What Codility Actually Does
Codility sells software companies a simple, stubborn idea: if you want to know whether an engineer can code, watch them code. Its platform replaces the whiteboard ritual with structured, remote assessments that score candidates on real programming tasks - measuring not just whether a solution works, but how efficiently it runs.
Founded in 2009 by Grzegorz Jakacki, a competitive programmer trained at the University of Warsaw, the company grew out of a personal frustration. Working as a senior engineer in Beijing, Jakacki disliked judging candidates on marker-and-whiteboard puzzles that had little to do with the job. The fix he built - test people on real code, remotely - arrived roughly a decade before remote hiring became routine.
Today Codility is a B2B SaaS platform used by talent and engineering teams to screen, interview and map technical skill. Candidates solve role-specific tasks in a browser-based coding environment; hiring teams get consistent, comparable scores instead of gut feel. The platform supports many programming languages and difficulty levels, and its assessments are graded on correctness and performance together.
The company positions itself as a platform that "assesses and advances technical skills in an AI-driven world" - a mission that has widened from pure screening toward understanding the skills a whole engineering organisation holds.
Who Uses It
Codility's marketing points to more than 20,000 engineering teams and 15 million-plus developers assessed - a customer base weighted toward enterprises that hire engineers in volume and cannot afford inconsistent interviews.
Scale Hiring
Named users have included GitHub, SpaceX, Tesla, SAP, Unity, Zalando and Dolby - teams that screen large candidate pools against a consistent bar.
Regulated Rigor
Barclays, Citi, EY, LSEG and GM Financial sit among customers where standardized, auditable assessment matters.
Unity
Ran 750 candidate tests across 90 days on Codility, reportedly saving around 2,200 engineering hours in screening.
The through-line: organisations doing high-volume or senior technical hiring, where the cost of a bad screen - or an inconsistent one - compounds quickly across teams and geographies.
The Problems It Solves
Technical hiring is expensive, slow and easy to get wrong. Resumes overstate skill, whiteboard interviews test nerves as much as ability, and every interviewer applies a slightly different bar.
Codility attacks three failure points. First, screening: it filters candidates on demonstrated coding ability before anyone spends interview time. Second, consistency: every candidate faces comparable, scored tasks, which reduces the noise of ad-hoc questions. Third, scale: teams can assess hundreds of applicants without booking hundreds of engineer-hours.
Its integrity tooling - plagiarism detection, session playback, and network, device and typing-pattern signals - exists to keep those scores trustworthy, a job made harder by the rise of AI coding assistants.
How It Stands Apart
Codility competes with HackerRank, CodeSignal, CoderPad, TestGorilla and DevSkiller. In a crowded field, its reputation leans on assessment rigor and enterprise credibility rather than the largest public question bank.
Where rivals emphasize sheer library size or standardized certified scores for early-career volume, Codility is often chosen for experienced and senior roles where custom assessment design matters, and by European enterprises attentive to compliance. Its differentiation is less "more questions" and more "defensible measurement."
That posture shows in its research output. Codility's COMPASS benchmark for AI-generated code - built on roughly 400,000 real human submissions to its contests - was accepted at the ACM FORGE 2026 conference, a credibility signal competitors tend to answer with blog posts rather than peer review.
The Toolkit
CodeCheck
Automated, role-specific coding assessments that screen candidates before interviews, scored on correctness and performance.
CodeLive
Live technical interviews in a shared real-code editor with pair programming, live execution and full session recording.
CodeEvent
Gamified, high-volume coding events built for campus recruitment and hackathons.
Skills Intelligence
Verified skills mapping for existing teams - identifying gaps, benchmarking and supporting workforce planning.
AI Copilot
Brings AI-assisted coding into interviews so teams can assess how engineers collaborate with AI, not just around it.
Codility Lessons
Seventeen public algorithm lessons - Binary Gap, Prefix Sums, the Caterpillar Method - used worldwide for interview prep.
