills for over 2500 companies around the world. HackerRank helps companies hire skilled developers and innovate faster by enabling tech recruiters and hiring…

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Product Details

What is CodeSignal?

CodeSignal is a technical interview solution. According to the vendor, companies of all sizes already use CodeSignal’s Pre-Screen, Tech-Screen, and Interview products to tap into underrepresented pools of candidates, increase speed-to-hire, and increase candidate pipeline yield. Studies have shown that companies who use pre-hire screenings see turnover rates reduce by 39%.

CodeSignal uses technology to predict a candidate’s interview performance. CodeSignal’s predictive assessments go beyond testing only for data structures and algorithms, instead they dive deep into subject-specific assessments. The vendor says that every assessment on CodeSignal’s platform supports 38+ programming languages, provides an advanced real-world coding environment, coding scores, and utilize a proprietary AI-powered plagiarism check.

Overview of CodeSignal Features

CodeSignal offers tests in 38+ programming languages in a real life coding environment. Per the vendor, their platform is a “flight simulator for developers” that allows candidates to utilize familiar tools to edit, run and debug their code.

Companies can be confident in the results delivered by CodeSignal because CodeSignal offers keystroke playback and an automated plagiarism checker. The ability to play back the candidate’s keystrokes means that their work can be evaluated by multiple members of the hiring team without the hassle of everyone attending the assessment live. Their AI plagiarism checker searches for suspicious results, such as similarities in candidate responses.

CodeSignal’s assessments can assist companies looking to diversify their teams. Companies can replace a resume screen, and the unconscious bias it may bring, with a coding assessment. Using assessment scores allow them companies to evaluate candidates purely on skill rather than any other factor.

Coding Tests

CodeSignal divides different coding tests up into unit test frameworks that assess a person’s technical skills. Examples of unit test frameworks include:

  • NUnit for .NET Framework

  • xUnit or NUnit for .NET Core

  • JUnit for Java

  • Mocha/Chai for JavaScript

  • PHPUnit for PHP

  • unittest for Python

  • RSpec for Ruby

  • UI tests using Galen

  • UI functionality tests using Puppeteer

Assessments can be set to run in a specific language, or can be language agnostic so that the candidate can complete the test in their preferred language.

Testing job-specific skills allow for companies to pre-screen based on candidate skills and helps to improve the interview to hire ratio, since only qualified candidates will be offered interviews.

Coding Interviews

Companies can use CodeSignal for more than just their screening assessments, as the platform also allows for coding interviews and whiteboard sessions. CodeSignal’s coding interview options are suitable for in-person or virtual interviews. Companies can choose interview tasks from a pre-existing library, or can easily import custom tasks from GitHub.

Using CodeSignal’s interview tool, companies can see how candidates interact with the tools they will use every day on the job and make more informed hiring decisions. Team members can interact with the candidate to evaluate their approach to solving problems.

CodeSignal Features

  • Supported: Plagiarism check
  • Supported: Sharable results
  • Supported: Dedicated customer success manager
  • Supported: Custom APIs and webhooks
  • Supported: SSO via SAML
  • Supported: Premium task library
  • Supported: Chrome extension
  • Supported: Framework based analysis
  • Supported: Predictive coding score
  • Supported: Online proctoring

CodeSignal Screenshots

Screenshot of Evaluate your candidates using languages, frameworks, and tools unique to your job including JavaScript, Python, PHP, React, Ruby, Swift, and many moreScreenshot of Conduct live remote and on-site interviews using CodeSignal's pair programming solution with high definition video and CodeSignal's advanced IDE environment.Screenshot of Administrate and analyze a large volume of assessments.

CodeSignal Videos

Overview of CodeSignal’s “flight simulator for developers”.
CodeSignal Pre-Screen is a top-of-the-funnel assessment that is purpose-built to identify quality candidates in high-volume recruiting scenarios, such as university recruiting. Recruiters can instantly send pre-screen assessments to their entire candidate pipeline and start ...
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CodeSignal Technical Details

Deployment TypesSoftware as a Service (SaaS), Cloud, or Web-Based
Operating SystemsUnspecified
Mobile ApplicationNo

Frequently Asked Questions

CodeSignal is a technical skills assessment platform that enables companies to quickly hire qualified candidates for technical roles. With over 70 coding languages and tools and a built in plagiarism checker, companies can be confident that the candidates they select will be successful in their new roles.

HackerRank, CoderPad, and Codility are common alternatives for CodeSignal.

