- Proficient understanding of web markup, including HTML5, CSS3 - Basic understanding of server-side CSS pre-processing platforms, such as LESS and SASS - Proficient understanding of client-side scripting and JavaScript frameworks, including jQuery - Good understanding ofadvanced JavaScript libraries and frameworks, such as AngularJS, KnockoutJS, BackboneJS, ReactJS, DurandalJS etc. - Good 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. Familiarity with tools such as Gimp or Photoshop is a plus. - Proficient understanding of cross-browser compatibility issues and ways to work around them. - Proficient understanding of code versioning tools, such asGit / Mercurial / SVN - Good understanding of SEO principles and ensuring that applications will adhere to them.