CodePair

Live coding interviews in the tools engineers use every day

Beyond vibe coding, work side by side in a shared IDE, terminal, and repo so you can see how candidates debug, collaborate, use AI with judgment, and explain decisions as they build.

Start Free Trial View Pricing

IDE

Blazing Fast Performance

A fast shared IDE built for live collaboration. Smooth typing, readable multi-cursor editing, and a built-in AI agent keep the session focused on the work.

Blazing fast performance with zero input lag

Multi and single cursor with follow support

Integrated AI agent with full file and shell access

Blazing fast performance with zero input lag
Multi and single cursor with follow support
Integrated AI agent with full file and shell access

Learn more

CodePair IDE

app.js

const express = require('express');

const app = express();

app.get('/', function(req, res) {

res.send('Hello World!');

});

app.listen(3000);

Blazing Fast

AI

Integrated Coding Agent

Built-in AI coding assistant. See every prompt, response, and candidate decision as it happens, so AI use becomes part of the signal instead of a black box.

Real-time AI interactions shared with hiring managers

See how candidates use AI, validate output, and keep moving

Evaluate prompting skills and AI collaboration approach

AI can read, write, and edit code with full context

Assess candidates' problem-solving methodology with AI

Real-time AI interactions shared with hiring managers
See how candidates use AI, validate output, and keep moving
Evaluate prompting skills and AI collaboration approach
AI can read, write, and edit code with full context
Assess candidates' problem-solving methodology with AI

Learn more

AI Coding Assistant

Ready

AI Ready

AI Capabilities

• ORM optimization

• Code generation

• Performance analysis

• Best practices

Terminal

Nix-Powered Environments

Full terminal access with Nix package manager. Install from over 1 million packages instantly - from programming languages to databases, everything just works.

Full bash/zsh terminal with root access

Nix package manager with 1M+ packages

Instant environment setup with flake.nix

Multiple language runtimes (Node, Python, Go, Rust)

Database and service management (PostgreSQL, Redis)

Full bash/zsh terminal with root access
Nix package manager with 1M+ packages
Instant environment setup with flake.nix
Multiple language runtimes (Node, Python, Go, Rust)
Database and service management (PostgreSQL, Redis)

Learn more

Terminal - Nix Environment

1M+ packages

candidate@codepair:~/project$

Nix Package Manager

• 1M+ packages available

• Instant installation

• Reproducible environments

• Zero conflicts

Run

Live Applications

Build and run complete applications in real-time. See React frontends, Node.js APIs, and full-stack projects come to life with instant previews.

Automatic port detection and proxy setup

Live reload for frontend applications

Multiple concurrent services (frontend + backend)

Database connections and data persistence

Instant preview links for stakeholders

Automatic port detection and proxy setup
Live reload for frontend applications
Multiple concurrent services (frontend + backend)
Database connections and data persistence
Instant preview links for stakeholders

Learn more

Terminal - Live Applications

Auto-proxy

candidate@codepair:~/todo-app$

Running Services

Frontend :3000

API :8000

Database :5432

Live Reload

Git

Real Git Workflow

Full Git workflow integration within CodePair. Candidates work with branches, commits, and PRs just like in real development environments.

Complete Git history and branching support

Real-time commit sharing between participants

Pull request workflow simulation

Diff visualization and merge conflict resolution

Integration with GitHub/GitLab repositories

Complete Git history and branching support
Real-time commit sharing between participants
Pull request workflow simulation
Diff visualization and merge conflict resolution
Integration with GitHub/GitLab repositories

Learn more

Git Workflow

Collaborative

candidate@codepair:~/todo-app$

Git Flow

main

Team Collaboration

• Real-time commit sharing

• Shared git history

• Branch synchronization

• Conflict resolution

trusted by leading organizations worldwide

Optional AI agent, fully visible

Transparent AI use, part of the signal

Enable AI when it matches the role and stage. Interviewers can see prompts, responses, and candidate decisions in real time, so AI use becomes part of the signal instead of a blind spot.

: Real-time AI visibility: Watch candidates interact with AI and evaluate their prompting, validation, and decision-making approach
: Shared reviewer context: All AI interactions stay visible to interviewers, making the workflow reviewable instead of hidden
: Code explanation & generation: AI can explain patterns, generate code snippets, and suggest fixes with full repository context
: Optional by design: Enable or disable AI assistance based on the role, stage, and assessment goals
: Flexible model support: Use default models or connect providers from OpenAI, Anthropic, Google, Azure, DeepSeek, and more

AI Coding Assistant

AI Ready

See decision-making unfold in the repo

Evaluate collaboration and judgment live

You are not guessing based on stress performance or memory tricks. You are watching collaboration happen over live code changes with shared context, live cursors, and the same project state on both sides.

src/components/TodoApp.jsx

import ( useState ) from 'react';

function TodoApp() {

const [todos, setTodos]

= useState([]);

return (

<div>

}

Ready before the session starts

Dev environment ready before anyone joins

Nix-powered setup means languages, tools, and services are ready before the interview begins. That removes setup drift, cuts wasted time, and keeps the conversation on the work instead of the environment.

: Instant configuration: Complete environments ready in seconds with flake.nix files
: 1M+ packages: Access to the entire Nix ecosystem including languages, databases, and development tools
: Reproducible environments: Consistent, identical setups across all interviews and sessions
: No setup detours: Skip environment debugging and keep the interview on the work

flake.nix

Move from submission to live follow-up without resetting

Never lose context between steps

Move from repo-based take-homes into CodePair using the same project files and build context. No resets, no re-explaining what happened before, and no starting over on a disconnected prompt.

Terminal

candidate@interview:~/todo-app$ npm run dev

Run the app and work through tradeoffs live

Builds, previews, and debugging in one place

Run the app, inspect output, debug issues, and talk through tradeoffs in the same session. CodePair works best when the interview feels like engineering work, not theater.

: Full bash/zsh terminal: Complete command-line interface with all standard utilities
: Package management: npm, pip, cargo, go mod, and other language-specific tools
: Build tools & CI/CD: Docker, Git, testing frameworks, and deployment tools
: Database access: Direct connection to PostgreSQL, Redis, and other services

Terminal

user@codepair~/project$

Faster setup for realistic interview scenarios

Build realistic environments faster

Use AI to scaffold interview environments, sample data, and scenario variations that still reflect the work you actually hire for. Move faster on setup without falling back to generic prompts.

: Environment scaffolding: AI drafts flake.nix files, docker-compose.yml, and full-stack configurations
: Realistic sample data: Generate user profiles, database schemas, and API endpoints that make the task feel grounded and specific
: Role-calibrated scenarios: Tailor environments for junior, senior, and lead-level interviews without rebuilding from scratch
: Multi-technology support: Draft setups for React + Node.js, Python + Django, Go + PostgreSQL, and more

AI Challenge Creator

Advanced Mode

From mainstream web stacks to niche runtimes

Supports the stacks your team actually hires for

CodePair runs on Nix-powered environments, so you can interview in the languages, frameworks, and services the role actually uses. Stay close to the stack instead of bending the interview to fit the tool.

Popular Languages & Frameworks

And hundreds more supported through our Nix ecosystem

Programming Languages

JavaScript TypeScript Python Go Rust Java C#C++Swift Kotlin PHP Ruby Dart Scala Elixir Clojure Haskell R MATLAB Solidity

Frameworks & Technologies

React Vue.js Angular Svelte Next.js Nuxt.js Django FastAPI Spring Laravel Express Flutter Unity TensorFlow PyTorch

Infrastructure & Databases

Docker Kubernetes PostgreSQL MongoDB Redis GraphQL Nginx Elasticsearch

Need something else? Our Nix-powered environment system supports virtually any technology that runs on Linux. From emerging languages to legacy systems, if it exists, CodePair can run it.

Get Started in Minutes

Start Using CodePair Today

Launch CodePair from a challenge, a real repository, or Quick Create and get to the technical conversation faster.

Start Free Trial View Pricing

Live coding interviews in the tools engineers use every day

IDE

AI

Terminal

Run

Git

Optional AI agent, fully visible

Transparent AI use, part of the signal

See decision-making unfold in the repo

Evaluate collaboration and judgment live

Ready before the session starts

Dev environment ready before anyone joins

Move from submission to live follow-up without resetting

Never lose context between steps

Run the app and work through tradeoffs live

Builds, previews, and debugging in one place

Faster setup for realistic interview scenarios

Build realistic environments faster

From mainstream web stacks to niche runtimes

Supports the stacks your team actually hires for

Get Started in Minutes

Start Using CodePair Today

CodeSubmit

Support

Compare

Company

Legal