Codility is one of the most established names in technical screening, and for a certain kind of hiring problem it still earns its place. If you're running high-volume engineering recruitment and need a consistent, defensible way to measure coding skill before you spend interviewer time, it's a serious tool. Whether it's the right fit depends on what problem you're actually trying to solve. Codility is a technical screening and coding-assessment platform, founded in 2009 by Grzegorz "Greg" Jakacki. The origin story is the honest one: an engineer tired of losing days to whiteboard interviews that didn't predict much, who built a way to measure coding ability more objectively. That focus stuck. The company bootstrapped for a full decade before taking outside money. In January 2020 it raised a $22M Series A led by Oxx and Kennet Partners — its first institutional funding after ten years of double-digit growth on its own revenue (TechCrunch). That's a rare and telling history: the product had to pay for itself before investors ever got involved.

Scale is where Codility is unambiguous. The company reports 30,000+ candidate evaluations facilitated monthly, 1,500+ customers operating across 63 countries, and 10M+ engineers evaluated through the platform to date (codility.com). Back in 2019 alone it helped 1,500 customers assess over 455,000 developers (TechCrunch). The named client roster is genuinely heavyweight: GitHub, SpaceX, Tesla, EY, SAP, Barclays, Citi, Unity, and Okta, among others (codility.com). These are companies that hire engineers by the hundreds and need a screening process that holds up to scrutiny. The product splits into two parts. CodeCheck is asynchronous, role-specific screening — candidates complete tasks from a customizable library before a human ever gets involved. CodeLive is the live side: a collaborative editor and whiteboard for conducting real-time technical interviews.

Objective, standardized measurement. Every candidate for a role gets the same tasks scored the same way. For teams that care about consistency and defensibility — especially large enterprises with compliance obligations — that's the whole point. Enterprise-grade trust. Codility carries ISO 27001, SOC 2, and GDPR compliance, EEOC alignment, and states EU AI Act readiness (codility.com). If your legal and security teams have to sign off on a hiring tool, this is the kind of paperwork that clears the room. Real time savings at volume. In one published case, Unity ran 750 candidate tests and reported roughly 2,200 hours of interview time saved (codility.com). When you're filtering a large top-of-funnel, that math compounds fast. Adaptation to the AI era. Codility now lets teams assess candidates working with or without AI coding tools, rather than pretending AI assistance doesn't exist. That's a sensible response to how engineers actually work in 2026. It holds a 4.6/5 rating on G2.

Codility measures the candidates who show up and take the test. It's a screening layer, which means it works best when you already have a healthy flow of applicants to filter — the tool sharpens your funnel, it doesn't fill it. If your problem is finding strong engineers rather than ranking the ones who applied, an assessment platform is solving a different half of the equation. It also measures coding skill in a scored task, which is real signal, but distinct from watching someone reason through an ambiguous, open-ended problem the way they'd actually build. For many roles the score is exactly enough. For senior or highly specialized hires, it's one input among several. And the assessment stops at the score. Sourcing, offers, and everything involved in actually employing the person remain yours to run.

Here's the thing an assessment can't do: the best AI engineers never take one. The person you actually want isn't sitting in an applicant pool waiting to be scored — they're already working, booked on a contract somewhere else, heads-down, and they're not filling out a coding test for anyone. Nextdev reaches the top 1% of AI engineers — the ones who aren't looking. We find them. Then we give each a real problem to build and watch how they actually work, so you know they're AI-native because you've seen it, not because a score said so. And when you want one, we employ them for you: one named engineer, the contract and payroll and compliance never touching your desk. A test tells you how someone did on a test. It still leaves you to source the candidate and run the employment yourself. We do all three — reach, proof, done. You're not picking from who signed up and passed. You're getting the engineer who never would have.

Codility is a strong, well-built screening platform with a long track record and a client list that speaks for itself. If your bottleneck is filtering a large flow of applicants fairly and fast, it's one of the safest choices you can make. If your bottleneck is getting the right engineer into the seat — sourced, proven on real work, and employed — that's a different job, and it's the one Nextdev does.