Reviewers rate Usability highest, with a score of 9.1.

The most common users of CodeSignal are from Enterprises (1,001+ employees).
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Score 8 out of 10
Vetted Review
Verified User
I recently had the opportunity to use CodeSignal for technical interviews, and I must say, it was a great experience. The platform is designed to assess a candidate's coding skills and abilities in a variety of programming languages and concepts. I found the interface to be intuitive and user-friendly, which helped me feel more comfortable during the interview process. Additionally, the platform provided real-time feedback and insights into my performance, allowing me to understand where I excelled and where I could improve. Overall, I highly recommend CodeSignal for anyone looking to participate in technical interviews, as it provides a great platform for everyone.
  • Adaptive Assessments.
  • Code Analysis.
  • Data Structures and Algorithms Testing.
  • Insights and Analytic.
  • Question Bank.
  • User Interface.
  • You can only take it once within 14 days; there should be more flexibility.
As someone who has taken technical interviews using CodeSignal, I have found it to be well-suited for scenarios where the company is looking to evaluate my coding skills in a structured and objective way. I appreciate that the platform provides a variety of coding challenges and assessments that are adaptive and adjust to my skill level. This allows me to showcase my coding abilities and provides a fair evaluation of my technical skills. However, I have found that CodeSignal may be less appropriate for candidates who prefer more. Interactive interview experience. Since the platform is primarily focused on coding challenges and assessments, it may not provide as much opportunity for candidates to interact with the interviewer or showcase their communication and collaboration skills. In such cases, candidates may prefer to have a live or video interview in addition to the CodeSignal assessment.
Score 9 out of 10
Vetted Review
Verified User
CodeSignal was used to find suitable talent for software engineering positions.
  • Good UI
  • Relatively relevant questions to the job
  • Automated results
  • More IDE colors
I think it's well suited for finding talent quickly since the questions asked are more akin to what one would be doing on the job and the automated evaluation. I really can't think of scenarios where this isn't appropriate at the moment.
Daniel Dingess | TrustRadius Reviewer
Score 9 out of 10
Vetted Review
Verified User
I interviewed with many companies with CodeSignal. It was the best software I have used for conducting and participating in coding reviews. It’s intuitive and has a lot of great features, as well as maintains a clean interface. It gives a very good environment for coders of all skill levels.
  • Code syntax
  • Speed, no input lag
  • Reliable compiling
  • Multi tenant coding
  • More libraries
  • Updated frameworks
  • App context more visible
If conducting interviews, CodeSignal is best in class and offers a full suite of modern, functional features to support developers and engineers of all experience levels. It allows quick editing and returns time to the interview by being dependable and efficient. I would use CodeSignal as the basis for all technical coding interviews as it allows reusability and standardizing across a big organization.
Score 9 out of 10
Vetted Review
Verified User
CodeSignal is the ideal tool to implement diagnostic tests for prospective hires and current employees seeking promotions. We did not have the bandwidth to set up an internal system for the aforementioned testing; CodeSignal covers this use case for our business. Our scope of usage can be summarized as “knowledge and proficiency testing framework”.
  • Easily Understood UI/UX
  • Wide variety of testing options
  • High availability
  • Better post-examination analytics
For most development roles, it is quite easy to set up a CodeSignal and it is often effective in filtering candidates in early stages. As a candidate; CodeSignal provides a well oiled user experience and acts as a method to set oneself apart from other candidates. In later stages CodeSignal has less efficacy in differentiating; it might be better to customize to your needs at this point.
March 11, 2023

Valuable Product.

