During a PHP technical interview, I once asked a candidate about their experience with code reviews. The answer surprised me:
“I’ve been in the industry for four years. I’m not a junior, so I
don’t need code review.”
This kind of answer is a warning sign if someone wants to build a professional career as a software developer.
Why do we need code reviews so much in a team environment? Is it because we don’t trust each other? In the next few paragraphs, I’ll cover this topic in a nutshell.
When a developer creates a change request (or multiple change requests) in a codebase, other developers are asked to review it. Reviewers may find issues, suggest improvements, or propose alternative approaches related to the changes.
Once the team reaches consensus, and the unit tests run successfully, the changes can be merged into the target branch.
The primary purpose of code review is to ensure that the overall health of the codebase improves over time. In a team environment, we improve code quality together. We agree on standards and expectations, and we make sure the code meets them.
Beyond quality assurance, code review is also a mentoring process. Developers can learn from each other’s work, discover new techniques, and share knowledge. This knowledge sharing helps the whole team grow and improve day by day.
Code review is also about ownership and responsibility. By reviewing changes, you take partial responsibility for the code that goes into the system. If someone avoids reviews entirely, it often means they are unwilling to understand the broader impact of their changes.
There are many aspects to consider during a code review, including correctness, design, security, readability, maintainability, complexity, and testability. The process is a form of discussion. Disagreement is perfectly fine, as long as feedback is supported by clear reasoning.
Overall, code review fosters collaboration, reduces technical debt, and increases project reliability. One of its key benefits is early bug detection, catching issues before they reach testing or production, which saves both time and resources. Another major benefit is knowledge transfer: team members gain insight into different parts of the codebase
These informal sync-ups are highly effective ways to share ideas and context within a team. Reviewing and understanding each other’s work directly is one of the best ways to build a strong, collaborative engineering culture.
Code review isn’t about mistrust. It’s about building software — and teams — that outlast individual contributors.