Worst code I ever had to touch: a React application, createClass era, before redux was a thing, that had everything in one fucking component.

Every fucking thing.

This was a simple video chat application, but still. The component's code included:

- Views (contact list and video call screen) and logic to switch between them;
- All application state;
- API calls;
- Websocket message handling;
- WebRTC logic (getUserMedia and p2p streaming).

This app was built by one person in one month for a demo. That person left the company after the demo and I had to maintain that mess without zero React knowledge (I was doing angular at that time). On his last day he gave me a crash course and an overview of how the app worked.

Around that time I attended a few meetups and a conference with talks about React. That, my curiosity and ability to learn by refactoring helped me a lot when I had to add new features and fix bugs in that app.