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What could make code reviews more effective? Doing them all the time! /s

I've worked at a company that did 100% pairing as well, you'd be surprised at the productivity gains that you experience with it, depending on your work habits.

Not everyone can sit down for 8 hours a day and write code. Some number of people get distracted by Facebook, Hacker News, whatever it might be. Having a baby-sitter of sorts sitting next to you certainly keeps this kind of person on track - and I know, I'm one of them.

Of course this is not every engineer out there. Sure, some people are able to stay focused for 8 hours a day, but I'm certainly not one of them.

Highly recommended:

https://www.gerritcodereview.com/

Or (tooting my own horn) for a friendlier but still powerful approach to code reviews that integrates better with GitHub you could try https://reviewable.io.

Would this be an alternative and/or replacement to GitHub's code review features?

read through it. that is nice. thank you for sharing that! do believe am going to implement that for my team.