Highlights time complexity issues.

Can rewind and check how the code was written step by step. Review collected by and hosted on G2.com.

Provide option to show hidden test cases if candidates get stuck on it for a longer time.

Debugging features can be improved. Review collected by and hosted on G2.com.

the interface, the ease of navigation and the way we can practice too with sample practise problems to familiarise with the platform. Review collected by and hosted on G2.com.

only downside i can see is not having many practice question, but that is expected. Review collected by and hosted on G2.com.

UI is simple and straightforward for candidate to login and access the platform. I have been using this platform atleast once a week. Haven't required to reach support so far, has been a smooth experience. Review collected by and hosted on G2.com.

I wish there can be 1+ tasks with plain text editors for more flexibility. Because in some interviews for multiple tasks we prefer no syntax help, that is a restriction currently. Review collected by and hosted on G2.com.

It's easy to use, and it also automatically detects any suspicious activities. Review collected by and hosted on G2.com.

I think, proctoring is not possible in codility, meaning we should be able to live proctor the assessment, that would be handy for me. Review collected by and hosted on G2.com.

Great platform for taking the interviews. Saves a lot of time. Review collected by and hosted on G2.com.

It can have more AI related features. The ways to check any malpractices will be better. Review collected by and hosted on G2.com.

What I like most about Codility is that it lets me create customised tests and use them to screen employees and candidates efficiently. Review collected by and hosted on G2.com.

Maybe the test level could be improved so it better assesses candidates. Review collected by and hosted on G2.com.

What stood out to me from the start was how Codility lets you focus on what really matters—understanding how a candidate thinks, solves problems, and writes code under time pressure. It’s not just about getting the right answer. You get a real sense of someone’s logic, coding style, and approach to debugging.

I’ve been using Codility as part of the hiring team at Zalando, where I work as a Senior Software Engineer in Berlin. We’ve used it to assess candidates for different roles, especially in the early screening stages. And honestly, the platform has made that process a lot smoother.

The timeline feature is one of my favorites. It shows how the candidate progressed through a task—from when they started, to when they copy-pasted code, or paused—helping us understand their thought process better. It’s been a great way to tell whether someone rushed, took time to plan, or struggled at a certain step.

Another big plus: the detailed playback view. You can actually replay how a candidate solved the task, with the question and code side by side. This keeps the evaluator in the right context and helps us evaluate not just what the candidate wrote, but how they arrived at the solution.

The platform also flags suspicious activity, like tab-switching or copy-pasting, which adds another layer of insight during evaluations. And the dashboard shows per-task scores, time taken, and complexity indicators. All of this helps us go beyond just a score and look at the full picture.

Codility does a solid job for backend and general coding assessments. The test variety includes real-world engineering challenges, and live sessions have worked well for remote interviews—we’ve had good experiences collaborating with candidates live and observing how they think out loud. Review collected by and hosted on G2.com.

The UI can feel quite cluttered. There’s a lot of information packed into the dashboard, but not all of it feels necessary—or easy to navigate. Sometimes it’s hard to focus on what really matters.

Also, as a frontend-heavy team, we’ve often felt that Codility leans too much towards backend-style assessments. There’s limited support for evaluating real-world frontend skills—things like async logic, UI reasoning, or performance trade-offs. We've had to build and use custom tasks outside the platform just to evaluate frontend engineers more effectively.

While Codility does surface things like time complexity for solutions, a human review is still necessary to judge the actual quality of the code—especially for senior roles. Review collected by and hosted on G2.com.

One thing I really liked about the recent updates in Codility is how much smoother and more intuitive the interface has become—it feels cleaner and easier to navigate, especially under time constraints. The questions also seem more practical now, focusing on real-world scenarios rather than just theoretical algorithms, which makes the experience more relevant. I also appreciated how the platform handles different programming languages better, especially with modern C++ features that used to cause issues earlier. The test reports are now more informative too, making it easier to understand where you went wrong—whether it was performance, logic, or edge cases. Plus, being able to review practice problems on mobile is a small but handy touch. Review collected by and hosted on G2.com.

Yes, there are a few areas where Codility can still improve. Sometimes the execution environment feels a bit slow, especially when running multiple test cases or handling larger inputs—it adds unnecessary pressure during timed assessments. Also, while the real-time feedback is useful, it would be great if it included a bit more context, especially when something fails unexpectedly (like segmentation faults or timeouts). Another improvement could be in the code editor itself—basic features like auto-complete, function hinting, or even dark mode would make coding more comfortable. Lastly, the question difficulty can vary a lot, even within the same test, so a more balanced progression in complexity would make the overall experience fairer. Review collected by and hosted on G2.com.

It's great to see how Codility keeps evolving. Building on my previous positive experiences, I've recently been impressed by a few new things that make the platform even better:

- The Introduction of Real-Life Tasks: What I really like now is the move beyond traditional algorithms. They have introduced tasks that mirror actual day-to-day work for a developer, like debugging an existing block of code, refactoring it for better performance, or working on a small feature within a larger project. This feels much more practical and relevant to the actual job, making the assessment a more engaging and fair evaluation of my real-world skills.

- Enhanced AI-Powered Assistance: The platform's autocompletion and code-writing assistance have become noticeably smarter. It’s not just about finishing a line of code; it feels more like an AI pair programmer. It provides more context-aware suggestions and helps catch silly mistakes on the fly, which lets me focus on the core logic of the problem rather than getting bogged down by syntax. This makes the coding process smoother and faster.

- Improved Candidate Feedback and Insights: After completing a test, the feedback provided seems more detailed than before. Instead of just a score, there's a better breakdown of performance, correctness, and efficiency. Seeing this granular feedback helps me understand my strengths and pinpoint specific areas for improvement, which is incredibly valuable for my personal development.

While I've always appreciated the platform's stability and support, these recent enhancements show a commitment to creating a more modern and practical assessment experience. It feels less like a generic test and more like a simulation of a real coding environment, which is something I genuinely like. Review collected by and hosted on G2.com.

High-Pressure Environment: The timed nature of the tests, combined with camera and screen monitoring (proctoring) in some cases, can create a stressful and unnatural coding environment. This pressure can hinder performance, not always reflecting a candidate's true ability to solve problems in a real-world, collaborative setting.

IDE Limitations: Although the built-in editor is good, it can feel restrictive compared to the fully customized local IDEs (like VS Code or IntelliJ) that developers use daily. The lack of familiar shortcuts, extensions, and debugging tools can be frustrating and slow down the coding process. Review collected by and hosted on G2.com.

I use unit tests and code-quality checks with unittests. Review collected by and hosted on G2.com.

It should include a more user-friendly explanation of the problem, instead of showing only a brief text message. Review collected by and hosted on G2.com.