Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model « Thorough understanding of React.js and its core principles « Experience with popular React.js workflows (such as Flux or Redux) « Familiarity with newer specifications of ECMAScript « Experience with data structure libraries (e.g., Immutable.js) « Knowledge of isomorphic React is a plus « Familiarity with RESTful APIs « Knowledge of modern authorization mechanisms, such as JSON Web Token « Familiarity with modern front-end build pipelines and tools « Experience with common front-end development tools such as Babel, Webpack, NPM, etc.