Candidate should know about these technologies - "a. Previous experience working as a react.js developer. b. Writing application interface codes using JavaScript following react.js workflows. c. In-depth knowledge of JavaScript, CSS, HTML, and front-end languages. d. Knowledge of REACT tools including React.js, Webpack, Enzyme, Redux, and Flux. e. Experience with user interface design. f. Knowledge of performance testing frameworks including Mocha and Jest. g. Experience with browser-based debugging and performance testing software. h. Excellent troubleshooting skills."