CODEOWNERS Best Practices for Faster Reviews

A well-structured CODEOWNERS file is the foundation of efficient code reviews. Here’s how to optimize yours for use with Octiew.

What is CODEOWNERS?

The CODEOWNERS file defines who is responsible for code in your repository. Octiew uses this file to intelligently route PRs to the right reviewers.

Basic Structure

# Frontend team owns all frontend code
/apps/frontend/ @frontend-team

# Backend team owns API code
/apps/backend/ @backend-team

# DevOps owns infrastructure
/terraform/ @devops-team

Advanced Patterns

Directory-Based Ownership

# Specific feature ownership
/apps/frontend/src/features/billing/ @billing-team
/apps/frontend/src/features/auth/ @auth-team

Extension-Based Ownership

# Database migrations
*.sql @database-team

# Configuration files
*.yaml @devops-team
*.json @devops-team

Multiple Owners

# Critical files require multiple reviewers
/apps/backend/src/auth/ @auth-team @security-team

Octiew-Specific Optimizations

1. Use Team Mentions

Instead of individual users, use team mentions for better load distribution:

# Good - Octiew randomly selects from team
/src/api/ @api-team

# Less optimal - Always assigns same person
/src/api/ @john-doe

2. Granular Ownership

More specific patterns lead to better reviewer matching:

# Specific is better
/src/components/ui/Button/ @ui-team
/src/components/ui/Form/ @forms-team

# Too broad
/src/components/ @frontend-team

3. Avoid Over-Assignment

Don’t assign too many owners to the same path:

# Good - Octiew picks one
/src/core/ @team-a @team-b

# Too many - slows down selection
/src/core/ @team-a @team-b @team-c @team-d @team-e

Testing Your CODEOWNERS

Use GitHub’s built-in validation:

# Check CODEOWNERS syntax
gh api repos/:owner/:repo/codeowners/errors

How Octiew Uses CODEOWNERS

When a PR is created, Octiew:

1. Analyzes changed files
2. Matches against CODEOWNERS patterns
3. Identifies all potential reviewers
4. Randomly selects one reviewer (for load balancing)
5. Sends Slack notification
6. Auto-reassigns if declined or timeout

Common Mistakes to Avoid

❌ No Fallback Owner

# Missing default owner
/src/feature-a/ @team-a
/src/feature-b/ @team-b
# What about other files?

✅ Always Have a Default

# Default owner for everything
* @engineering-team

# Specific overrides
/src/feature-a/ @team-a
/src/feature-b/ @team-b

❌ Inactive Users

# User left the company
/legacy/ @former-employee

✅ Keep It Updated

Regularly audit and update your CODEOWNERS file.

Get Started

Ready to optimize your code review workflow? Try Octiew today!

Have questions about CODEOWNERS? Email us at octiew@dmt.dev