Optimize applications for maximum speed and scalability
Assure that all user input is validated before submitting to back-end services
Collaborate with other team members and stakeholders
Strong understanding of JavaScript, its quirks, and workarounds
Basic understanding of web markup, including HTML5 and CSS3
Good understanding of {{Depending on the specific case, a developer should have the knowledge of advanced JavaScript libraries and frameworks such as AngularJS, KnockoutJS, BackboneJS, ReactJS, DurandalJS etc.}}
Good understanding of asynchronous request handling, partial page updates, and AJAX
Proficient understanding of cross-browser compatibility issues and ways to work around such issues
Familiarity with JavaScript module loaders, such as Require.js and AMD
Familiarity with front-end build tools, such as Grunt and Gulp.js
Proficient understanding of code versioning tools, such as {{Git / Mercurial / SVN}}
Good understanding of browser rendering behavior and performance
