Domain: Engineering

Test Real Engineering
Ability, Not
Interview Performance.

Live IDE, system design challenges, and code review simulations that reveal true engineering capability — across any language, stack, or seniority level.

8M+Engineering assessments done
60+Languages in live IDE
10K+Challenge library
app.prelim.ai — assessment
// Engineering Challenge — Live IDE function mergeSort(arr) { if (arr.length <= 1) return arr; const mid = Math.floor(arr.length/2); // candidate solution evaluating... } > Tests: 8/8 passed ✓ > Complexity: O(n log n) ✓
8M+
technical assessments completed by engineering candidates in 2025
The Challenge

Move Beyond Code Trivia to Actual Engineering Ability

Great engineers solve real problems, not LeetCode puzzles. Our assessments mirror real engineering workflows — debugging, architecture decisions, code review, and system design under realistic constraints.

Enterprise insight
Platform Capabilities

Engineering Assessment Across the Full Stack

Live IDE Environment
Browser-based IDE supports 60+ languages — candidates code in their natural environment with autocomplete and execution.
System Design Challenges
Architecture and design problems assessed by AI against engineering principles — scalability, reliability, maintainability.
Code Review Simulation
Candidates review real pull requests — testing judgement on quality, security, and best practices.
Anti-Cheat by Design
Custom problems generated per session eliminate copy-paste solutions from StackOverflow or AI assistants.
Platform
Demo Hub

See It. Try It. Own It.

Three self-guided tours that show you exactly how Prelim solves your specific challenge — no sales pitch required.

⏱ 9 min guided tour
Engineering Assessment Tour
Watch a full-stack engineer complete a real-world debugging and design challenge.
⏱ 5 min guided tour
Language & Stack Configuration
Set up role-specific tests across any language, framework, or tech stack in minutes.
⏱ 4 min guided tour
Code Quality Scoring
Understand how our AI evaluates correctness, efficiency, readability, and engineering judgement.
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Domain: Data Science
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Domain: IT
Domain: IT
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Online Proctoring
Online Proctoring
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Engineering Hiring
Engineering Hiring

Engineering Assessment at the Depth Your Team Requires

Generic coding challenges don't reveal engineering excellence. Prelim's engineering assessments are built for specific disciplines — systems design, backend architecture, DevOps practices, and embedded systems — reflecting the real complexity of your technical roles.

Our live IDE and take-home project formats let you assess design thinking, code structure, and technical communication — giving you confidence in every engineering hire.

  • Role-specific tracks: backend, frontend, DevOps, embedded
  • Systems design whiteboard exercises with AI evaluation
  • Take-home projects with automated and manual review
Engineering Disciplines

Assessments Tailored to Your Engineering Stack

Discipline-specific challenges built with engineers, for engineers.

🏗️

Systems Design

Architecture diagramming and API design tasks reveal candidates who can design systems that scale — not just code features.

🔧

Backend & DevOps

Database modelling, containerisation, CI/CD, and infrastructure-as-code tasks across AWS, GCP, and Azure.

🖥️

Frontend & Full Stack

React, Vue, performance optimisation, and accessibility tasks that go beyond surface-level UI knowledge.

Engineering Assessment

Challenges Built By Engineers, For Engineers

Every task reflects the real complexity of your engineering environment.

Systems Design
Systems Design
Code Challenge
Code Challenge
DevOps Task
DevOps Task
Review Panel
Review Panel

Build Engineering Teams That Deliver

Assess technical depth, design thinking, and code quality — all before the first interview.

Explore Engineering Track Request a Demo