What is code review?

Code review happens when another developer goes through your or your team's code line-by-line and provides constructive, helpful feedback. Code review saves time and effort by ensuring code quality up-front, rather than waiting until issues are discovered in production. It’s an essential part of the day-to-day lives of many professional software developers and data scientists.

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Ship high quality code

Ensure that you ship high quality and bug-free code every time.

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Catch the issues in your code early on by bringing on another pair of eyes. Don't wait until they cause problems in production.

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Reviewed by experts

Our mentors can perform security audits, review your overall architecture, or check your coding style.

Why Code Reviews are Important

The main purpose of code review is to prevent problematic code from being deployed to production. Reviews can help you catch bugs, identify missed edge cases, spot design issues, and avoid anti-patterns before they become a problem.

The second purpose of code review is to help you be a better developer. When you know that your code is going to be reviewed by another developer, you write code differently. You take the time to give methods or functions names that express what they do. You add more thorough tests. You write code that’s meant to be readable. You spend more time thinking through side effects and unintended consequences.

Code Review Checklist

If you are an experienced developer who can go through someone else's code line by line to help check their approach to a problem, here is a list of essential questions to ask yourself during this process:

  • Are there potential problems with the developer's approach? Does the approach make sense?
  • Are there any security vulnerabilities written in the code?
  • Is there a way to do this faster or better?
  • Would you want to be responsible for changes to this code? What would you do differently?
  • Does this code follow the best practices for this language/framework/library?
  • Can the code be easily maintained?

Once your comments are all set, go over them again and check:

  • Are all of your comments critical? Or did you also provide positive feedback?
  • Are your comments specific and clear? Did you give concrete examples whenever possible?
  • Are you using any words or acronyms that the developer may not understand?
  • Is there anything else that the developer might have missed?

Peer Code Review with Codementor

Reduce your team's technical debt without utilizing your developer resources. As the world's largest developer community for live mentorship, Codementor has over 12,000+ vetted developers who make it their mission to assist developer teams and individuals ship high quality code.

Code review best practices

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Our community of experienced developers are ready to review your code right when you need it. From Python, React, and Swift, to Flutter, Clojure, and Unity3D, our mentors ensure your code is in top shape before shipping.

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What happens on Codementor stays on Codementor. Sign an NDA with your mentor to make sure your code stays secure.

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How Does Code Review Work?

Post a request for review process

STEP 1

Post a code review request

Find developer peer and expert

STEP 2

Find and hire a great developer to review your code

Ship high quality code

STEP 3

Get your code reviewed and ship high quality code

Mentors Available for Code Review

Swift - Miroslav Kuťák

Miroslav Kuťák

5.0
1187 Sessions / Jobs

7+ years of professional iOS developer experience (iOS 4-12), 20+ AppStore apps, Czech Technical University

iOSSwiftObjective-C+5
HTML/CSS - Johnny B. (Ionică Bizău)

Johnny B. (Ionică Bizău)

5.0
1544 Sessions / Jobs

Hello! I am Johnny B. 🙏 (Actually, my Romanian friends call me Ionică, which in English is basically: Johnny). ...and ...

JavaScriptHTML/CSSNode.js+9
JavaScript - Jessamyn Smith

Jessamyn Smith

5.0
2992 Sessions / Jobs

I am an experienced full-stack software developer with over a decade in the field, primarily in back-end...

PythonJavaScriptHtml+17

Here’s What Our Users Say

Not sure if he is just a genius or did a pretty big code review ahead of time but he instantly knew my issue and then made sure that any follow on issues were fixed. Really helped with my C++ project. He really made sure I knew why something was wrong and the correct way of fixing it. Less fishing and more teaching to fish. Amazing mentor!
Chris Seay
Christoph explains everything very detailed and understandable for beginners. I made 2h of code review with him and I have some new things I will improve in my coding. We will definitely hear each other again.
Federico Ulfo
She is a great problem solver. I really enjoy working with Jessamyn to do code reviews and discuss things like software architecture concerns as well as best practices and ways to get bet better at git-based version control in multi-programmer environments.
Aaron Walker
Follow up offline code review. Again very helpful, very informative and a pleasure to work with. Petr manages to teach you a lot whilst also providing a thorough code review. Would highly recommend.
Rob F.
Thomas has been instrumental in my development as a web developer. In particular his knowledge of Node, front-end frameworks, and JavaScript in general, as well as a variety of web development concepts, has really helped me to rapidly build up my skills and understanding. He has been very thorough in code reviews, is quick to understand the purpose and structure of my apps, and evaluate them based on his knowledge of best-practice. I look forward to more sessions with him!
Simon Norman

Learn More About Code Reviews

Now that you understand what code reviews are, why they are important, and how to get and give good code reviews, here are a few other posts we recommend reading.

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