ResponsibilitiesDevelop new user-facing featuresBuild reusable code and libraries for future useEnsure the technical feasibility of UI/UX designsOptimize applications for maximum speed and scalabilityAssure that all user input is validated before submitting to back-end servicesCollaborate with other team members and stakeholdersPartner and collaborate with the API team Skills and QualificationsStrong understanding of JavaScript, its quirks, and workaroundsBasic understanding of web markup, including HTML5 and CSS3Good understanding of advanced JavaScript libraries and frameworks such as JQuery, AngularJS, KnockoutJS, BackboneJSGood understanding of asynchronous request handling, partial page updates, and AJAXProficient understanding of cross-browser compatibility issues and ways to work around such issuesFamiliarity with JavaScript module loaders, such as Require.js and AMDFamiliarity with front-end build tools, such as Grunt and Gulp.jsProficient understanding of code versioning tools, such as {{Git / Mercurial / SVN}}Good understanding of browser rendering behavior and performance