Figuring Out What Matters In A Codebase

In a large codebase, the code will follow the Pareto Principle (the 80/20 rule): 20% of the components account for 80% of the impact. So your goal as the engineer is to spend most of your time on the 20% of code that matters to the business and matters to your coworkers.

How do you figure out where that 20% comes from?

• Talk to people
• Use blames to find hotspots
• Look for patterns in code re