Code Review Best Practices

Code review is the practice of having one or more teammates examine proposed changes before they are merged. Done well, it catches bugs early, spreads knowledge across the team, and improves code quality — but done poorly, it becomes a bottleneck or a source of friction.

Effective code review starts before the review even happens: authors should keep pull requests small and focused on a single logical change, since small PRs are faster and easier to review thoroughly, while large ones invite rubber-stamping or fatigue. A clear PR description should explain what changed and why, not just what — linking to the relevant ticket and calling out anything that needs special attention. As a reviewer, you should evaluate correctness (does the logic do what it claims, are edge cases handled), readability (can a future maintainer understand this quickly), and test coverage (are new behaviors verified by automated tests). Feedback should be constructive: phrase comments as questions or suggestions rather than commands, explain the reasoning behind a requested change, and clearly distinguish must-fix issues from optional nitpicks.

Keeping pull requests small directly improves review quality: reviewers can hold the entire change in their head, spot subtle bugs, and respond quickly, which shortens the overall feedback loop for the author. Framing feedback constructively — for example, 'What do you think about extracting this into a helper function, since it's repeated three times?' instead of 'This is wrong, fix it' — keeps the review collaborative rather than adversarial, which matters because code review touches both the code and the author's confidence. Distinguishing blocking issues from optional suggestions (often labeled 'nit:') also prevents unnecessary back-and-forth over minor style preferences.