Five years ago, Medium was built using the latest tools and frameworks by people who had experience with those tools. It’s time that we update these tools and frameworks. However, migrating an entire system to new tools and frameworks isn’t an easy task. And doing that while not impacting feature development? That’s even harder. So, how would you migrate off of your existing system, without hinder
![2 Fast 2 Furious: migrating Medium’s codebase without slowing down](https://cdn-ak-scissors.b.st-hatena.com/image/square/251d2180636da57589ae2a6a827344292728f82b/height=288;version=1;width=512/https%3A%2F%2Fmiro.medium.com%2Fv2%2Fresize%3Afill%3A957%3A504%2Fg%3Afp%3A0.54%3A0.15%2F1%2AhRaWh9OmvCSHE3bnfEND1Q.png)