Codility: Assessment Format and How to Practise

Codility is a technical screening platform used mostly for hiring, so the smartest preparation is understanding its format and drilling the underlying concepts on Codility's own practice track — not chasing answers to a live test.

What is Codility?

Codility is a technical screening and interview platform that companies use mainly for hiring software engineers. A Codility assessment is built around Coding Tasks — live programming problems you solve in an in-browser IDE, where your code is auto-graded for correctness and performance, with time and space complexity measured. A test usually contains two or three tasks and can also include domain Multiple-Choice Question sets (typically ten theory-and-practice questions, automatically scored) and Multiple-Response Questions that allow several correct answers. SQL and front-end Web tasks are coding-style tasks too. Codility also offers free practice exercises and a sample demo test that anyone can attempt without applying for a job. This guide is about understanding that format and practising the concepts behind it — data structures, algorithms and SQL theory — so the platform feels familiar before any real screening.

Question types you'll see on Codility

Multiple Choice — Codility MCQ sets are domain knowledge checks — usually ten auto-scored questions mixing theory and practice, one correct option each. These are the objective, single-answer items.
Multiple Response — Codility's Multiple-Response Questions allow more than one correct answer in a set, auto-scored like MCQs. The coding, SQL and web tasks are live programming and are not covered here.

New to any of these? The question-type glossary explains how each format works, with examples.

How to study for it

Treat preparation as concept revision, not answer-hunting. Work through Codility's free practice exercises and the public demo test so the IDE and timing feel familiar. Drill the fundamentals the coding tasks lean on — arrays, strings, sorting, hash maps, recursion, dynamic programming, graphs and big-O complexity — by hand and in your own editor. For the MCQ sets, revise language and data-structure theory the way you would for any exam. Rehearse on practice material under realistic time limits so you are comfortable with the format long before a real screening.

Study for Codility with AI Solve Quiz

While you are practising and learning, AI Solve Quiz helps you understand multiple-choice and concept questions — select a text question for a worked explanation from our text engine, or capture an image and our Gemini vision reader walks through it. It is built for objective, single- or multi-answer questions on practice material only. It does not write or solve code for live coding tasks, SQL tasks or web tasks — that is productive work you are meant to do yourself. Never use it during a real, timed, proctored or hiring assessment; Codility screenings are for evaluating you, and using any aid there breaks the rules.

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For practice and learning only — never during a live, proctored, or graded Codility assessment. See our Academic Integrity Policy.

Frequently asked questions

What does a Codility assessment contain? ▼

Mostly Coding Tasks — live programming problems solved in an in-browser IDE and auto-graded for correctness and performance, usually two or three per test. A test may also include Multiple-Choice and Multiple-Response question sets, plus SQL or front-end Web tasks depending on the role.

Which Codility question types are objective and auto-checkable? ▼

Only the Multiple-Choice Question sets (single correct answer) and Multiple-Response Questions (several correct answers). Coding, SQL and Web tasks are open-ended programming work that you produce yourself, not objective items.

Can AI Solve Quiz help during a real Codility screening? ▼

No. It is for understanding the format and practising concepts on Codility's practice exercises and demo test only. It explains objective multiple-choice and concept questions while you learn; it never writes or solves code, and you must not use it during any real, timed, proctored or hiring assessment.

Other platforms

HackerRank HackerRank is a technical-skills platform with a free practice track and paid hiring assessments. This guide helps you understand how its question types work and practise the underlying computer-science concepts — so you build genuine skill, not shortcuts. CodeSignal CodeSignal is a technical assessment platform many companies use for hiring — which makes it a place to prepare honestly, not to shortcut. This guide explains how CodeSignal is structured and how to practise the underlying concepts on its own learning and practice track, so you walk into a real assessment genuinely ready. Canvas Canvas is the learning management system behind thousands of school and university courses. Here is how its quizzes are built — and how to practise the formats with confidence. Moodle Moodle is the open-source LMS used by schools and universities worldwide. Its Quiz module is famously flexible — here is how its question types work and how to practise them.

Codility is a trademark of Codility Ltd. and is used here nominatively, for identification only. AI Solve Quiz is an independent study tool and is not affiliated with, endorsed by, or sponsored by Codility Ltd.. Product features and question formats change — always confirm details with the official source.