Score 9 out of 10
Vetted Review
Verified User
I use CodeSignal for technical interviews and coding interview practice. The product is beneficial for software engineers who want to brush up on their skills. Companies often send CodeSignal technical interviews to screen their candidates, and CodeSignal also offers services to allow users to complete practice questions on their websites.
  • Identifying industry needs.
  • Simplifying the interview process.
  • Providing a resource for job seekers.
  • the flexibility of learning plans.
  • The user profile should be optional.
CodeSignal is very well suited for the interview process. It streamlined the candidate experience and allows companies to manage their job applicants. I think it is less appropriate for use as a practice tool because there are alternatives that do it better. I think that CodeSignal is useful for students and employers.
Score 10 out of 10
Vetted Review
Verified User
I use it to prepare for coding interviews since it offers a real-like interview against the clock.
  • Great user interface
  • Provide real-like problems
  • Simulates a real interview
  • Have a debugger available
  • Have a discussion forum
If you are preparing for coding interviews and are looking to elevate your preparation with a real-interview like scenario, CodeSignal is a great platform that offers just that. You are able to simulate as if you were on a real coding interview with 2-4 coding questions. These questions are very similar if not identic to what you would get ask in a real scenario and many big tech companies use this platform to conduct their own assessments.
Score 5 out of 10
Vetted Review
Verified User
I used it for a coding assessment for Roblox to test my coding skills. This helped Roblox to assess how much coding I knew and know whether or not I would be a good fit for the role based on their expectations for what a good candidate for the role could do.
  • Testing Applicants
  • User Interface
  • Questions for technical interviews
  • Checking for cheaters
  • User experience
  • Autocomplete features
It is well suited to coding assessments for software jobs especially those for students since they can be hard to assess since students can have similar profiles as they go to the same school for the same program so this helps to differentiate them from one another and assess them.
Score 10 out of 10
Vetted Review
Verified User
I used CodeSignal as practice for interviews as well as performing the actual interview. When using CodeSignal, the evaluation is purely performance-based and automated, which reduces the likelihood of biases that may influence traditional interviews. By using their platform for both practice and actual interviews, I was able to become more comfortable with the types of problems I would encounter.
  • User Interface.
  • Practice Problems.
  • Scoring Guide.
  • More practice problems.
  • Guides to approach for study.
It is good for when you are already familiar with Leetcode as Codesignals practice tests are purely random and do not have problems that are already solved like in Leetcode. It is more in line with what actual interviews are.
Score 7 out of 10
Vetted Review
Verified User
I didn't use it in my organization; I used it as a person attempting to get into Zoom for a software engineering position. However, it did act as a good way for zoom to assess my capabilities, and for me to practice coding problems and gain practical experience for other engineering positions, too.
  • Good UI
  • Easy to understand
  • Breadth of content
  • User-friendly testing interface
  • More clarity on coding report would be great
Its really good if you want to practice working on your engineering skills. Also, if I happened to need to look for employees for a position, CodeSignal would provide a very easy way to filter out good/bad applicants. Its also very good to get a gague of how you are at coding relative to many others around the world.
Score 8 out of 10
Vetted Review
Verified User
I used it to give online assessments from different companies as a part of my internship-hunting journey. I have more than eight months of experience with this platform. I loved the features where we get a score about how well we did on the test, and we can even use that score with other companies.
  • Proctoring
  • Responsive UI.
  • Scoring tests.
  • Code auto-complete.
  • More languages.
  • Better UI.
I am only a user. It was necessary for me to utilize it when taking coding examinations for several employers. Code Signal assists businesses in automating or screening candidates based on code signal performance, which is the business issue it solves. With the use of this indication, they will be able to conduct interviews more quickly.
Score 9 out of 10
Vetted Review
Verified User
As a student in engineering, we had to conduct various labs. In the case of code signals, our operating system lab involved installing the program Keil vision which lets you program the board. I, like many other engineers, purchased an Apple Silicon computer recently. Because of that, native support for Keil did not exist, meaning I would have to remote into a Windows computer or do various other expensive options. Code Signals was a good mix where it was very affordable and a one-time purchase (without updates) and allowed me to complete the lab. I would highly recommend it.
  • Cheap.
  • One Time Purchase.
  • Maybe UI.
  • Have a clearer list of what apps work.
If CodeSignals has the app that you need on an Apple Silicon mac it's awesome. Obviously, if it doesn't you'll need to look elsewhere.
March 05, 2023

Coding Made Easy...

