Code reviews catch bugs, spread knowledge, and maintain code quality. Done poorly, they're a bottleneck and source of frustration. Here's how to do them well.
Why Code Review Matters
Benefits:
✓ Catch bugs before production
✓ Share knowledge across team
✓ Maintain consistent code style
✓ Mentor junior developers
✓ Document design decisions
✓ Reduce technical debt
Costs (if done poorly):
✗ Slow down development
✗ Create team friction
✗ Become rubber-stamp exercises
✗ Block urgent fixes
For Authors
Before Requesting Review
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Writing Good PR Descriptions
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Keep PRs Small
Size guidelines:
< 100 lines → Quick review (< 30 min)
100-400 lines → Standard review (30-60 min)
400-1000 lines → Large review (needs multiple sessions)
> 1000 lines → Split into smaller PRs
Large PRs get:
- Superficial reviews
- Longer wait times
- More merge conflicts
- Higher defect rates
For Reviewers
Review Process
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Giving Feedback
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Constructive Criticism
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Automation
Pre-Review Automation
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Automated Code Review
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Review Culture
Healthy Norms
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Resolving Disagreements
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Metrics
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Conclusion
Code review is a skill that improves with practice. Focus on finding real issues, giving actionable feedback, and building a culture of learning.
The goal is better code and better engineers—not perfect code or point-scoring.