Frontend/NodeJs Developer [ T4 Contract]

We are seeking a strong frontend engineer with proven experience of developing rich web applications to millions of users to join our Stores and Social team. You will be responsible for architecture, design and delivery of critical seller and buying facing features and use the standard methodologies in UI development. Proficient in Web/Frontend technologies and frameworks like Node.JS, HTML5, CSS3 with LESS or SASS, JavaScript, Ajax, streaming technologies . Proficient in Javascript concepts of scopes, prototype inheritance, closures, promises, async and await, shared memory etc. Experience with transpilers, package management, modules is preferable. Solid CSS3 skills including layouts, media-queries, responsive design, gradients, transitions, positioning, flex, box models, floating and block elements, inlining, preprocessors etc. Hands on frontend testing skills using frameworks such as Mocha/Chai, use of mocks/spies/stubs, visual regression like percy , code coverage and CI/CD integrations like Jenkins. Must have solid understanding of defining REST based interfaces and have a good understanding of storage technologies (relational and NoSQL) Experience building drag and drop functionality, image editing, video upload capabilities, real time streaming is desirable Proficiency with Security, Accessibility, Site Speed optimization, Cross-browser /Cross-platform UX Design is desirable