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 (ES6+)

Experience with data structure libraries (e.g., Immutable.js)

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.

Ability to understand business requirements and translate them into technical requirements

A knack for benchmarking and optimization

Proficient understanding of web markup, including HTML5, CSS3

Proficient understanding of client-side scripting and JavaScript frameworks, including React.js, Next.js etc.

Strong understanding of asynchronous request handling, partial page updates, and AJAX

Basic knowledge of image authoring tools, to be able to crop, resize, or perform small adjustments on an image

Proficient understanding of cross-browser compatibility issues and ways to work around them

Familiarity with code versioning tools, such as Git

Excellent problem-solving skills