Where It All Began: 2019 re:Invent AWS CDK had just gone GA that year with TypeScript and Python support. At re:Invent 2019, I saw AWS present how to contribute to CDK for the first time. There was no AI back then — everything was manual. Clone the entire monorepo, figure out the Lerna project structure, manually build dependent packages, write L2 constructs, write tests, submit a PR. Every step was something you had to figure out on your own. I was blown away. A construct I write, a bug I fix — once it's merged, it ships with the next version of aws-cdk to the entire world. Developers everywhere use this thing every day, and I can directly change it. I thought that was incredibly cool. I later wrote a post on community.aws called Contributing to AWS CDK, documenting the entire process so others wouldn't have to figure it all out from scratch like I did. 2019–2024: The Live Contribution Walkthrough Era Over the next few years, I made a lot of live contribution walkthrough videos.…