Log in Talk To Us

Developer screening without a live first round_

Codility Screen gives candidates a role-mapped engineering task in a realistic environment. Your talent team can review assessment results in a connected applicant tracking system (ATS) before booking technical interviews.

  • Codility’s library contains 1,300+ validated engineering tasks, designed by assessment engineers and reviewed by occupational psychologists.
Book a 30-minute demo
Candidates Screen
Backend Engineer II · req 4471
Search candidates
Cut score 70
CandidateTask setScoreStage
A. Novak Backend Core 92 Shortlisted
M. Iyer Backend Core 88 Shortlisted
T. Okafor Backend Core 84 Shortlisted
12 def resolve(events):
13 window = deque()
14 for e in sorted(events):
15 prune(window, e.ts)
16 yield merge(window, e)
Test cases 18 / 18
Correctness 90
Performance 78
Integrity risk level: low
J. Reyes Backend Core 61 Below cut
Ranked Screen results, with one candidate’s submitted output expanded.

Global enterprises that trust Codility include

Trusted by GitHub, SpaceX, Tesla, EY, LSEG, SAP, Barclays.

G2 Leader, Enterprise, Fall 2026
G2 Best Estimated ROI, Enterprise, Fall 2026
G2 Most Implementable, Enterprise, Fall 2026
G2 Leader, Mid-Market, Fall 2026

Today’s failing approach: resumes and live screens determine your shortlist

Resume-based selection

A recruiter judges technical ability from an application. A strong engineer with a weak resume can be rejected before demonstrating a skill.

Engineering time

A live first-round screen requires an engineer and a candidate to find a shared time.

Different assessment criteria

Homegrown tasks and marking criteria can vary by team. Comparing candidates becomes harder when the assessments differ.

Incomplete decision records

Screenshots and interview notes may leave your team unable to explain the evidence behind a rejection.

Build a shortlist from demonstrated engineering skills

Developer screening is the stage between an application and a technical interview. Codility Screen helps your team use submitted task output to decide which candidates advance.

Assess candidates without scheduling a live session

Live first-round screens require shared calendar time. Screen assessments run asynchronously, so candidates can complete their tasks independently.

You choose tasks that match the role, with technologies including React, Spring Boot, Kubernetes, Terraform and Spark. Your team can apply the same task set to candidates for the same role.

The difference: Your team can assess technical ability before reserving an engineer’s interview time.

Assessment completion Asynchronous
Backend Engineer II · req 4471

1,284

Invited

1,102

Submitted

6 days

Elapsed

A. Novak 92
M. Iyer 88
T. Okafor 84
S. Lindqvist 79
D. Haas 73
Cut score 70 Same task set for every candidate on this role
Assessment completion for one role, with submitted results ranked.
Code Evolution Chart Replay
T. Okafor · task 3 of 4
28 if attempt.retries > MAX:
29 return Result.dropped(attempt)
30 key = idempotency_key(attempt)
31 with lock(key, ttl=30):
32 if store.seen(key):
33 return store.get(key)
34 return charge(attempt)
Assessment events 18:24 / 41:07

Run tests · file saved · task opened

Test cases

Correctness · base6 / 6
Correctness · edge7 / 7
Concurrency3 / 3
Performance2 / 3

Task score

84

The Code Evolution Chart alongside submitted code and test-case results.

Review the code behind each result

A score alone gives an engineer limited context. Automatic scoring on selected Codility tasks evaluates output against defined test cases. The Code Evolution Chart shows code changes alongside assessment events, so reviewers can inspect how the candidate developed the solution.

The difference: Your engineers can inspect the submitted code and test-case breakdown when reviewing a shortlist.

Apply shared criteria across teams and regions

Separate team processes can produce different thresholds for the same role. You set the task set and cut score your hiring team will use. Deterministic task scoring gives identical submitted output the same result.

Integrity controls return reviewable signals, including identity and similarity checks. Your reviewers assess the evidence and decide who advances.

The difference: You can explain each candidate’s result against the criteria used for that role.

Candidate report Above cut score
T. Okafor · Backend Engineer II

Task result

84

Cut score for this role

70

Score breakdown
Correctness 90
Performance 78
Code quality 82
Integrity evidence
Identity check Verified
Similarity check No match found
AI Assistant Disabled for this assessment
Reviewer decision Advance to technical interview
A candidate report with task result, score breakdown and integrity evidence.
Book a 30-minute demo

Screening evidence your engineering team can inspect

Codility shares its technical manual with prospective and existing clients so your team can inspect the assessment methodology.

Chris Weber at Unity reported:

“With Codility, our teams ran 750 candidate tests over 90 days, saving 2,200 hours of interview time. That kind of productivity is like gaining time to launch an entirely new product or enter a new vertical.”

Source: Unity customer story.

Questions about developer screening

What is developer screening?

Developer screening assesses technical ability before the live interview stage. Codility Screen supports that stage with practical engineering tasks and results your team can review.

Review your developer screening process with Codility

Bring one open role. We’ll discuss the assessment and evidence your team needs before booking technical interviews.

Book a 30-minute demo

Your roles, your task sets, your ATS.