Score 10 out of 10
Vetted Review
Verified User
The platform is amazing for new coders and people who want to learn to code. The use case lies pretty much in all IT organizations who want to attract good coding talent.. an amazing platform for preparing for coding interviews and for organizations who want to conduct coding interviews. I was amazed by the platform's UI when I first used it for one of my coding interviews.
  • The UI of the platform is amazing and very user-friendly.
  • The clarity on how an interview test is assessed is great and very easy to understand.
  • Automated coding tests that companies can use.
  • Amazing practice tests on the platform.
  • The range of scores given to a individual can be better explained.
  • The practice tests given on the platform are too easy and can be improved to match the level of the actual test.
I think code signal is one of the best platforms for organizations to better test the resource for their coding skills. Its way of conducting the test saves engineering time, reduces the risks that hiring companies have in technical interviews, and provides a cheating-free environment. The platform can be improved to make the new learners practice well on the platform and get used to it.
Score 9 out of 10
Vetted Review
Verified User
CodeSignal is an online platform that offers a suite of tools for technical recruiting and skills assessment. It provides a comprehensive solution for evaluating technical skills, identifying top talent, and optimizing the hiring process.
  • Skills Assessment.
  • Interviewing: CodeSignal also offers tools for conducting technical interviews.
  • Learning & Development: CodeSignal offers a range of resources for learning and development, including coding challenges, tutorials, and courses.
  • Talent Acquisition: Finding and recruiting top technical talent is a major challenge for many organizations. CodeSignal can help organizations identify the most qualified candidates quickly and efficiently, reducing time-to-hire and improving the quality of hires.
When a job has thousands of applications, one can use CodeSignal to filter out the best suitable candidates.
Score 9 out of 10
Vetted Review
Verified User
I currently use CodeSignal to prepare for my coding interviews since many big companies use this platform to conduct their own technical assessments. It is a great way to prepare since you have a real feeling of the experience, you get asked similar type of questions, get to interact with the interface and in addition to that, you have to complete within certain amount of time.
  • User experience
  • Provide real interview questions
  • Feedback on your results
  • Make discussion section
  • Have their questions divided into more sections
CodeSignal is very suitable if you want to experience what a real world interview is like under time pressure
November 23, 2022

Users take on Codesignal

Score 5 out of 10
Vetted Review
Verified User
I'm just a user. I had to use it for taking coding assessments for various different companies. The business problem that code signal addresses is that it helps out companies with automating or filtering candidates based on code signal performance. This indicator will allow them to move faster with their interview process.
  • Clean Design
  • Intuitive Experience
  • Easy of Use
  • Randomness on the tests
Codesignal is a great platform. It has a clean and relatively intuitive design. Users are able to interact/use it very easily. The issue is that during the coding tests, the problems can be very random. Sometimes, it's very hard other times it's very easy. I'm not sure how one would balance these issues, but it's an issue.
November 23, 2022


Jay Dangar | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User
I like solving problems with CodeSignals as they are quite unique another part that I like the most about CodeSignal is its general coding assessment is the most useful tool which I find to simulate a live coding environment.
  • code completion
  • innovative problems
  • coding assessment
  • More coding assessments
  • tutorials to solve the problems
I like the general assessment which helped me clear and be able to assess the situation and make more precise decisions.
November 23, 2022

Satisfaction guaranteed

Score 8 out of 10
Vetted Review
Verified User
Satisfaction guaranteed and definitely.
  • Easy to use, set up, and configure.
  • User-friendly UI.
  • Adding notes to facilitate the exchange of candidates' information between applicants' users.
  • The applicant design is not up to date, needs some additional customizations.
  • Can be a bit hectic when the numbers of applicants increase, to manage price.
  • Mailchimp support has been a bit lacking.
There is no way to carry out campaigns simultaneously with the collaboration of more people. The campaigns are automatically saved in the Mailchimp could while they are being created, in order to save information, however, this campaign cannot be edited by several people at the same time, as it would throw an error. I would like to be able to edit campaigns together with my colleagues, since that way we would obtain better results with the collaboration of more people.
Kush Gumber | TrustRadius Reviewer
Score 10 out of 10
Vetted Review
Verified User
I've used it in the interviewing process for my company for the process of hiring when I applied for the job and we are still using it for the purpose of hiring other candidates. It's mainly used to find out interesting coding problems and given to the candidates for solving.
  • Problems provided are appropriate and challenging
  • Hiring process
  • Helps in overall still building
  • Better explaining the problem statement
  • Can never stop getting better and more interesting problems
  • Ranking system
In overall hiring process and finding problems for candidates for solving. CodeSignal is an interesting platform to have well defined problems statements to be solved wherein the explanation of the problem in case of failure to solve it is also provided. The scoring system is fantastic and the explanation is elaborative and clear.
Score 9 out of 10
Vetted Review
Verified User
We used Codesignal during our interview process, which allowed us to effectively and quickly evaluate candidates for our core software engineering requirements. Especially for a startup with very few resources, it becomes imperative to have correct filtering tools at your disposal to automatically reduce the pool of applicants to invest in the interview time of the engineers; Codesignal helped us achieve this and scale our team within a month.
  • Developer assessment.
  • Skill evaluation.
  • Coding score.
  • Web Interface.
As I mentioned in my previous answer, when you have a small team and a high time crunch, and you don't want to invest your resources in interviewing a larger pool of candidates, Codesignal helps you get a comprehensive judgment about candidates and filter out the best ones suited for the job thereby effectively reducing interview time for the team.
Score 9 out of 10
Vetted Review
Verified User
We use CodeSignal to enable easy code demonstration between current and future employees. The problems it addresses deal with creating a bridge between two users to allow code to be shared and displayed easily. Most use cases deal with interviews and new hires, but code demonstration is applicable to current employees as well.
  • Low latency.
  • Good layout.
  • Easy for interviewees to use.
  • Simple view option with problem description and terminal.
  • Use of external IDE.
  • Color schemes.
Perfect for interviews with potential candidates. They are super easy to use and set up with them. Also has good, but less effective use cases for demonstrating code with colleagues.
October 27, 2022

