Code review is hard to do right. Use multiple reviewers for critical code (treat it like proof reading an email you are about to send to millions of customers)

Code review is hard to do right. Use multiple reviewers for critical code (treat it like proof reading an email you are about to send to millions of customers). Write automated tests if you can, including for regressions and edge cases, but also to assert your code works the way you’re saying it will. Finally, check the code out locally if you’re a reviewer and verify the changes yourself, don’t just read the diffs.