https://owenps.github.io/tags/amazon/Recent content in Amazon on Owen SmithHugoen-usSat, 28 Jun 2025 12:31:43 -0400https://owenps.github.io/blog/the-150-150-rule/Sat, 28 Jun 2025 12:31:43 -0400https://owenps.github.io/blog/the-150-150-rule/The “Rule” The 150-150 CR (a.k.a ‘A Code Review A Day’) Rule is a development philosophy at Amazon that helps teams ship code faster and at a higher quality. The rule is that each code review (CR) is at most 150 lines of changes to source code and 150 lines of changes to test code. The guidline recommends: Limiting total changes per CR to 150-150 lines or fewer. Submitting at least one 150-150 CR a day.