David Walsh is a web developer and software engineer. He works for Mozilla and also speaks in conferences and meetups like London AJAX, AustinJS, BrasilJS, etc.
In his blog, Walsh presents from career tips to tutorials and demos about React, Angular, Babel and ES6.
The page is maintained by the Brazilian developers William Oliveira and Allan Esquina, but has contributors from other countries.
Besides showing some tutorials and tips, John Resig also brings some news about the development world in his blog, talking about career and events.