Business Model & Backing
Codility runs on recurring B2B subscriptions. Enterprises pay for platform access - assessments, interviews and skills intelligence - with ATS integrations and API access wiring it into existing hiring workflows.
The financial story is unusual for a software company: Codility bootstrapped for roughly ten years, reaching double-digit-million recurring revenue before taking a dollar of venture money. Its $22M Series A, led by Oxx and Kennet Partners, only arrived in January 2020.
Seedcamp
Small early backing from Seedcamp during the bootstrapped years.
$22M
Led by Oxx and Kennet Partners to expand enterprise screening. Total disclosed funding is around $24.5M; valuation was never officially confirmed.
Where It Fits
Codility sits in the technical-assessment corner of HR technology - a market being reshaped in real time by generative AI. Its edge is depth in assessment science: how to design tasks that measure real ability, resist gaming, and stay fair across candidates.
When AI coding tools threatened to make take-home tests trivial to cheat, Codility's response was two-sided. In 2023 it launched what it billed as the first AI-resistant assessment library, tagging tasks by how easily generative AI could solve them. Then it inverted the problem: rather than only blocking AI, it built ways to measure how well engineers work with it, via an AI Copilot inside interviews.
That dual stance - integrity plus adaptation - is the company's read on where hiring is heading. As it notes, the share of students admitting to AI use on tests jumped from 53% in 2024 to 88% in 2025. The skill being hired for is changing, and Codility is betting the assessment has to change with it.
Timeline
- 2009
Codility is founded
Grzegorz Jakacki starts the company to test programmers on real code instead of whiteboards.
- 2010
Free Lessons published
Public algorithm lessons launch and become a popular interview-prep resource for developers.
- 2019
Panowicz named CEO
Co-founder Natalia Panowicz becomes CEO after rising from business developer to COO.
- 2020
$22M Series A
Oxx and Kennet Partners lead the first outside funding after a decade of bootstrapping.
- 2023
AI-resistant assessments
Launches an assessment library tagged for resistance to generative-AI solving.
- 2024
AI Copilot in interviews
Adds AI-assisted coding to interviews to assess human-AI collaboration.
- 2026
COMPASS at ACM FORGE
Its benchmark for AI-generated code is accepted at the ACM FORGE 2026 conference.
The Team
Codility employs roughly 115 to 140 people and has been remote-first and distributed since 2020, describing itself as a "human-first" workplace. Its team spans around 11 countries and 18 languages, with in-person gatherings organised by function.
Leadership traces back to the founding team. CEO Natalia Panowicz joined as a business developer in 2012, became COO in 2014, and took the top job in 2019 - a customer-facing route to the corner office. Founder Grzegorz Jakacki remains connected to the company he started.
Worth Knowing
◆ The "Binary Gap" task in Lesson 01 is a rite of passage for interview-preppers.
◆ Codility scores code on efficiency, not just whether tests pass.
◆ The whole company began with one engineer's dislike of whiteboard interviews in Beijing.
◆ COMPASS was built on ~400,000 real human contest submissions.
Frequently Asked
What does Codility do?
Codility is a technical hiring platform that lets companies assess software engineers' real coding skills through automated assessments, live interviews and skills-intelligence tools.
Who founded Codility and when?
It was founded in 2009 by Grzegorz Jakacki, with co-founders including Natalia Panowicz (now CEO) and Tomasz Walen.
How much funding has Codility raised?
Codility raised a $22M Series A in January 2020 led by Oxx and Kennet Partners, after roughly a decade of bootstrapping. Total disclosed funding is around $24.5M.
Who are Codility's competitors?
Its main competitors are HackerRank, CodeSignal, CoderPad, TestGorilla and DevSkiller.
What are Codility Lessons?
Codility Lessons are a free public set of structured algorithm tutorials and practice tasks - such as Binary Gap and Prefix Sums - widely used by developers to prepare for coding interviews.
Links & Media
Find Codility
Compiled from public sources including TechCrunch, PR Newswire, Crunchbase, Kennet Partners and Codility's own site. Financial and headcount figures are approximate where noted.