Give candidates a clear way to show their skills
Candidates see the task, time limit and AI rules up front. 9 in 10 say they had a fair chance to show their skills.
Codility candidate feedback survey, October 2025 to April 2026, 46,204 responses to this question.
Validated assessments since 2009 48,000+ candidate responses in 6 months
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Before the assessment
An invitation gives the assessment name, time and deadline. The intro page sets the instructions and AI rules before the timer starts. 90% of candidates say the instructions for using AI were clear.
Codility candidate feedback survey, October 2025 to April 2026, 34,532 responses to this question.
Interview candidates can run a practice interview first, so the shared environment is familiar before the session that counts.
Assessments run in a supported web browser with nothing to install. Where the hiring team enables hidden app detection, candidates install the lightweight Codility desktop app for that assessment and are told in advance.
During the assessment
Engineering candidates
Engineering candidates work in a coding environment with the languages and frameworks the task calls for. Project work runs in VS Code with a terminal and tests, and, when your team enables it, the AI Assistant, Claude Code or Codex.
Business candidates
Business candidates read the brief with source files and spreadsheets open beside it, work with the assistant and submit a written response. Tasks run 5 to 60 minutes.
Source: Codility business task library.
A visible timer shows the time remaining, and work is saved as the candidate goes. Hiring teams can configure accommodations such as extended time for a candidate who needs it.
What candidates report
48,432 candidates answered Codility’s anonymous post-assessment survey between October 2025 and April 2026. Every figure on this page carries the number of responses to its question.
9 in 10
say the assessment content is fair
Codility candidate feedback survey, October 2025 to April 2026, 48,000+ candidate responses.
87%
rate their Codility experience good or excellent
Codility candidate feedback survey, October 2025 to April 2026, 48,000+ candidate responses.
86%
say the assessment evaluated their skills well
Codility candidate feedback survey, October 2025 to April 2026, 47,496 responses to this question.
90%
say the assessment gave them a fair chance to show their skills
Codility candidate feedback survey, October 2025 to April 2026, 46,204 responses to this question.
6 in 10
Candidates who score low still rate it well
The candidates your team turns down are the ones who talk about your process. Among candidates who believe they scored below half, 6 in 10 still rate the experience good or excellent. Among those who believe they scored above 75%, it is 92%.
Codility candidate feedback survey, October 2025 to April 2026, 951 candidates who estimated their score below 50% and 4,626 who estimated it above 75%.
90%
Candidates who know other platforms rate Codility higher
Candidates who have used another online coding environment rate Codility higher on all six survey measures than candidates taking their first online assessment. 90% rate the experience good or excellent. They score skills evaluation 4.7 points higher and real-world relevance 8.2 points higher.
Codility candidate feedback survey, October 2025 to April 2026, about 5,700 candidates who named another online coding environment they had used, compared with about 16,000 for whom Codility was the first.
93%
Fairness holds across groups
93% of women candidates say the content is fair, above the 91% overall. Fairness ratings stay above 83% in every ethnic group surveyed.
See fairness and adverse impact analysis
Codility candidate feedback survey, October 2025 to April 2026, 9,007 women and every ethnic group with at least 100 responses.
What candidates say about the tasks
86%
say the assessment evaluated their skills well
Codility candidate feedback survey, October 2025 to April 2026, 47,496 responses to this question.
85%
rate the task description 4 or 5 out of 5 for clarity
Codility candidate feedback survey, October 2025 to April 2026, 20,462 responses to this question.
“The assessment was thoughtfully designed and allowed me to demonstrate my problem-solving skills, attention to detail, and ability to work within constraints. The tasks were realistic and relevant.”
Candidate, Codility post-assessment survey
Candidate feedback survey, October 2025 to April 2026
“The focus remained on tackling the questions themselves, rather than dealing with restrictive setup or tooling issues.”
Candidate, Codility post-assessment survey
Candidate feedback survey, October 2025 to April 2026
All figures describe candidate perceptions across Codility assessments, October 2025 to April 2026.
Accessibility and accommodations
The candidate experience meets WCAG 2.2 AA, and a Voluntary Product Accessibility Template, a VPAT, is available to your accessibility reviewers on request. Hiring teams can configure accommodations such as extended time for an individual candidate, set before the assessment starts.
Questions candidates and talent teams ask
Related evidence
See the assessment through your candidates’ eyes
We’ll take you through an assessment from the candidate’s side, engineering or business.