Prelim / Solutions / Technical

Prove real engineering ability.

Whiteboard trivia and take-homes both fail — one is unrealistic, the other is gameable. Prelim measures how candidates actually build, in a live environment your team believes.

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Real repos. Real tasks. Real signal.

Candidates work in a full IDE against realistic problems — reading existing code, designing systems, and shipping working solutions. Specialized assessors grade reasoning and correctness, and anti-cheat flags anomalies without punishing legitimate tooling.

Live, browser-based coding IDE with real repositories
System-design and DevOps exercises, not just algorithms
AI-assisted grading of correctness and approach
Integrity signals that survive the age of AI copilots

87%faster time-to-shortlist

Teams skip the take-home backlog and interview only candidates who already cleared a real technical bar.

What you can assess.

Coding ability

Correctness, structure, and readability on realistic tasks.

Live coding IDE

A full editor with test runners and real repos in the browser.

System design

Architecture and trade-off reasoning, scored consistently.

DevOps & tooling

Practical skills with CI, containers, and infrastructure.

Anti-cheating

Proctoring and integrity signals tuned for the AI era.

Skills matrix

A ranked, explainable breakdown per competency.

Roles commonly assessed.

A sample of the job titles teams use this for.

Software EngineerBackend EngineerFrontend EngineerFull-Stack EngineerDevOps EngineerData EngineerQA EngineerSite Reliability Engineer

Supported languages & frameworks.

The live coding environment covers the stacks your engineers actually use.

Languages

JavaScriptTypeScriptPythonJavaC#C++GoRustRubyPHPKotlinSwift

Frontend

ReactNext.jsVueAngularSvelteHTML/CSS

Backend & Data

Node.jsDjangoSpring.NETPostgreSQLMySQLMongoDBRedisGraphQLREST APIs

Cloud & DevOps

AWSAzureGCPDockerKubernetesTerraformCI/CD

Questions teams ask us.

You decide per assessment. Prelim can allow, restrict, or observe copilot use — and scores the quality of the candidate's judgment either way, since that's what the job requires.

Prelim ships environments for the major languages and frameworks, and supports custom repos so candidates work in something close to your real codebase.

Integrity signals are probabilistic and reviewable. Prelim flags anomalies for a human to confirm rather than auto-rejecting, protecting legitimate candidates.

Interview only engineers who can already build.

Bring one open technical role. We'll assemble the assessment live and show you a sample skills matrix.