Good platform.

Score 8 out of 10
Vetted Review
Verified User
Used it to participate in a coding interview for a software engineering position. Found it extremely convenient and easy to use; no real downsides to using it. Great debugging functions, no bugs, and everything worked as it should have. Would suggest other reviewers use this platform also. Overall great experience.
  • Debugging support.
  • Dark mode.
  • Allowing to test before submitting.
  • Quicker run times.
  • Anti cheat system.
  • Hints and tips.
Well suited in automated coding interviews.
Kajal Singh | TrustRadius Reviewer
Score 8 out of 10
Vetted Review
Verified User
My work does not require me to use CodeSignal. I have been using it to practice coding problems and prepare for my interviews. This has been useful for me to do a guided set of problems belonging to a coding category.
  • It has IDE, which helps you put debugging statements and run code which helps to find bugs or verify results when practicing coding.
  • It also has dedicated Java Spring-related questions that mimic what is being worked on in the real-world (Creating APIs etc.).
  • It definitely lets import/support more libraries than other coding platforms out there.
  • It needs to expand its use case to another actual working environment beyond Java and spring (not sure if it supports everything today).
  • The ones which have 3 or 4 questions to be completed within 1 hour is really bad for people who code in Java and provide a HUGE advantage to people who code in python.
  • Modify the question based on the language chosen; only then the time limit will make sense.
It is less suited for the case where one uses Java and has to deal with so much verbosity. Then it makes no sense to compare people who choose java with people who choose Python.
Score 9 out of 10
Vetted Review
Verified User
Codesignal helps us select interns. We apply tests for them, and it provides valuable information about the skills of the candidates. This method allows us to concentrate on social skills rather than technical skills. And it also prevents candidates who are not ready to be part of our team from reaching presential interviews.
  • Evaluate technical skills.
  • Evaluate logical reasoning.
  • Evaluate candidate speed.
  • Browsers compatibility.
  • Natural language support.
  • Pseudocode support.
CodeSignal is very well suited when you want to get fast and accurate feedback about a candidate's technical skills. It allows you to concentrate on other aspects of the candidate, like social skills, and filter candidates that are not technically ready for the challenge. It's not so appropriate to evaluate logical reasoning.
Score 9 out of 10
Vetted Review
Verified User
I use it to solve home assignments and review my code, and in general, I use it to solve multiple problems to improve my problem-solving techniques and mindset as well I use it to practice for my interviews. The product offers many questions that appeared in many companies, and it is well organized and helpful, so I can take questions from there and practice them or interview candidates with those questions.
  • Problems variety.
  • The design and UI of the website.
  • The environment of the coding and testing is done very well.
  • Offer solutions for the problems.
  • Open a blog for discussion.
  • Reveal the test cases for the user to debug the code faster.
  • Offer more ui design for the user to choose as he like.
Code signal is well suited for interview preparations and for companies as well to prepare questions from the site, but in my opinion, it is less suited for competition challenges. I think you should offer some coins or a cash reward for the highest positions in the competition to promote the product and attract more users.
Score 9 out of 10
Vetted Review
Verified User
Used it as an interview tool to assess in a trusted and secure manner the performance of me as a software engineer. This took guaranteed I didn't cheat, maintaining trust between my interviewer and I. It also provided me with amazing coding tools to make my experience as smooth as possible.
  • Coding tools for developer
  • Monitoring tools for interviewer
  • Programming language diversity
  • Tutorials are confusing
Codesignal is well suited for technical assessments of new hirees. If you are interviewing a new software engineer, code signal is an amazing tool to accurately assess their performance while having full trust of their skills and making sure the participant is not cheating. I highly recommend it if you are an interviewer.
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