Jezen Thomas

Jezen Thomas

CTO & Co-Founder at Supercede. Haskell programmer. Writing about business and software engineering. Working from anywhere.

Code Review Done Right

The common approach to code review is in my opinion a sad one — you may not contribute until you have received the stamp of approval from a project senior. It’s an oddly bureacratic process for a team of software developers to follow.

It’s the software development version of guilty until proven innocent.

Although the approach is prevalent, I don’t believe it’s the best one, or even a good one. What follows are my non-technical thoughts on conducting constructive, humane reviews of code.


Code review ought to be about sharing. It’s an effective way to show colleagues how you approach a problem. Initiating code review is a powerful catalyst for dialogue. When you submit code for review, you provide all developers involved with common ground to stand on and the context needed to engage in meaningful discussion.

If you’re not explicitly sharing an idea, you might be asking for alternatives. Good code review involves both sharing and learning, for both the committer and the reviewer. This is the value proposition of the code review. Everybody wins here.


Nobody likes having their work nitpicked, and nobody who isn’t a total jackass enjoys nitpicking work.

If a significant portion of comments in your code review process are of the more mundane variety, e.g., “you forgot to add a semicolon here”, it tells you that there is something missing in the team’s development workflow. Humans make mistakes, and our development process should allow for that. If the one thing standing between a commit and a production deploy is human discipline, you have broken software.

There’s another problem with nitpicky comments; it’s distracting. If a reviewer feels the need to double-check the amount of whitespace used, their attention is drawn away from more interesting insights, and possibly more serious problems.

This isn’t to suggest strict adherence to a style-guide isn’t important — it is. But we have tools that can catch these issues and we ought to use them. Cognitive power is too precious to waste on the mundane.


Code review involves review, not military inspection. Not all feedback needs to be critical. We are after all a team of humans, and it feels good to be told “Ah, I like the way you did that!” from time to time. This isn’t to suggest anyone should promote a culture of circle-jerking, but as a general rule people do enough good work to deserve an animated GIF of a dancing princess or something at least once per day.

It doesn’t necessarily have to be a dancing princess


Even if people consciously understand that they are not their code, and that criticisms of their work are not personal, it’s still so hard to not be sensitive towards critique. I’m not sure I do enough to accommodate people’s feelings in the review process, but I do try to differentiate the language I use when I give criticism versus when I give encouragement.

When giving criticism, nothing is the committer’s fault. If there is a problem in a commit, it’s everyone’s problem in our codebase, and it’s everyone’s responsibility to rectify.

When giving encouragement, it is the committer who receives direct praise. If you rose above and beyond the call, then you deserve the kudos.