Felix Kling

I have been writing JavaScript applications and libraries for about 12 years now. It all started with writing a Firefox extension for taking notes. Since then I continue to deepen my knowledge about the language by reading the ECMAScript specification and following the work of the TC39 committee. And I enjoy helping others with that knowledge and teach about JavaScript. I'm the #3 contributor in the JavaScript tag on Stack Overflow. I have been teaching a small course about JavaScript core concepts while working at Facebook. I have created developer tools for JavaScript around code transformation (jscodeshift) and syntax analysis (https://astexplorer.net).

I've been involved with developer tooling one way or another for quite a while. At Facebook I had created a "codemod" tool for making larger code transformations easier to handle. In parallel I had been working on https://astexplorer.net, which lets users inspect the abstract syntax tree (AST) of various parsers, including JavaScript parsers such as acorn, babel or TypeScript. It also simplifies prototyping plugins for babel and eslint. As part of my work I developed full stack applications for icon management, and developed scripts to automatically sync icons to multiple repositories and generate code to access them.

I've come into contact with React early on due to my work at Facebook. I've also used it in most of my personal side projects.

I've primarily built command line tools with Node.js (jscodeshift) but also have developed small web server applications with express.

I'm neither a designer and nor a UI guru, but knowing the foundation of HTML and CSS is essential for any web project.