Hey, team!  Lately I have hit a wall, my microservices are so dominated with hardcoded rules that adjusting even the smallest nuance in policy was like disarming a bomb. I’m going to take you on my journey from messy if/else trees to clean, policy-driven microservices that update themselves (no redeploys). This will include every step from zero (no experience required) to hero, as well as some real-world examples, some questions for you to ponder and ideas you can use today. Let’s go!

What’s Wrong With Hardcoded Rules?

A Simple Example—and Why It Sucks

Let’s say you are building an e-commerce checkout service. The service needs to charge a small surcharge when customers are located in certain countries. So, you write: