Codility Assessments and Interviews 2026. Full Guide.

1. Introduction

Not sure if you should practice preparing for Codility assessments? According to research, 60-80% of candidates are rejected based on their assessment results. It is proven that practice increases your chances of getting hired.

In a nutshell:

1. Prepare for Codility Assessments

Understand Codility assessments by reading this guide. Ensuring you do this will help you to be aware of:

• The qualities Codility assessment tests measure.
• Tips to help you pass the Codility coding tests.

2. Record Mock Video Interviews of Yourself

Prepare for the Codility interview by practising with mock interviews and answering typical technical interview questions. For Codility interview practice, use the following:

• A smartphone
• Zoom or
• Our video interview practice platform

So, without further ado, let’s get started!

2. Who is Codility?

• Codility was founded in 2009 by Tomasz Bujok and Greg Jakacki, with the mission of helping companies hire developers based on proven technical skills.
• Codility is used by numerous global companies to efficiently evaluate and hire top talent.
• Codility provides a skills assessment and interview platform that enables employers to test candidates through coding challenges, performance, and technical interviews.
• The Codility platform supports assessments in multiple programming languages and includes tasks covering algorithms, data structures, debugging, and performance optimisation.
• Codility’s tools include anti-plagiarism detection, real-time monitoring, and automated scoring to ensure fair and reliable results.
• Codility is dedicated to making technical hiring more efficient, data-driven, and bias-free, helping companies identify candidates who can truly write high-quality and scalable code.

Global companies use the Codility tests to hire good developers. Let’s go ahead and find out which employers use the Codility assessments.

3. Which Employers Use Codility Assessments?

Codility assessments are available globally. Below is a list of top employers that have used Codility online tests to assess candidates in their hiring process for developers:

Amazon	Accenture	Deloitte
Microsoft	Tesla	Avature
Unity	Asseco	Tipico

Let’s go ahead and find out the key reasons why several top employers use Codility assessments to hire developers.

Why Do Employers Use Codility Assessments?

Below are several key reasons why employers choose to use Codility assessments in their technical hiring process:

The Codility online tests also benefit candidates like you. Let’s find out below.

How Do Codility Assessments Benefit Candidates?

Codility assessments give you the following advantages as a candidate:

• A clear and objective way to show your coding skills.
• A chance to demonstrate your problem-solving and coding skills, as the Codility tests are job-relevant.
• It helps you stand out in a competitive job market by using a skills-based platform.
• Codility offers a fairer playing field across applicants because the tests are standardised.
• It gives you a realistic preview of the kind of coding challenges you might face in the role. This helps you evaluate whether the job truly fits your skills and interests. 

Now, let’s go ahead and talk about the Codility assessments that top employers may use during their recruitment process.

4. Codility Assessments

What are the Codility assessments?

Codility assessments are online coding tests designed to evaluate your technical and problem-solving skills through programming tasks. They are widely used by employers to screen and shortlist developers before interviews.

What do Codility assessments measure?

Codility assessments measure your coding ability, problem-solving skills, and code efficiency. Employers use Codility to see how well you can write correct, clean, and working code to solve programming challenges.

Let’s go ahead and examine the various types of Codility online tests you may face.

Types of Codility Assessments

The main types of Codility assessments are:

Read on to uncover our best tips to help you prepare and pass the Codility online tests.

5. How to Pass Codility Assessments

Consider our following best tips to help you face and ace the Codility coding tests.

Top 10 Tips to Pass the Codility Assessments

1. Understand the test format. Expect timed coding challenges that assess algorithmic thinking, problem-solving, and code efficiency.
2. Practice on Codility’s sample tasks. Use the Codility practice platform to get familiar with their interface and question style.
3. Practice regularly. The more you solve Codility-style problems, the better you’ll recognise patterns and write efficient solutions faster.
4. Focus on correctness and performance. Write code that works for all test cases before optimising for time and memory efficiency.
5. Revise key algorithms and data structures. Prepare on topics like arrays, strings, recursion, sorting, searching, dynamic programming, and graph algorithms as they’re commonly tested.
6. Test locally before submitting. Use edge cases to ensure your code handles all scenarios.
7. Watch time limits and complexity. Codility evaluates efficiency, so avoid overly complex or slow solutions.
8. Use clean, readable code. Write clear logic with descriptive variable names. Employers often review your code manually, too.
9. Stay calm under pressure. Manage your time by not getting stuck on one problem for too long. Partial solutions can still earn points.
10. Ensure to submit your own work. Codility has anti-plagiarism and similarity detection, so always submit your own work.

Prepare for Codility assessment tests with our practice coding knowledge tests!

Aside from the technical assessments, Codility also provides a technical interview tool that companies may use. Let’s find out more about this below.

6. Codility Interview

What is the Codility interview?

The Codility interview is also called a live coding interview. It is a technical interview platform that allows interviewers and candidates to collaborate on coding problems live in a shared environment.

What does the Codility interview measure?

The Codility interview measures your ability to:

• Write correct and efficient code in real time.
• Think logically and solve problems under moderate time pressure.
• Communicate your reasoning and explain coding decisions clearly.
• Collaborate effectively with interviewers while debugging or refining solutions.
• Apply practical programming knowledge to role-specific challenges.

Read on for our top tips to ace the Codility live coding interviews.

Top 10 Tips to Pass the Codility Interview

1. Familiarise yourself with the Codility interview platform. Practice running code, using the editor, and testing solutions on Codility’s practice platform.
2. Revise core technical concepts. Review data structures and algorithms, as these are commonly tested.
3. Practice live coding. Simulate real interviews using platforms like Codility Practice, LeetCode, or HackerRank, while explaining your logic aloud.
4. Think aloud. Interviewers assess your communication and reasoning, not just your final answer. Explain your approach, trade-offs, and why you chose a certain solution.
5. Start simple, then optimize. Write a working solution first, even if it’s not optimal. Once correct, improve performance and explain how you’re optimising it.
6. Ask clarifying questions. Before coding, confirm your understanding of the problem and any constraints, as it shows structured thinking and avoids wasted effort.
7. Write clean and readable code. Name variables clearly, use consistent indentation, and comment briefly if needed. Interviewers look for clarity and maintainability.
8. Handle edge cases. Test your code with special cases, e.g. empty arrays, duplicates, and large inputs, to show thoroughness.
9. Stay calm under pressure. Manage your time wisely and don’t panic if you get stuck. Discuss your thought process and alternative approaches.
10. Collaborate naturally. Treat the interviewer as a teammate. Engage in discussion, accept hints, and adapt your solution based on feedback.

Get accustomed to virtual interview environments similar to the Codility interview with our interview practice tool!

With this, we have covered everything you’ll need to know about Codility assessments. But wait, before you go!

Don’t miss our quick FAQs section below, which covers other common questions people ask about Codility assessment tests.

7. Codility Assessment FAQs

This article was last updated in 19 November 2025. All information provided is accurate to the best of our knowledge as at the time of publication, based on publicly available sources. For the most up-to-date details, kindly verify directly with Codility.